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Directions: Select ALL the correct answers.
All living things contain carbon. Which of the following statements are true about carbon atoms?
A single molecule of some compounds can contain thousands of carbon atoms.
Each carbon atom can form single bonds with up to four other carbon atoms.
Carbon atoms can join together to form chains or rings.
Each carbon atom can form double bonds with up to two other carbon atoms.
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Answers
Answer:B, C and D
Explanation:
A single molecule of some compounds can contain thousands of carbon atoms. Each carbon atom can form single bonds with up to four other carbon atoms. Thus, all of the given statements are true.
What are the properties of carbon atom?Carbon is found in almost all the biomolecules and majority of compounds present in the atmosphere. All the living things contain carbon in the form of different biomolecules. A single molecule of some compounds can contain up to thousands of carbon atoms including polymers which make up the cell wall and cell membrane.
Each carbon atom can form single bonds with up to four other carbon atoms. This is due to the valency of carbon which is four, thus it can form covalent bonds with other atoms or elements. This property of Carbon is known as tetravalency. Carbon has the ability to form long chains when it gets linked with other carbon atoms.
Each carbon atom can form double bonds with up to two other carbon atoms or more.
Therefore, all these statements are true.
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Related Questions
Using chromosomal analysis, a biologist working on a prototype can count and examine an individual's chromosomes. This technique helps a biologist to
a
compare physical similarities between fraternal twins.
b
predict the number of possible variations of a gene.
c
detect an unusually large amount of extra genetic material.
d
identify the total number of gene defects in an individual.
Answers
Which development plan would cause the least harm to the existing forest ecosystem?
A. Spread the houses out evenly so that there is as much forest as possible between each of the houses
B. Place the houses close together and use the remaining forest as a natural common area
C. Build some big houses on large lots and some small houses on small lots so that families with different incomes can live together
D. Build several small clusters of homes in different places so that each house will have a few close neighbors
Answers
Answer:
B. Place the houses close together and use the remaining forest as a natural common area.
Explanation:
Placing the houses close together and use the remaining forest as a natural area is the development plan that would cause little harm to the existing forest ecosystem because less area of forest will be disturbed and the remaining forest is protected from the harm. This type of development is good for both people and organisms present in the ecosystem due to little damaged of their habitat and these organisms can't be extinct from that area.
A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea. Which of the following would be a good practice to isolate thisorganism?
a.Incubate the isolation medium adjacent to a bright full-spectrum light.
b.Incubate the isolation medium at about 90°C.
c.Use an anaerobic medium and incubate in a sealed container.
d.Adjust the pH of the medium to below 5.
Answers
The best option to isolate the archaea in this case would be to use an anaerobic medium and incubate it in a sealed container. This is because archaea are known to thrive in anaerobic environments and may not survive in the presence of oxygen.
By creating a sealed environment, oxygen will be eliminated, allowing the archaea to grow and flourish. Additionally, the use of an anaerobic medium provides the necessary nutrients for the archaea to grow and multiply.
The other options such as adjusting the pH or using a high temperature would not be suitable as it may kill the archaea or prevent their growth. Therefore, using an anaerobic medium and incubating it in a sealed container would provide the ideal environment to isolate this never-before-seen type of gingival infection.
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arthropods have a steady growth pattern growing bigger over time. group of answer choices true false
Answers
The statement that arthropods have a steady growth pattern growing bigger over time is false.
Arthropods are the organisms with bilaterally symmetrical body and their body possesses an external skeleton. The prominent examples of arthropods are insects, crabs, spiders etc. Arthropods generally grow by forming new segments near the tail, or the posterior end. Arthropods generally shed their exoskeletons periodically by the process called as molting. Since the exoskeleton is a hard structure and its outer layer is non-living or dead, it cannot grow larger in size by small increments as seen in the human skeleton. There are basically four distinct stages in the life cycle of the arthropods which are classified as egg, larva, pupa, and adult.
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The technique used for DNA amplification is:
Select one:
a. Polymerase chain reaction b. PRIMER 3
c. BLAST
d. Gel electrophoresis
Answers
a. Polymerase chain reaction (PCR) is the technique used for DNA amplification. PCR is a method used to amplify a specific DNA sequence, generating millions or billions of copies of that sequence.
This technique involves the use of DNA polymerase enzyme, primers, and nucleotides to selectively amplify the DNA of interest through a series of heating and cooling cycles.
The technique of DNA amplification refers to the process of making multiple copies of a specific DNA sequence, which can then be analyzed and studied in various ways. Polymerase chain reaction (PCR) is the most commonly used method for DNA amplification. PCR involves using a special type of enzyme called a DNA polymerase to repeatedly replicate a specific DNA sequence in a test tube. The process involves repeated cycles of heating and cooling the reaction mixture to allow the DNA strands to separate and then rejoin with the primers and the DNA polymerase to form new copies. This results in an exponential increase in the number of copies of the targeted DNA sequence, which can then be detected and analyzed using various techniques such as gel electrophoresis, DNA sequencing, and hybridization. PCR has revolutionized many areas of molecular biology and genetics research, as it allows for the rapid and accurate amplification of specific DNA fragments, even from very small amounts of starting material.
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3. Why were germinating seeds used instead of dormant (non-
germinating) seeds?
Answers
Answer:
An important function of seed dormancy is delayed germination, which allows dispersal and prevents simultaneous germination of all seeds. ... Many species of plants have seeds that delay germination for many months or years, and some seeds can remain in the soil seed bank for more than 50 years before germination.
Which of these are the traits of mammals? Select all that apply.
bony exoskeleton
cool down
diaphragm
intelligence
cartilage skeleton
milk
Answers
The traits of mammals are:
DiaphragmMilkWhat are some traits of mammal?Diaphragm: A diaphragm is a muscle that separates the chest cavity from the abdominal cavity in mammals. This muscle is essential for breathing, as it contracts and expands to create negative pressure in the lungs, allowing mammals to inhale and exhale.
Milk: Mammals are unique in that they produce milk to feed their young. Milk is produced by specialized glands called mammary glands, which are present in all female mammals. Milk provides young mammals with essential nutrients such as proteins, fats, and sugars, and helps to strengthen their immune systems.
Therefore, the options "bony exoskeleton", "cool down", "intelligence", and "cartilage skeleton" are not traits of mammals.
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living organisms use energy from the metabolism of food to create an energy-rich molecule called adenosine triphosphate (atp). the atp acts as an energy source for a variety of reactions that the living organism must carry out to survive. atp provides energy through its hydrolysis, which can be symbolized as follows:
Answers
Answer:
yeaa
Explanation:
nonoonno
Which occurs during both DNA replication and protein production?
RNA leaves the nucleus.
DNA leaves the nucleus.
RNA unzips.
DNA unzips.
Answers
Answer: RNA leaves the nucleus
Explanation: I did the assigment and got it right
1. RNA leaves the nucleus during both DNA replication and protein production.
What is DNA replication?
"DNA replication is the process by which the genome's DNA is copied in cells. Before a cell divides, it must first copy (or replicate) its entire genome so that each resulting daughter cell ends up with its own complete genome."
What are the main steps involved in DNA replication?
The main steps involved in DNA replication are as follows:
Replication Fork Formation.Primer Binding.Elongation.Termination.What is protein production?
"Protein production is the process in which cells make proteins. It occurs in two stages: transcription and translation. Transcription is the transfer of genetic instructions in DNA to mRNA in the nucleus."
What are the main steps of protein production?
Protein production includes three steps:
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what macromolecule are in potatoes
Answers
Answer:
I believe the answer is starch
Answer:
Starch
Explanation:
Potatoes are made up of starch (a complex sugar). Complex carbohydrates are called polysaccharides (poly means “many”). So plants store their energy as the complex carbohydrate called starch.
Please help!
In Florida, mangrove trees grow as part of an intertidal ecosystem. A simplified model of a food web in a Florida mangrove forest is shown.
Which of the following claims about population size in the community is best supported using evidence from the food web?
A. Phytoplankton have the largest population size because light is an unlimited resource, so there is little competition with mangroves for light.
B. Mangroves have the largest population size because trees are closer to the source of light than are phytoplankton.
C. Prawns have the largest population size because there is no competition for phytoplankton in the community.
D. Herons and pelicans have the largest population size because they are top predators in the community.
Answers
A. Phytoplankton have the largest population size because light is an unlimited resource, so there is little competition with mangroves for light.
In a food web, the primary producers, such as phytoplankton, typically have the largest population size as they are the base of the food chain. They are autotrophs that convert sunlight into energy through photosynthesis. While mangrove trees also photosynthesize, their role in the food web is different, and their population size is usually smaller than that of phytoplankton. As phytoplankton are abundant in the water, they have access to sunlight without directly competing with mangroves for light.
Human blood contains many cells and nondissolved particles. Because of this, blood is considered to be a
a. suspension
b. solution
c. mixture
d. a and c
e. all of these
Answers
Answer:
e. All of these
Explanation:
blood is suspension, mixture and even a solution
Lichens breaking down rock into
usable soil occurs in which
type of
succession?
A. primary
B. aquatic
C. tertiary
Answers
Answer:
A. Primary
Explanation:
When lichens die, they decompose, adding small amounts of organic matter to the rock to make soil.
The statement that Congress passed a tax bill and two months later a recession began, so the bill must have been poor policy is an example of _____.
Answers
The statement that Congress passed a tax bill and two months later a recession began, so the bill must have been poor policy is an example of a post hoc fallacy.
The blank is filled with "post hoc fallacy." The post hoc fallacy, also known as "post hoc ergo propter hoc" (Latin for "after this, therefore because of this"), is a logical fallacy that assumes that because one event follows another, the first event must have caused the second event.
In this case, the statement assumes that the tax bill caused the recession simply because the recession occurred after the bill was passed.
However, there could be other factors at play that caused the recession, and it is a hasty and unsupported conclusion to attribute the recession solely to the tax bill without considering other variables and evidence.
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What kind of organisms are rotifers?
multicellular
vertebrates
photosynthetic
unicellular
Answers
Answer:
Multicellular
Explanation:
they live in fresh water ponds and feeds off of some single cellular bacteria and organism.
What are insectivorous plants? Explain by giving examples.
Answers
Answer:
Insectivorous plants are plants that get their nutrients from eating or digesting bugs
Explanation: Venus fly traps, Drosera capensis, round leaved sundew,etc.
Which scenario correctly describes an interaction between the geosphere, hydrosphere, and atmosphere? A. a volcanic eruption produces carbon dioxide gas which is absorbed by an ocean.
B. Plants are eaten by primary consumers and converted to cellular energy through the process of cellular respiration.
C.Plants use water, carbon dioxide, and the energy from the sun to carry out the process of photosynthesis.
D.Ash from a volcanic eruption eventually settles into a layer in the Arctic where it is covered by new snowfall and is incorporated into a glacier.
Answers
Answer:
C. Plants use water, carbon dioxide, and the energy from the sun to carry out the process of photosynthesis.
Explanation:
In this scenario, the geosphere is represented by the plants, which are rooted in the Earth's surface. The hydrosphere is represented by the water that the plants use, and the atmosphere is represented by the carbon dioxide that the plants take in through photosynthesis. This interaction involves the exchange of matter and energy between the three spheres, with the plants using water, carbon dioxide, and sunlight to produce energy and oxygen.
Every nation has something to develop for the world's benefit. True False
Answers
Answer:
True, All nations are capable of benefitting the world
Explanation:
Every country be it developed, developing or underdeveloped has difference resources, ideologies and cultures. Benefitting the world in terms of only fulfilling the materialistic requirement of the world is not essential, a nation can also benefit the world from its ideologies, life style, etc.
For instance, countries like Bhutan have spread their thought of making everyone life happy, countries like India, and south East Asian countries are emerging producers, etc.
what is MKS system?
Answers
Answer:
MKS system is the system of measurement in which length is measured in meter(m), mass in kilogram(kg) and time in second(s)
In which major ways is the global climate changing? How does this...
In which major ways is the global climate changing? How does this compare to the phenomenon of global warming?
What is the greenhouse effect for Earth? Explain its relationship to current global warming.
Describe at least 3 predicted long-term (at least through the 21st Century) effects of climate change. Include at least on biological effect.
For carbon dioxide emissions, how did emissions of this gas change over time (2002-2016) as well as among the top-emitting nations?
Answers
The major ways in which the global climate is changing include rising temperatures, melting ice and glaciers, sea-level rise, and changing precipitation patterns. Global warming refers specifically to the long-term increase in Earth's average surface temperature, which is one aspect of the broader climate change phenomenon.
Climate change and global warming: Climate change refers to the long-term alteration of temperature and typical weather patterns in a place. Global warming refers to the Earth’s increasing surface temperature, which is mainly attributed to the increasing concentrations of greenhouse gases, particularly carbon dioxide (CO2), in the atmosphere.
Ways the global climate is changing:
Major changes in the global climate are as follows:Changes in temperature: Temperature has increased on average across the globe.Over time, oceans have become warmer.Oceans have become more acidic.Sea levels have risen.The frequency of heavy precipitation has increased. Heat waves have become more frequent and extreme.These changes are linked to global warming which is a result of the greenhouse effect.
The increase in the amount of greenhouse gases such as carbon dioxide and methane that have entered the atmosphere due to human activities is the main cause of global warming. These gases trap heat from the sun and increase the Earth's temperature. As a result, the temperature of the Earth continues to rise.
Predicted long-term effects of climate change
There are three predicted long-term effects of climate change.
They are Rising sea levels: Warmer temperatures are causing glaciers to melt at a faster rate, leading to rising sea levels. This threatens the survival of many species that live near coastlines.Increased frequency of droughts: Due to the warming of the atmosphere, the frequency of droughts and dry spells is expected to increase. This will have devastating effects on agricultural production and the ecosystems of affected areas.Shifts in biological systems: Changes in temperature and weather patterns are expected to alter the distribution, abundance, and seasonal activities of many species. These changes will lead to changes in the food chain and possible extinctions.Carbon dioxide emissions from top-emitting nationsCarbon dioxide emissions from the top-emitting nations have increased from 2002-2016. China's carbon dioxide emissions have increased the most, followed by the US, India, and Russia.
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Elliptical galaxy, the Milky Way, irregular galaxy
Answers
Elliptical galaxy, the Milky Way and irregular galaxy are the three types of galaxies.
What are galaxies?Astronomers classify galaxies into three categories: elliptical, spiral and irregular. The galaxies span a wide range of sizes, from dwarf galaxies containing as few as 100 million stars to giant galaxies with more than trillion stars.
Milky Way is a huge collection of stars, dust and gas. It's called as spiral galaxy because if you view it from the top or bottom, it would look like a spinning pinwheel.
Galaxies have different shapes as some are spiral galaxies, like the Milky Way. whereas some are egg-shaped elliptical galaxies, and the rest are called irregular galaxies. Spiral galaxies have arms shaped like 'S' spiraling out from their glowing centers.
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Note: The question given on the portal is incomplete. Here is the complete question.
Question: Elliptical galaxy, the Milky Way, irregular galaxy are -----?
An animal lives in century national park, and park rangers want to move it to independence national park. how should the new habitat compare with the current habitat in order for the animal to live there?
a. biotic and abiotic factors in both parks can be different.
b. abiotic factors in both parks should be similar, while biotic factors can be different.
c. biotic factors in both parks should be similar, while abiotic factors can be different.
d. biotic and abiotic factors in both parks should be similar
Answers
For the animal to successfully adapt to its new habitat in Independence National Park, both biotic and abiotic factors in both parks should be similar (D).
This means that the animal should be moved to a habitat that has similar temperatures, precipitation levels, soil type, light conditions, and other abiotic factors to its current habitat in Century National Park. Additionally, the new habitat should have similar food sources, predators, and other animals that the animal interacts with in its current habitat.
If the new habitat is significantly different from the current habitat, the animal may have difficulty adapting and surviving, which can lead to population declines and even extinction. By carefully considering both biotic and abiotic factors, park rangers can ensure that the animal is moved to a new habitat that is as similar as possible to its current habitat, which will increase the chances of its survival and success in its new home.
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Explain what a longshore current is.
Answers
Answer:
A longshore current is when the wave reaches the coastline and release bursts of energy.An which it can run parallel to the shoreline.
Explanation:
The National Climatic Data Center (NCDC) in Asheville, North Carolina is the world's largest active archive of weather data.
According to the NCDC, each of the years from 1997-2009 represent the warmest global temperatures on record, dating back to
1880. Which of these would represent a biased conclusion based on this data?
A)
the data only dates back to the 1880's
B)
the average global temperature for 2007 as 58.00 °F
C)
the warmest year on record was 2005 and the coolest was 1911
D)
the automobile industry is solely to blame for the increase in global
temperatures
Answers
Answer:
D) the automobile industry is solely to blame for the increase in global
temperatures
Explanation:
that is based because many things cause global warming, not just the exhaust from cars.
Which of these are gametes? (Select all that apply.)
zygote
spore
sperm
egg
Answers
Answer:
sperm and egg
Explanation:
Gametes are the reproductive or germinal cells of an organism. The sperms produced by the males and the egg produced by the females are an example of gametes. Thus, options c and d are correct.
What are gametes?Gametes are the structures of reproduction that can be called the reproductive cells of the animal or the plant species. The gamete produced by a male is sperm, while that produced by a female is an egg or an ovum.
The spores differ from gametes as they are agents of asexual reproduction and are produced by bacteria, algae, and fungi. Whereas the zygotes are the fertilized cell by the male and the female gamete.
Therefore, the sperms and the eggs are the gametes.
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Question 1 of 10
Nucleic acids and carbohydrates are both types of what?
A. Proteins
B. Macromolecules
C. Atoms
D. Elements
SUBMIT
Answers
Answer:
the answer is B: macromolecules
:)
Explanation:
one of the traits studied by mendel was plant height with two variations tall pea plants (dominants), and dwarf plants (recessive). if a true-breeding tall pea plant is crossed with a true-breeding dwarf pea plant what will the offspring look like?
Answers
The offspring will look like "tt" if a true breeding tall pea plant is crossed with a true-breeding dwarf pea plant.
Tall plants are predominant regarding bantam or dwarf plants. Tall plants formed due to breeding of only tall attributes. Assuming the quality for this characteristic is meant by the letter "T"
i.e Let the predominant qualities for Tall pea plants be T
Let the attributes for the dwarf pea plants be t
To decide the genotype of the bantam pea plant, where the dwarf attributes will be communicated:
We need to cross the Tt × Tt
T
T Tt
t tt
We got offsprings as ( TT, Tt, Tt, tt )
TT = Predominant tall pea plant
2 Tt = Two heterozygous tall pea plant.
tt = dwarf pea plant.
Hence, offspring will look like "tt".
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Fill in the blanks with amino acids names
A gene contains a mutation in which a cytosine nucleotide (C) has bee replaced by an adenine nucleotide (A)
This mutation leads to the production of a dysfunctional protein, because a (BLANK) amino acid has been replaced by a (BLANK) amino acid.
Answers
Missense mutations replace a base by another one, leading the codon to codify for another amino acid, aletirng the protein's function. This mutation leads to the production of a dysfunctional protein, because a Cysteine amino acid has been replaced by a Phenylalanine amino acid.
What is a missense mutation?When a change occurs in a codon affecting a single base pair, it is known as a point mutation.
Points mutations might be either silent, missense, or nonsense.
A missense mutation is the point mutation that changes a DNA base by another one, and causes the mRNA codon to code for a different amino acid.
The mutation that replaces a single base for another one might have different consequences concerning the substitution site and changes in the physical structure of the protein.
For instance, if the substitution occurs near the protein active site, the polypeptide function might be severely affected.
In the exposed example, a cytosine nucleotide (C) has bee replaced by an adenine nucleotide (A).
Original sequence → ATG TTA AGG ACG GAT mRNA → UAC AAU UCC UGC CUA Protein → Tyr Asn Ser Cys LeuMutated sequence → ATG TTA AGG AAG GAT mRNA → UAC AAU UCC UUC CUA Protein → Tyr Asn Ser Phe Leu
This mutation leads to the production of a dysfunctional protein, because a Cysteine amino acid has been replaced by a Phenylalanine amino acid.
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The scientific method begins with the observation of ____________ , or natural events.
Answers
The scientific method begins with the observation of phenomena , or natural events
Larger in plant cells
Answers
The answer might be vaculoe which is larger than animal cell and takes most place in the plant cell