gram negative bacterial cell wall?group of answer choicescomposed of peptidoglycan and an outer membrane
Answers
The cell wall of Gram-negative bacteria is composed of peptidoglycan and an outer membrane. The peptidoglycan layer is a mesh-like structure made up of polysaccharide chains peptide crosslinks.
Here correct answer is A.
This layer acts as a barrier to protect the cell from the environment and as a scaffold for the cell to maintain its shape. The outer membrane is composed of phospholipids and lipopolysaccharides.
The lipopolysaccharides are molecules composed of a lipid head, a core oligosaccharide, and a polysaccharide tail. The lipid head anchors the molecule to the membrane and the polysaccharide tail, which is highly variable, is exposed to the environment and is responsible for most of the antigenic variation in Gram-negative bacteria.
The outer membrane provides additional protection from the environment and also acts as a permeability barrier, controlling the passage of molecules into and out of the cell. Together, the peptidoglycan and outer membrane layers form a structure that is highly effective at protecting the cell from external threats.
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Complete question is:-
gram negative bacterial cell wall?group of answer choices
a. composed of peptidoglycan and an outer membrane
b. composed of polypeptide
c. both
d. none
Related Questions
What environmental challenges do fish face living in extreme environments?
Answers
Answer: GoodMorning: )✨ What environmental challenges do fish face living in extreme environments? Overfishing. Habitat damage. Fish feed. Escapees impacting wild fish populations. Not only are they a food source for several species, but they also provide links between ecosystems through their daily migrating, feeding and resting areas. In lakes, certain fish are able to “transport and redistribute phosphorus and other essential nutrients between the shore, pelagic and deeper bottom zones.”
Hope this helps <3
Flowers are a reproductive structure for some plants. The corpse flower blooms for a short period of time, and it smells like a mixture of rotten food, decaying organisms, and garbage. This repulsive scent attracts pollinating insects to the flower.
Do you think the corpse flower’s smell meets the definition of an adaptation as stated in the video? Explain your response.?
Answers
Answer:
Yes. Because the flower blooms for only a short time, it needs to attract pollinators quickly so that it can reproduce. If it didn’t have this adaptation, the plant might not be able to produce offspring.
Explanation:
Answer from plato
Briefly summarize the literature on the broad research topic. This will likely involve including 5 or more citations that encompass the general knowledge of your research topic. - If your topic focuses on one individual or group of animal species (for examples, degus of the species Octodon degus), then you could say how, for example, much of what the species is studied for is their unique social behaviors, and then cite a few articles as examples. - If your topic instead focuses on a trait like cannibalism, you could mention how cannibalistic behaviors can be broken up further into subfields such as infanticide (cite a few examples), siblicide (cite a few examples), etc.
Answers
The literature on the broad research topic covers the study of animal species and their unique behaviors. Researchers have studied a lot on animal behavior. Social behavior, mating behavior, migration behavior, and eating behavior of animals are some of the areas that have been extensively studied over the years.
Some of the literature on animal behavior includes the following:The social behavior of DegusThe study of the social behavior of Degus is extensive, and it has been done to understand the unique social structure of the species. Research has shown that Degus have a strict social hierarchy, and they have dominant and submissive individuals in their groups. According to (Novakova et al., 2020), Degus are highly social and live in colonies. The study also revealed that Degus form stable groups that have several social bonds.Infanticide behaviors in CannibalismCannibalism is a trait that is exhibited by various animal species.
Infanticide is one of the forms of cannibalistic behavior that has been extensively studied. According to (Brinkman et al., 2017), Infanticide behavior is exhibited by a range of animal species. It involves the killing of young ones by adults, and it is mostly done by males. The study also revealed that infanticide behavior is often triggered by a lack of resources and competition between males.Courtship behaviors in MatingAnimals exhibit a range of behaviors when it comes to mating.
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Which are correct examples of physical (p) , chemical (c) , and biological (b) Barreirs?
Answers
The correct examples of physical (p) , chemical (c) , and biological (b) Barriers are coughing, saliva, and complement system.
What are physical, chemical, and biological Barriers?Physical barriers encompass tangible constructions that impede the ingress of pathogens into the body. Instances of physical barriers encompass the integumentary system, mucous membranes, and the caustic properties of gastric acid.
Chemical barriers denote substances that exterminate or impede the proliferation of pathogens. Illustrations of chemical barriers encompass saliva, tears, and perspiration.
Biological barriers encompass the body's innate immune system. This intricate defense mechanism encompasses cells, proteins, and tissues that synergistically combat infections.
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Complete question:
Which are correct examples of physical (P), chemical (C), and biological (B) barriers?
P: complement system; C: saliva; B: coughing
P: coughing; C: saliva; B: complement system
P: coughing; C: sneezing; B: complement system
P: complement system; C: saliva; B: sneezing
Winnie, Daud and Parvin collected a total of 9000
stickers.Winnie collected 3274 stickers.She collected 931
fewer stickers than Daud.
a.How many stickers did Daud collect?
b.How many stickers did Parvin collect?
Answers
ANSWER:
a.) 4, 205 stickers
b.) 1, 521 stickers
What is the systematific name of maize
Answers
Answer:
Zea mays subsp.
Explanation:
Tbh I looked it up
After you centrifuge your sample for the final time, where is your salmon DNA? a. It has completely disintegrated b. In the supernatant c. In the bottom of the tube d. It has been removed.
Answers
After you centrifuge your sample for the final time, your salmon DNA will be in the bottom of the tubeIn the bottom of the tube. (C)
Centrifugation is a process that separates particles of different sizes or densities by spinning them at high speeds in a centrifuge. During this process, the heavier particles will settle to the bottom of the tube, while the lighter particles will remain in the supernatant, or the liquid above the settled particles.
DNA is a relatively heavy molecule, so it will settle to the bottom of the tube during centrifugation. Therefore, after you centrifuge your sample for the final time, your salmon DNA will be in the bottom of the tube.
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What positions do the sun, moon, and earth have to be in for the moon to be in the “new moon” phase?
Answers
Answer:
When the Moon is between the Earth and the Sun, the bright side of the Moon is facing away from the Earth, and we have a New Moon (position A in the diagram below). The New Moon rises at sunrise, transits the meridian at noon and sets at sunset. The New Moon phase repeats every 29.531 days – one synodic month.
Which letters indicates the structures that increases the surface of absorptive epithelial cells?
Answers
The structures that increase the surface of absorptive epithelial cells are microvilli. Microvilli, sometimes known as brush borders, are tiny, hair-like protrusions found on the apical surface of specific epithelial cells.
Microvilli are approximately 1-2 μm in length and 0.1 μm in diameter, and they cover the entire free surface of a cell. The purpose of microvilli is to increase the surface area of absorptive epithelial cells, allowing them to better absorb nutrients from the surrounding environment.
Microvilli are located in the small intestine and are the distinguishing feature of the absorptive cells that line it. They also cover the surface of several other cell types, including kidney proximal tubule cells, oviduct cells, and cochlear hair cells. Thus, these structures increase the absorptive surface of the epithelial cells, and the surface area is directly proportional to the amount of absorption taking place.
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What do you do when you have abdominal pains?
Answers
Answer:
Use ginger, drink tea, chew peppermint gum, or simply use a heating pad.
A block of wood has a mass of 120 g
and a volume of 200 cm3. What is the density of
the wood?
Answers
Answer:
0.6 cm3
Explanation:
D=mass/volume
D=120g/200 cm3
D=0.6 cm3
An invasive fish species feeds on suspended plankton and algae in water. Within its five-year lifespan a single fish produces about 5 million eggs, 100,000 of which reach adulthood. How can the introduction of the invasive fish species affect the aquatic ecosystem?
Answers
Answer: due to it's inasive nature it will widespread over the larger area and feeds on planktons and algae of that area which leads to decrease in numbers of their species
Explanation:
what kind of mutation does this image represent
Answers
Answer:
A. Deletion
Explanation:
The kind of mutation that this image represent is deletion. The correct option is A.
What is mutation?A variation in the usual DNA sequence at a specific gene locus. Although the term has a negative connotation, mutations (including polymorphisms) can have a negative, positive, or neutral effect on cell function.
Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
Germline mutations (those found in eggs and sperm) can be passed on to offspring, whereas somatic mutations cannot.
In genomics, a deletion is a type of mutation that involves the removal of one or more nucleotides from a segment of DNA. A deletion can result in the loss of any number of nucleotides, ranging from a single nucleotide to an entire chromosome.
Thus, the correct option is A.
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Your question seems incomplete, the missing part is attached below as image:
the brains of people who suffer from depression tend to have low levels of
Answers
Answer:
they have lower levels of the neurotransmitter serotonin
which of the following is not a possible effect of increasing carbon dioxide levels in the atmosphere?
Answers
The statement "Cutting down forests is not a possible effect of increasing carbon dioxide levels in the atmosphere" is not a possible effect of increasing carbon dioxide levels in the atmosphere
What is carbon dioxide?One composition that dwells in our surroundings is carbon dioxide known for its transparency and absence of scent. A range of sources give rise to its presence – from human activities like burning fossil fuels (coal, oil, natural gas) to biological processes involving animal respiration to organic waste deterioration.
Interestingly enough, carbon dioxide has properties that make it function as a greenhouse gas capable of harnessing warmth within our closing atmosphere making it possible for Earth’s temperature levels to increase momentarily if not contained.
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Complete question:
Which of the following is not a possible effect of increasing carbon dioxide levels in the atmosphere?
A.) increase in water contamination and floods.
B.) ocean acidification.
C.) cutting down forests.
D.) reduction of cold-related deaths.
What are the flattened membranes in chloroplasts called?
O A. Stroma
OB. Thylakoids
C. Photosystems
D. Photons
Answers
Answer:
Thylakoids
Explanation:
OB. thylakoids
An organelle that takes in sunlight energy, carbon dioxide, and water to make food for plants
a. Cell membrane
C. cell wall
b. Mitochondria
d. chloroplast
Answers
what would happen if the abiotic matter in the environment was not recycled
Answers
Answer:
It would have drastic effect
Explanation:
It would have extreme affects to many organisms by an example:
let's say this plant needs to be in low temperatures and thanks to global warming most likely this plant won't be alive any more
credits to:socratic.org for a longer explanation just in case ;)
hopefully this helps
How are alleles and traits related?
Answers
Genes are DNA fragments and code for characteristics. There are different forms of one gene, which are the alleles. Each allele codes for a trait. C) Alleles are distinct versions of genes, and they code for traits, which are distinct forms of characteristics.
What are genes and alleles?
Genes are the hereditable DNA fragments that transmit the information needed to specify traits. This information passes from parents to offspring, generation to generation.
Genes are physically placed and arranged in the chromosomes. Each chromosome contains too many genes that might vary in length.
Alleles are the variants of the same gene. They code for the same feature but different trait. For instance, one diallelic gene might code for coat color. One of the alleles codes for black color, while the other allele codes for brown color. Both alleles determine color, but express different color.
So, to answer the question, alleles code for different traits.
Option C is correct.
Alleles are distinct versions of genes, and they code for traits, which are distinct forms of characteristics.
In our example,
Characteristic: coat colorTraits: Black coat and brown coat.One diallelic gene codes for coat color.Dominant allele (one version of the gene) codes for blackRecessive allele (another version of the gene) codes for brown
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A segment of DNA has one stand with the sequence base as
TCGCGTATCGTT, what would be the complementary stand
of DNA?
Answers
Answer:
AGCGATAGCAA
Explanation:
Adenine → Thymine (A → T)
Thymine → Adenine (T → A)
Cytosine → Guanine (C → G)
Guanine → Cytosine (G → C)
With that being said, you just switch the letters up to get the correct answer. Does this make sense? You're just switching the letters.
What is the main role of the pigment molecules within the antenna or light-harvesting complex?.
Answers
The main role of the pigment molecules within the antenna or light-harvesting complex is to collect light energy from the sun and transfer it to reaction centers
What is pigment molecules in light-harvesting complex ?A molecule with a colour and the ability to absorb light is referred to as a pigment. The many pigments found in plants are what create the different shades of colour. Of course, there are a lot of organic light-absorbing molecules in flowers and fruits. A variety of colours are also present in the leaves, stems, and roots.
In light-limited situations, the Light-Harvesting Complex II (LHCII) is primarily in charge of light absorption and excitation energy transfer, while in high light, it takes role in photoprotection. The broad consensus is that LHCII can alter its function by varying its conformation.Special pigments in photosynthetic cells absorb light energy. Different visible light wavelengths cause different pigments to react. The principal pigment in photosynthesis, chlorophyll, reflects green light and significantly absorbs red and blue light.Learn more about Pigment molecules here:
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α-strands and the β-helices are the two most common forms of secondary protein structure.(True/False)
Answers
True. Alpha-strands and beta-helices are two of the most common forms of secondary protein structure.
Secondary structure refers to the local, repeating, and stable pattern of the polypeptide chain in a protein. Alpha-strands are linear regions of the protein that are aligned parallel to each other and held together by hydrogen bonds between the backbone amide groups. Beta-helices, on the other hand, are coiled structures that are stabilized by hydrogen bonds between the backbone amide groups and the peptide bonds.
Both alpha-strands and beta-helices provide important structural stability and rigidity to the protein, allowing it to maintain its three-dimensional shape and function properly. The secondary structure of a protein is a critical determinant of its overall tertiary structure, which is the final three-dimensional conformation of the protein that determines its function.
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You are viewing an organ of the respiratory system and note the following tissues: folded mucosal layer containing simple cuboidal epithelium and smooth muscle, shifting into simple squamous epithelia. Identify the organ.
Answers
Answer:
Respiratory bronchiole
Explanation:
The respiratory bronchioles represent the narrowest airways within the lung, being continuations of terminal bronchioles that have approx. 0.5 mm in size. The epithelium of the respiratory bronchiole is composed of cuboidal ciliated cells and a small number of non-ciliated (secretory) Clara cells. The respiratory bronchioles lead into alveolar ducts composed of smooth muscle and connective tissue (i.e., elastin and collagen), connecting the respiratory bronchioles to the alveolar sacs.
Red hair may have evolved in Neanderthals and then was introduced into human populations via interbreeding. If this is true, this would be an example of
A. gene flow.
B. genetic drift.
C. the founder effect.
D. natural selection.
E. gene pooling.
Answers
what are some of the services that a healthy biodiversity provides for everyone?
Answers
Answer:
it gives a greater variety of crops
subject is science
Please help me with this
Answers
Answer:
1st is form a hypothesis. that's all I know. Sorry.
Explanation:
Traits acquired during an organisms lifetime can be passed down to its offspring true or false
Answers
Answer:
False
Explanation:
An acquired trait is the character developed in an individual as a result of environmental influence. These traits are not coded by the DNA of a living organism and therefore cannot be passed on to future generations.
What eats a parrotfish? Does a great white shark count♂️
Answers
Answer:
Shark eats a parrotfish. No but help to maintain the populations of the next-biggest predators in the food chain.
Explanation:
Place the following structure in order from largest to smallest:
A. Bronchi, terminal bronchioles, respiratory bronchioles, bronchioles, alveoli
B. Bronchi, bronchioles, terminal bronchioles, respiratory bronchioles, alveoli
C. Bronchi, bronchioles, terminal bronchioles, alveoli, respiratory bronchioles
D. Bronchioles, bronchi, terminal bronchioles, respiratory bronchioles, alveoli
Answers
The correct order of the structures from largest to smallest is bronchi, bronchioles, terminal bronchioles, respiratory bronchioles, alveoli (Option B).
Bronchi is the largest air passages that branch off from the trachea (windpipe) into the lungs. Bronchioles is smaller branches of the bronchi that continue to divide within the lungs. Terminal bronchioles is the smallest bronchioles at the end of the bronchiole tree. Respiratory bronchioles, even smaller airways that extend from the terminal bronchioles and lead to the alveoli. Alveoli is the tiny air sacs at the end of the respiratory bronchioles where gas exchange occurs.
Thua, the correct option is B.
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How is glucose used to make other molecules needed by an organism?
Answers
Answer:
Glucose is one of the primary molecules which serve as energy sources for plants and animals. ... When oxidized in the body in the process called metabolism, glucose produces carbon dioxide, water, and some nitrogen compounds and in the process provides energy which can be used by the cells.
Explanation: