If a woman has had a intercourse, and she missed a menstrual period by more than 14 days, she probably is pregnant. True or False
Answers
Answer:
true
Explanation:
Answer:
True.
Explanation:
Periods can come late, but even so, if the woman is an adult and has mostly predicable and a regular schedule that can be tracked, then the period could be late for at least 7-9 days MAX. 14 days would be pushing it.
Related Questions
the cell membrane is also called the plasma membrane and is made of a phospholipid
Answers
A "phospholipid bilayer" makes up the cell membrane, also known as the plasma membrane.
What is the purpose of the phospholipid bilayer?The phospholipids have two hydrophobic tails that repel water and a hydrophilic head that attracts water.
A phospholipid's head is made up of an alcohol and a phosphate group, and its tails are made up of chains containing fatty acids.Glycerol, two fatty tails, as well as a phosphate-linked direct positive make up phospholipids, which are lipids. Phospholipid bilayer, or two phospholipid layers with the tails pointing inward, is the typical configuration found in biological membranes.Since it creates a permeability barrier and serves as a physical interface here between interior and exterior of the cardiomyocyte, the phospholipid bilayer is essential for preserving the cardiomyocyte's structural integrity. Important enzymes like ion channels are also present, which control ionic gradients across cell membranes.Thus, a "phospholipid bilayer" makes up the cell membrane, also known as the plasma membrane.
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Which technology resulted from scientific observations of the structures of
plant seeds?
A. Improved prosthetic limbs
B. Solar cells
C. Antibiotics
D. Hook-and-loop fasteners
Answers
The technology which resulted from scientific observations of the structures of plant seeds is Hook-and-loop fasteners and is denoted as option D.
What is Technology?This is referred to as the application of scientific knowledge for practical purposes which in most cases makes work easier and better living conditions. An example is the production of a grinder which makes grinding easy and less strenuous.
The structure of a plant seed has a hook like structure which was studied and used by people in the production of Hook-and-loop fasteners and is therefore the reason why it was chosen as the correct choice.
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Answer:the answer is Hook-and loop fasteners
Explanation:
The hormone prolactin has varying effects in many different animal species. All vertebrates produce prolactin, which is involved in signal transduction pathways. In mammals, prolactin stimulates the production of milk in mammary glands. In fish, prolactin plays an important role in osmoregulation. In birds, prolactin is involved in lipid metabolism.
Answers
The hormone prolactin plays a crucial role in various biological processes in vertebrates, such as milk production in mammals, osmoregulation in fish, and lipid metabolism in birds.
Prolactin is produced by all vertebrates and is involved in **signal transduction pathways**. In mammals, it specifically stimulates the **mammary glands** to produce milk, ensuring proper nourishment for their offspring. In fish, prolactin is essential for maintaining a balance between water and ions in their body, contributing to proper osmoregulation. For birds, prolactin influences how their bodies break down and utilize fats, which is vital for energy production and overall metabolism. By understanding the various roles of prolactin in different species, we can gain insight into the diverse ways this hormone contributes to the survival and adaptation of animals.
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what are the three physical properties of minerals
PLEASE HELP ME
Answers
Hardness: Hardness is a measure of a mineral's resistance to scratching or abrasion. It is often determined using the Mohs hardness scale, which ranks minerals from 1 (softest) to 10 (hardest). For example, talc has a hardness of 1 and is the softest mineral, while diamond has a hardness of 10 and is the hardest known natural material.
Luster: Luster refers to the way a mineral reflects light from its surface. The luster of a mineral can be described as metallic, glassy (vitreous), pearly, silky, greasy, or dull, among other terms. Luster helps to distinguish between different minerals and is an important aspect of their appearance.
Cleavage and fracture: Cleavage describes the tendency of a mineral to break along smooth, flat surfaces that correspond to planes of weakness within its crystalline structure. Minerals with good cleavage will produce smooth, flat surfaces when broken. Fracture, on the other hand, refers to how a mineral breaks when it does not exhibit cleavage. Minerals that fracture can break in irregular, uneven, or jagged patterns. Both cleavage and fracture provide insight into the atomic arrangement and bonding within a mineral's crystal structure.
Other physical properties that are used to identify minerals include color, streak, specific gravity, crystal form, and transparency, among others.
The vaccination rates against Covid- 19 and the current ICU hospitalisation rates from Covid-19 over the last few weeks have been gathered for 13 regions of similar population size and density in the European Union. An investigation is to be done to see if the vaccination rates are affecting the ICU hospitalisation rates. Let Xi be the percentage of people not yet vaccinated and Yi the ICU hospitalisation rate as a number in ICU per several thousand population, for i=1 to 13 . The following information is also available: ∑iXi=727,∑iYi=754,∑iXi2=45,757.∑iYi2=46,322,∑iXiYi=45,508. Answer the following three questions. Each question carries 10 marks. 1. Explain the phrase 'Correlation is not Causation.' State a formal investigative hypothesis for the research discussed in this section, then set up the structure for an appropriate test to determine if the two variables of 'Vaccination rates' and 'current ICU hospitalisation rates' are correlated. 2. Use the sums shown above to calculate the sample correlation coefficient r for this data. Explain how already having the value of r from the previous question part will affect the structure of your test. Carry out the statistical test to determine if the two variables are correlated. 3. Explain the term least squares regression. Calculate the coefficients of the least squares regression equation for this data, using the information supplied. Comment on how well the least squares regression equation will fit the data in this case and therefore how useful it is.
Answers
The phrase "Correlation is not Causation" emphasizes that a correlation between two variables does not imply a cause-and-effect relationship between them. It means that even if two variables are correlated, it does not necessarily mean that one variable is causing the change in the other. In the context of the research on vaccination rates and ICU hospitalization rates, the investigative hypothesis could be: "There is a correlation between vaccination rates and ICU hospitalization rates in the 13 regions of the European Union." To test this hypothesis, a suitable statistical test would be the Pearson correlation coefficient, which measures the strength and direction of the linear relationship between two variables.
The sample correlation coefficient, denoted as r, can be calculated using the given sums:
r = (n∑XiYi - ∑Xi∑Yi) / sqrt[(n∑Xi^2 - (∑Xi)^2)(n∑Yi^2 - (∑Yi)^2)]
Using the provided values:
r = (13 * 45508 - 727 * 754) / sqrt[(13 * 45757 - 727^2)(13 * 46322 - 754^2)]
= 33788 / sqrt[(595741 - 527329)(602786 - 569516)]
≈ 33788 / sqrt[68384 * 33270]
≈ 33788 / sqrt[2271696480]
≈ 33788 / 47689.933
≈ 0.707
The value of r being 0.707 suggests a moderate positive correlation between vaccination rates and ICU hospitalization rates in the 13 regions of the European Union. Having the value of r allows us to determine the direction and strength of the relationship between the variables, aiding in the interpretation of the test results.
Least squares regression is a statistical method used to model the relationship between two variables by finding the best-fitting linear equation. The least squares regression equation can be represented as:
Y = a + bX
where Y is the dependent variable (ICU hospitalization rate), X is the independent variable (vaccination rate), a is the intercept, and b is the slope of the line.
To calculate the coefficients a and b, the following formulas can be used:
b = (n∑XiYi - ∑Xi∑Yi) / (n∑Xi^2 - (∑Xi)^2)
a = (∑Yi - b∑Xi) / n
Using the given sums:
b = (13 * 45508 - 727 * 754) / (13 * 45757 - 727^2)
≈ 33788 / 117951
≈ 0.286
a = (754 - 0.286 * 727) / 13
≈ 646.308 / 13
≈ 49.717
Therefore, the least squares regression equation for this data is:
Y = 49.717 + 0.286X
The quality of the fit of the least squares regression equation depends on the coefficient of determination (R-squared). Since the R-squared value is not provided, we cannot determine how well the equation fits the data in this case or its usefulness.
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Which best describes Active Transport?
A. Using energy, membrane proteins pick up particles and move them against the concentration gradient.
B. Without energy, particles move freely with the concentration gradient.
C. Using energy, glycoproteins pick up particles and move them against the concentration gradient.
D. Using energy, membrane proteins pick up particles and move them with the concentration gradient.
Answers
A. Using energy, membrane proteins pick up particles and move them against the concentration gradient.
I need the answers and a simple explanation, please :)
3. The main difference between saturated and unsaturated fatty acids is
(a) the amount of energy found in the fatty acid.
(b) saturated fatty acids are liquids.
(c) unsaturated fatty acids can be packed together very tightly.
(d) the number of hydrogen atoms bonded to the carbon atoms.
4. The function of proteins can include
(a) helping cells keep their shape.
(b) helping to destroy foreign substances.
(c) speeding up biochemical reactions.
(d) all of the above
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5. The characteristics of DNA includes which of the following?
(a) DNA is made of nucleotides consisting of a sugar, a phosphate group, and a carbon base
(b) DNA is made of a single polynucleotide chain, which winds into a double helix.
(c) DNA is how inherited characteristics are passed from one generation to the next.
(d) all of the above
6. Which category of organic compound is the major component of cell membranes?
(a) carbohydrate
(b) lipid
(c) protein
(d) nucleic acid
7. The cell wall of plants is made out of
(a) starch.
(b) glycogen
(c) cellulose
(d) chitin
Answers
Answer:
3. (a) the amount of energy found in the fatty acid.
4. (d) all of the above
5. (c) DNA is how inherited characteristics are passed from one generation to the next.
6. (b) lipid
7. (c) cellulose
Explanation:
3. Saturated fats have more energy due to the double bonds that are found in the molecules.
4. Different proteins have various and roles within the cell.
5. Each nucleotide, in turn, is made up of a nitrogenous base (not carbon base), a pentose sugar, and a phosphate. DNA is a double chain.
6. Biological membranes consist of a continuous double layer of lipid molecules in which membrane proteins are embedded.
7. The cell wall is composed of a network of cellulose microfibrils and cross-linking glycans embedded in a highly cross-linked matrix of pectin polysaccharides.
why do some leaves turn from green to red, orange, or yellow in the fall?
Answers
Answer:
Chlorophyll Breaks Down
Explanation:
because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible
U 2 can help me by marking as brainliest......
A)The water changed from blue to yellow when the student blew into it (step 2). Identify the compound that caused the water to change from blue to yellow.
B)Explain why the water turned blue again when the beaker with the waterweed was under the bright light (step 4). In your explanation, identify the process that caused this change.
C)Explain why there were bubbles on the waterweed leaves (step 4
Answers
Carbon dioxide is the compound that caused the water to change from blue to yellow.
How do you get carbon dioxide?Carbon dioxide is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature.
Carbon dioxide (CO2) comes from both natural sources (including volcanoes, the breath of animals and plant decay) and human sources (primarily the burning of fossils fuels like coal, oil and natural gas to generate energy).
Carbon dioxide is used as a refrigerant, in fire extinguishers, for inflating life rafts and life jackets, blasting coal, foaming rubber and plastics, promoting the growth of plants in greenhouses, immobilizing animals before slaughter, and in carbonated beverages.
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is the moon a star or a satellite
Answers
Answer:
A star but I like to prefur a planet
Explanation:
you examine a tissue sample under the microscope and discover that the tissue appears to be striated muscle. what can be concluded from this observation?
Answers
Skeletal muscle is the sole form of multinucleated muscle tissue. This is congruent with response choice "a". Skeletal muscle is also characterized by being long, unbranched, striated, and bearing a t-tubule system.
The only muscle tissues that exhibit striations are the skeletal and cardiac muscles, yet their activities are fundamentally different. The cardiac muscle is not voluntary, but the skeletal muscle is.
Many people associate all of this with their treating physician when it comes to the diagnosis and treatment of diseases. There is a lot that goes into identifying an illness, and pathology and histology play a big part in that.
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Full Question;
While examining a sample of muscle tissue under a microscope, you notice that the cells are multinucleated. They are long, unbranched, striated, and contain a developed transverse tubule system. Which muscle type does this sample contain?
a. Skeletal muscle.
b. Smooth muscle.
c. Cardiac muscle.
d. Striated muscle.
Cross Tt x Tt what is the excepted ratio of tall to short plants?
Answers
Here is the answer...hope it helps:)
Please help me !!! I'm having a hard time.
Answers
The amount of dissolved oxygen decreases with increase in temperature.
However, in chart 1 it was observed that the amount of dissolved oxygen increases with increase in temperature.
What is the relationship between dissolved oxygen and temperature?Dissolved oxygen is the amount of oxygen dissolved in water at a given temperature. Dissolved oxygen is important to aquatic animals for respiration.
The relationship between dissolved oxygen and temperature is that dissolved oxygen increases with decrease in temperature and vice versa.
Based on chart dissolved oxygen initially had a linear relationship with temperature. This, however is contrary to the expected results.
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When temperature goes up in
water, dissolved oxygen goes
down. What type of relationship
is this between the amount of
dissolved oxygen in water and the
water's temperature?
A. an uninvolved relationship
B. an exponential relationship
C. an inverse relationship
D, a reverse relationship
Answers
Answer:
C) an inverse relationship
Explanation:
As temperatures rise, dissolved oxygen levels fall; and as temperatures fall, dissolved oxygen levels rise. This is called an inverse relationship.
Automobile brake pads are either metallic or nonmetallic. An experiment is to be conducted to determine whether the stopping distance is the same for both types of brake pads. In previous studies, it was determined that car size (small, medium, large) is associated with stopping distance, but car type (sedan, wagon, coupe) is not associated with stopping distance. This experiment would best be done:
Answers
This experiment would best be done:to determine whether the stopping distance is the same for metallic and nonmetallic brake pads, a randomized controlled trial would be the best approach.
The study should include a sample of cars of different sizes (small, medium, and large) and the two types of brake pads. The cars should be driven at a consistent speed, and the brakes should be applied to determine the stopping distance for each car and brake pad type combination. The study should be double-blind, meaning that neither the drivers nor the experimenters know which type of brake pad is being used in each car.
The study should be designed to control for any potential confounding variables, such as weather conditions or road surface. The results should be analyzed using statistical methods, taking into account the effect of car size on stopping distance.
By conducting a randomized controlled trial, the experimenters can determine whether there is a significant difference in stopping distance between the two types of brake pads, while controlling for other variables that may affect the results.
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When reproduction involves two parents, which two statements describe the offspring?
A. Offspring differ genetically from one another.
B. Offspring differ genetically from both parents
C. Offspring are genetically identical to one another.
D. Offspring are genetically identical to one parent.
Answers
Answer:
I think it's B.
Sorry if i'm wrong tho
Answer:
A and B
Explanation:
I just did the test and i got them right
How does IVF technology contribute to the understanding of cells and cell processes?
Answers
The in vitro fertilization IVF technologies contribute to the understanding of cells and cell processes because it makes possible to observe the process of fecundation in a lab.
What is the real value of in vitro fertilization IVF technologies in studying cell processes?The real value of in vitro fertilization IVF technologies in studying cell processes is based on the fact we are now able to study the process of fecundation in real time.
Therefore, with this data, we can see that in vitro fertilization IVF technologies may be used to understand cell processes such as fecundation.
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Animal Cell Diagram
Pls help label them fast
Will mark brainlyest 75 points!
Answers
green thing is centriole
dot inside the nucleus(thing in middle) is nucleolus
red dot with tan circle is lysosome
tan stuff with black dots is rough ER
tan stuff with white outline is smooth ER
pink squiggly thing is golgi apparatus
I think that’s everything hope this helped!
ocean water contains all of the following elements except.
Answers
Answer:
Chemical and physical properties of seawater
The six most abundant ions of seawater are chloride (Cl−), sodium (Na+), sulfate (SO24−), magnesium (Mg2+), calcium (Ca2+), and potassium (K+). By weight these ions make up about 99 percent of all sea salts.
Two chromosomes that look alike and have the same sequence of genes in the same positions are a(n) ______ pair.
Answers
Answer:Gene
Explanation:
A wave hits an object as shown.
Which kind of wave interaction is shown?
Answers
Answer:
Refraction
Explanation:
The wave interaction shown is called refraction.
Refraction occurs when a wave crosses the boundary between two mediumIn this process the ray becomes bent. The density difference between the two medium accounts for the bending of the rays. When a ray crosses the boundary from a less dense to a denser medium, it is deflected to the normal as the ray slows down.Answer:
refraction
Explanation:
How might the variety of trains effect the survival of the lady bugs?
Answers
Answer:
they can have toxic effects on some animals. Ladybugs have a foul odor, which deters some predators from eating them. Their bright colors also help as a deterrent. In nature, red and orange, are warning colors that indicate to another animal or insect that the potential "lunch item" might not be a good choice
The data table shown below compares a small portion of the DNA for the same gene in three animals -a mouse, a whale, and a chicken. Use the data table to answer the question: Is a mouse more closely related to a baleen whale or a chicken? How do you know?A) A mouse is more closely related to a baleen whale because they are both gray.B) A mouse is more closely related to a chicken because they are both land animalsC) A mouse is more closely related to a chicken because they only share 8 nucleotide differences.D) A mouse is more closely related to a baleen whale because they only share 4 nucleotide differences.
Answers
When we compare the same gene on different organisms, those who have the least nucleotide differences are more related to each other.
Let's look at the table for the Hoxc8 gene.
We can see that the mouse and the blue whale have 4 differences in this gene, while the mouse and the chicken have 8 differences.
This means the right answer is D) A mouse is more closely related to a baleen whale because they only share 4 nucleotide differences.
If you block histone deacetylase, what effect would you expect to see on transcriptional activity?.
Answers
So there’s your answer: An increase in transcriptional activity.
How do animals survive in air pollution?
Answers
O Heat is the energy needed to change the temperature of 1 gota substance by to
O Heat is the average kinetic energy of the particles of a substance
O Heat is the total energy of a substance due to the movement of is partides.
O Heat is the energy that thows between buvo substances of different temperatures
Answers
O Heat is the average kinetic energy of the particles of a substance
This type of energy is not always predictable.
Answers
Answer:
Wind energy.
Explanation:
In this way, the biggest shortcoming of wind energy, which is that it is not always stable and predictable, is solved by the new technology. It goes without saying that this impressive and innovative combination of wind as a renewable energy source and the power of water as storage energy has a lot to offer in the energy production field.
Which of the following can decrease the amount of carbon dioxide in the atmosphere?
Answers
Answer:
not sure
Explanation:
..HeLp......plEaSe.....
IM PoOpEd iDoNtKnOw
Answers
Answer:
Stem cell is the special type of cell that can differentiate to give any cells in the body. Cell therapy nowadays are using stem cell in order to replace damaged tissue.
Explanation:
Anil and Bala have the choice of using either Integrated Pest Control (IPC) or Terminator (T) to solve the problem of pest insects. The following diagram shows these possible outcomes on a graph. (You will find the matrix form of the game in the textbook - Figure 4.3 b - if you find that helpful.) Based on the information above, which of the following is correct? Select one or more: a. (T,T) is the only Pareto inefficient outcome. b. (I,I) is the unique Pareto efficient outcome. c. Anil and Bala will both be happy to move from the Pareto efficient (I, T) to the "fairer" Pareto efficient outcome (I, I). insects. The following diagram shows these possible outcomes on a graph. (You will find the matrix form of the game in the textbook - Figure 4.3 b - if you find that helpful.) Based on the information above, which of the following is correct? Select one or more: a. (T,T) is the only Pareto inefficient outcome. b. (I,I) is the unique Pareto efficient outcome. c. Anil and Bala will both be happy to move from the Pareto efficient (I, T) to the "fairer" Pareto efficient outcome (I,I). d. (T, I) Pareto-dominates (T,T).
Answers
Based on the information provided, the correct statement is:
c. Anil and Bala will both be happy to move from the Pareto efficient (I, T) to the "fairer" Pareto efficient outcome (I, I).
:
Pareto efficiency refers to a state where no individual can be made better off without making someone else worse off. In this scenario, the outcomes are represented by the choices of using Integrated Pest Control (IPC) or Terminator (T).
From the given information, we can deduce that (I, I) is the Pareto efficient outcome. This means that both Anil and Bala are satisfied with this outcome, as neither of them can be made better off without making the other worse off.
On the other hand, (T, T) is the only Pareto inefficient outcome. This indicates that there exists an alternative outcome, (I, I), where both Anil and Bala would be happier.
However, the given information does not provide any details about the outcome (T, I) and its relation to (T, T) in terms of Pareto dominance. Therefore, statement d. (T, I) Pareto-dominates (T, T) cannot be determined based on the given information.
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