Give the function of all of the following parts of a typical flower. a. Petalsb. Stamen c. Pistil
d. Ovule
Please help.
Answers
Answer:
The petals of a flower are usually brightly colored to attract pollinators such as bees, butterflies and hummingbirds. The stamen is the small body that holds and produces pollen. The pistil is the ovary of the flower. Ovules are the egg cells of a flower, which eventually become seeds.
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Cyanobacteria are important to the evolution and advancements of other life on Earth because theyA) were the first life form on earth. B) produced oxygen from photosynthesis. C) were the first group of organisms to leave a fossil record. D) were thought to have become mitochondria in the cells of animals.
A botanist wants to observe the change in rate of growth of plants compared to the change in amount of rainfall on randomly selected days. Which one of the following tools would be the best choice for representing this data?
In humans, the hormone testosterone enters cells and binds to specific proteins, which in turn bind to specific sites on the cells' DNA. These proteins probably act to do what? See Concept 18.2
This is an artificial genetic sequence from combining two other sequences in a plasmid.
0 2
1 6
2 18
Write an exponential function to represent the spread of Ben's social media post.
Answers
N(0) = 2 x 3^0 = 2
N(1) = 2 x 3^1 = 6
N(2) = 2 x 3^2 = 18
An exponential function is represented by:
y = ab^x
where a is the initial value and b is the growth rate.
The exponential function for this case would be:
y = 2(3)^x
y = 6^x
Answer:
Explanation:
The general exponential function is written as :-
,where y is the amount of the material after t years , A is the initial amount and b is the multiplicative rate of growth.
From the given table, the number of shares on day 0 = 2 .
Thus the initial number of shares = 2
The growth factor is given by the ratio of the consecutive terms :-
Now, put A = 2 and b = 3 in (i), we get
∴ The exponential function to represent the spread of Ben's social media post is
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HbS gene is a variant of the β-globin gene responsible for sickle hemoglobin. Sickle-cell anemia is a recessive disorder caused by the presence of two recessive alleles. But, when there is an outbreak of malaria, frequency of the recessive allele for the HbS gene will increase. This is because in an area with malaria, heterozygous individuals (with one dominant allele and one recessive allele) have an advantage. These individuals will have both normal and sickle hemoglobin. But pathogen that causes malaria affect only normal hemoglobin, so heterozygous individuals are more resistant to malaria.
Answer: The frequency of the recessive allele increases
Explanation: The HbS gene is a variant of the B-globin gene which is responsible for sickle hemoglobin. There is a recessive disorder called sickle cell anemia that is caused by someone having two recessive alleles. When there's an outbreak of Malaria the frequency of the recessive allele of the HbS gene increases because people that are heterozygous have the advantage due to the fact they have normal and sickle hemoglobin so they are more resistant to malaria because malaria will only take action on normal hemoglobin.
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Answer:
The study is an observational study because the researcher is simply collecting data from the students.
Explanation:
This case is an observational study since the medical investigator is observing and comparing individuals regarding a difference in systolic blood pressure levels between males and females.
For the study to be an experiment, the researcher should do an intervention on the students, to then collect data and study the effects of it. Also, he should group the students by chance to properly conduct an experiment.
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Answer:
Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
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Tysm!
Answer:
breathing allows the exchange between 2 gases: oxygen and carbon dioxide. Gas exchange occurs in millions of lung alveoli and the capillaries that surround them
Explanation:
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Answer: Ella came to the conclusion the cells were a plant because plant cells are rectangular, and it has a central vacuole to store food and water, it would also contain a cell wall and a cell membrane. I think that Ella is correct if she saw all these things through her microscope. Plant cells contain an organelle called chloroplast, and this organelle has chlorophyll which supports photosynthesis. So yes, Ella is correct.