Biology Q&A

Question

What role does cholesterol play in the plasma membrane?
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Answer

It maintains optimal fluidity in the membrane.

Question

Why do we think of the plasma membrane as a semipermeable membrane?
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Answer

The plasma membrane is somewhat permeable to water and some other substances but is impermeable to other substances.

Question

What metabolic pathway occurs in the cytoplasm of the cell?
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Answer

Glycolysis and fermentation only.

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Question

If a daughter cell contains six chromosomes at the end of meiosis I, how many chromosomes will each of the daughter cells contain at the end of meiosis II?
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Answer

6 because it will be the same.

Question

A couple has had three children, all of whom are boys. When the woman becomes pregnant a fourth time, they are hopeful that this one is a girl. What is the chance that this child will be a girl?
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Answer

1/2 because sex is determined by the male gamete, which can be carrying either an X or Y chromosome. Therefore, there is a 1/2 change that it is a girl and previous offspring have no effect on this outcome.

Question

In one of the steps of the carbon cycle, a person exhales a molecule of carbon dioxide (CO2) into the atmosphere. Which of the following is most likely to happen next to the atom of carbon in this molecule?
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Answer

It may be used as part of a sugar in a plant.

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Question

When gametes are produced from a parent cell during normal meiosis, which of the following describes the number of chromosomes in each resulting cell?
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Answer

Each resulting cell has one-half the number of chromosomes as the parent cell.

Question

In mussels, the allele for brown coloring (B) is dominant, and the allele for blue coloring (b) is recessive. For which parental genotypes are 100% of the offspring expected to be blue?
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Answer

bb X bb

Question

An RNA sequence is shown at right. A U G C C G A A A C G U Which of the following statements describes how the RNA sequence specifies the production of an amino acid chain?
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Answer

Each group of three RNA bases codes for a single amino acid.

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