Cytosine deamination is a common mutation that results in a cytosine being converted to a uracil. See Figure (a) below. What is the repair mechanism used to restore the correct base?
A. nucleotide excision repair
B. mismatch repair
C. base excision repair
C
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Nitrogen-fixing bacteria receive ____ from
their host plant.
a. proteins b. lipids c. carbohydrates d. minerals e. water
The Golgi apparatus has a polarity, or sidedness, to its structure and function. Which of the following statements correctly describes this polarity?
A) Transport vesicles fuse with one side of the Golgi and leave from the opposite side. B) Proteins in the membrane of the Golgi may be sorted and modified as they move from one side of the Golgi to the other. C) Lipids in the membrane of the Golgi may be sorted and modified as they move from one side of the Golgi to the other. D) All of the listed responses correctly describe polarity characteristics of the Golgi function.
Refer to Figure 50-2. The function of the structure labeled 3 is:
a. to secrete an alkaline fluid that neutralizes the acids of the vagina. b. to produce a nutritive fluid for the sperm. c. to provide a place for maturation and storage of sperm. d. to secrete mucus that lubricates the penis. e. None of these.
Which of the following activities could lead to a decrease in the genetic diversity in the gene pool of a species?
A. an increase in the reproductive rate, which results in increased population size B. a decrease in the size of the population from millions to hundreds C. the absence of mutations D. the species switches from asexual reproduction to sexual reproduction