Which of the following events might trigger induction of a temperate bacteriophage?
a. Bacterial conjugation
b. Exposure to UV light
c. An infected cell entering the logarithmic phase of growth
d. Normal cell division of an infected cell
Answer: b. Exposure to UV light
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Which of the following organelles can grow and divide to reproduce themselves?
A. mitochondria only B. chloroplasts only C. peroxisomes only D. both mitochondria and chloroplasts E. Mithochondria, chloroplasts, and lysosomes can reproduce themselves.
In a pine tree, which of the following forms at fertilization?
a. a diploid zygote b. a megaspore c. a staminate cone d. a pollen grain
How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes? What will be an ideal response?
What is TRUE of restriction enzymes?
A. They catalyze the formation of hydrogen bonds between DNA fragments. B. There are less than 10 restriction enzymes known. C. They are not naturally produced by bacteria, but are bioengineered by humans. D. They cut at random sites within a genome. E. They protect bacterial cells from invasion by foreign DNA.