The two major phagocytic cells of the body are
A. plasma cells and monocytes.
B. B cells and T cells.
C. mast cells and natural killer cells.
D. macrophages and neutrophils.
E. B cells and neutrophils.
Answer: D
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What is the role of Rad51 in eukaryotic recombination events?
A. It introduces single-strand breaks in the chromosome. B. It degrades the 5'-ending strand to create 3'-ending single-strand overhangs. C. It is a helicase that assists in separating the DNA strands at the site of breakage. D. It is a single-strand DNA binding protein that coats the 3'-ending single-strand overhang. E. It is a RecA-class recombinase that mediates strand invasion.
Darwin's concept of evolution "the theory of descent with modification through variation and natural selection" can be demonstrated by which of the following examples?
A. A giraffe stretches his neck to reach higher branches. The exercise of stretching up strengthens the muscles in the neck and legs. This ability to stretch is also seen in the giraffe's offspring. B. A monkey accidently drops her fruit in the salty water of a bay, she recovers the fruit and eats it. She discovers that the fruit is cleaner and tastes better after it has been in the salty water. She continues to wash fruit in the bay before eating. Her offspring see what she has done and also wash their fruit in the salty water. Soon the whole population is washing their fruit. C. Several turtles hatch from a clutch of eggs buried in the sand on a beach. One of the turtles is the color of the sand, the others are darker in color. The turtles all scurry to the water, but one by one the dark turtles are eaten by birds, only the sand colored turtle survives. When it enters the water the sand color changes to a darker brown. The turtle grows, mates and has offspring that are also sand colored when they are born. D. A female alligator gives birth to a male alligator that has the ability to change color to a bright white when it is in cold water. The baby male alligator is quickly spotted by a large bird of prey and eaten.
In an individual pea plant, the seeds are yellow and wrinkled. These attributes are the plant's ________.
Fill in the blank(s) with the appropriate word(s).
The portion of a mycorrhizal fungus that penetrates the cell walls of the root cortex is called a(n) arbuscule. Indicate whether the statement is true or false