If the teacher wanted to show the students what a lophophore is and how it works, the teacher would point out a feeding _____
A) hydra
B) sponge
C) gastropod
D) ectoproct
D
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Why is antigenic drift a problem for the immune system?
A. It requires a new, primary response by B cells. B. The ability of MHC to present antigen is affected. C. T cell receptors may not recognize the altered antigen. D. Two answer options are correct: It requires a new, primary response by B cells AND T cells may not recognize the altered antigen.
Moves in the genome through an RNA intermediate
Match the description with the appropriate term.
When genes are on different chromosomes, what percentage of gametes produced by a double heterozygous individual will be recombinant?
a. 100% b. 75% c. 50% d. 25% e. 0%
Which of the following are inorganic molecules that bind to enzymes?
A) apoenzymes B) coenzymes C) cofactors D) holoenzymes