The chemical nature of each amino acid is determined by which of the following groups?
A) amino
B) carboxyl
C) hydroxyl
D) R
E) hydrogen
Answer: D
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Nematodes and rotifers have a body cavity that is
(a) called a coelom. (b) called a pseudocoelom. (c) completely lined by tissues derived from mesoderm. (d) both a and c.
In heterosporous plants, megaspores form in ____ and give rise to ____
a. megasporangia; egg-producing female gametophytes b. megasporangia; sperm-producing male gametophytes c. microsporangia; egg-producing female gametophytes d. microsporangia; sperm-producing male gametophytes e. megasporangia; both egg-producing and sperm-producing gametophytes
What is the correct order in bacterial antigen
processing and presentation? 1. lysosomal enzymes digest the bacterium into molecular bits 2. the antigen-MHC complex is displayed on the cell surface 3. the endocytic vesicle fuses with a lysosome 4. a bacterium is engulfed by a phagocytic cell
a. 4-3-1-2 b. 4-3-2-1 c. 3-4-2-1 d. 3-4-2-1 e. 2-4-3-1
The primary transcripts in eukaryotes are most accurately described as
A. a faithful copy of the entire gene including exons and introns. B. an exact copy of the gene, but the introns have been removed. C. an RNA copy, but the noncoding exons and introns have been removed. D. having the exons removed and the introns retained for translation. E. composed of RNA polymerase and associated histones.