Which substance is a waste product of nitrogen metabolism in some amniotes that is excreted as a semisolid paste, reducing water loss?
a. nitric oxide
b. uric acid
c. squalene
d. urea
e. ammonium
ANSWER: b
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Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?
A. Involution B. Convergent extension C. Embryonic development D. Cellular differentiation E. Cellular respiration
In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____
replication origin.
a. circular; one b. circular; more than one c. linear; more than one d. linear; one e. linear; no
Decomposers perform their recycling efforts
on organisms
a. at the end of a food chain. b. on the top of a pyramid. c. that are producers. d. that are consumers. e. that are all of these.
You have two types of cells that both produce a particular protein. You notice that when you heat up the cells, the first type of cell's protein loses function while the second type of cell's protein retains function. How is this possible?
a. The first cell has weaker mRNA. b. The protein of the second type of cell has a completely different primary structure from the protein of the first type of cell. c. The second type of cell expresses a chaperone protein that the first type does not. d. None of the other answer options is correct.