What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have spiral cleavage.
B. They shed their exoskeletons.
C. They all have segmentation.
D. They all have tropchophore larvae.
Answer: B
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What occurs when an inducer is added to an environment containing an organism with a metabolic pathway controlled by a repressor?
A) The inducer combines with the repressor and activates the pathway. B) The inducer combines with the repressor and inactivates the pathway. C) The inducer combines with the substrate and blocks induction. D) The inducer does not combine with, but functions as a chaperone molecule for, the enzyme-substrate complex.
Which of the following is false of appendicitis? a. Appendicitis is treated by removing the appendix surgically
b. Appendicitis can be fatal if the appendix ruptures. c. Cases of appendicitis generally resolve by themselves without treatment. d. Appendicitis is an inflammation of the appendix.
A lake in which nutrients are low is
a. atrophic. b. oligotrophic. c. eutrophic. d. hypotrophic. e. hypertrophic.
Which of the following represents the possible genotype(s) resulting from a cross between an individual heterozygous
(Bb) and one that is homozygous (bb)? a. BB and Bb
b. Bb and bb c. BB only d. Bb only e. bb only