Which of the following statements about hydrostatic skeletons is true?
a. Compression of fluids causes movement of an animal body.
b. Hydrostatic skeletons permit very precise and delicate movements.
c. Fluid is moved throughout an organism due to alternating contractions of antagonistic
muscles.
d. Contraction of the inner circular muscles causes the body of an organism to shorten.
e. Contraction of the outer longitudinal muscles causes the body of an organism to lengthen.
C
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For biologists studying a large flatworm population in the lab, which Hardy-Weinberg condition is most difficult to meet?
A) no selection B) no genetic drift C) no gene flow D) no mutation E) random mating
If a bicep was cut so that it no longer attached to bone, why would this limit motion of the upper arm?
A. The biceps and triceps antagonize one another in the motion of the arm; cutting removes one antagonist. B. The bicep is where the arm connects to all relevant nerve cells. C. The bicep is the main muscle for moving the arm. D. The other arm muscles all connect to the bicep and would also become detached as a result. E. None of the answer choices is correct.
Which feature is an evolutionary novelty of hexapods?
A. Chitinous exoskeletons B. Antennae C. Jointed appendages D. Wings E. Mandibles
Researchers are developing a ribozyme that cleaves the HIV genome. This pharmaceutical agent could be described as
A) an RNA molecule capable of catalysis. B) a hydrolase. C) a genetic transposable element. D) a protease inhibitor. E) a competitive inhibitor for reverse transcriptase.