If there are 1,000 metric tons of producers in an ecosystem, about how much of the energy in those producers will be available to secondary consumers in this ecosystem?
A) 100%
B) 50%
C) about 10%
D) about 1%
E) about 0.1%
Ans: D) about 1%
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If a biochemist discovers a new molecule, which of the following pieces of data would allow her to draw the conclusion that the molecule is a steroid hormone?
I) The molecule is lipid soluble. II) The molecule is derived from a series of steps beginning with cholesterol. III) The molecule acts at a target tissue some distance from where it is produced. IV) The molecule uses a carrier protein when in an aqueous solution such as blood. A) only I and III B) only II and IV C) only I, III, and IV D) only II and III E) I, II, III, and IV
The hollow crater formed during gastrulation is known as
A. acrosome B. archenteron C. morula D. cleavage furrow E. trophoblast
Smallpox is an enveloped virus with a DNA genome. We have eliminated this once deadly virus through an aggressive worldwide vaccination program. Why might a vaccine be successful with smallpox, but not with HIV?
A. DNA genomes mutate less rapidly than RNA genomes. B. Host cells have RNA in them, and thus do not raise antibodies against RNA. C. RNA is more stable than DNA, and is less likely to be destroyed by the vaccine. D. Viruses with DNA genomes must replicate inside a host cell. E. Smallpox is an enveloped virus.
Which of the following body parts is surrounded by a mucous membrane?
A. cavities of freely movable joints B. abdominal cavity C. heart D. ovaries E. tubes of the digestive system