The initial importance of a membrane enclosing self-replicating RNA molecules and associated proteins was that a membrane
a. maintained these molecules as a unit capable of reproduction and evolution.
b. provided sites for proteins to function.
c. transported materials in and out of the compartment.
d. kept other molecules out of the compartment.
Ans: a. maintained these molecules as a unit capable of reproduction and evolution.
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Figure 15.1 shows the three alleles of the beta-globin gene. Which one of the following genotypes is heterozygous?
A. AA B. SS C. CC D. AS E. None of the answer options are correct; all of the genotypes listed are homozygous.
What are the most abundant zooplankton?
a. Coccolithophores b. Copepods c. Dinoflagellates d. Foraminiferans
When the prey population is below the predator isocline, the predator population is
a. increasing b. decreasing c. neither increasing nor decreasing
A carefully planned and executed manipulation of the natural world used to test a prediction in the scientific method is a(n) ________
Fill in the blank(s) with correct word