Which of the following is true of DNA?
A. The nucleotides in one strand are connected by hydrogen bonds.
B. A phosphate group in a nucleotide is attached to the 3 carbon in ribose.
C. A purine always forms a complementary base pair with a pyrimidine.
D. The percentage of the purine A always equals the percentage of the purine G.
E. It is used by ribosomes for translation.
Answer: C
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For a gene with two alternative alleles, B and b, the term q2 in the Hardy-Weinberg equation represents
A. the frequency of the B allele. B. the frequency of the bb genotype. C. the total number of individuals in the population. D. the total number of alleles for that gene in the population. E. the frequency of the Bb genotype.
Calmodulin is involved in the regulation of:
A. skeletal muscle contraction. B. propagation of a nerve impulse across a synapse. C. contraction of smooth muscle. D. propagation of heart muscle contraction to the entire myocardium.
Which of the following features were present in the transitional species between amphibian tetrapods and the fishes?
A. fins, rounded head with eyes on the side, and a neck B. lungs, fins, and scales C. fins, simple wrist bones, and expanded ribs D. a flat head with eyes on the top, fins, and scales
When an invasive species alters the community structure it is introduced to, what can the consequence be?
a) extinction of economically important species b) reduced predation on some native species c) increased predation on some native species d) all of the above