The versatility of which atoms can be assembled into a wide variety of organic compounds?
A. Carbon
B. Glucose
C. Hydrocarbon
D. Polymer
E. Starch
Answer: A
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Biochemical systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, lock and key D. post-zygotic, temporal separation E. post-zygotic, ecological separation
Why aren't ferns commonly found in deserts?
A. Fern fronds are sensitive to UV light. B. Fern spores are unable to resist prolonged dry conditions. C. Ferns are non-vascular and cannot absorb water from deep within the soil. D. Fern pollen is spread by insects that do not occur in deserts.
If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?
A) 10 B) 20 C) 40 D) 80
RNA is believed to have been the initial genetic system because it can
a. form a stable double helix with a complementary nucleic acid strand. b. catalyze the polymerization of nucleotides into another RNA strand. c. form ribosomes. d. transfer amino acids to ribosomes.