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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology