The enzyme DNA polymerase is most active during which of the following phases of the mitotic cell cycle?
a) Gap-2 (G2)
b) Metaphase
c) Cytokinesis
d) Prophase
e) Gap-1 (G1)
f) Anaphase
g) Telophase
h) Synthesis (S phase)
Ans: h) Synthesis (S phase)
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The seeds of many plant species are dispersed by a harmless temporary attachment to an animal's fur or feathers. This form of dispersal is known as
A. ectoparasitism. B. amensalism. C. mutualism. D. phoresy. E. trophic mutualism.
Haploinsufficiency ____
a. produces Barr bodies
b. results from elevated gene dosage c. occurs when a diploid organism has only one functional copy of a gene d. occurs due to gene duplication e. refers to the loss of a whole set of chromosomes
Which microscope shows cells against a bright background and the intracellular structures of unstained cells based on their varying densities?
A. phase-contrast B. fluorescence C. dark-field D. bright-field E. electron
Which of these is not found in a strand of DNA?
A) hydrogen bonds B) a 5-carbon sugar C) phosphate groups D) nitrogen-containing bases E) sterols