During which cell cycle phase(s) are chromosomes composed of two DNA molecules?
A) G2
B) G1
C) anaphase
D) Answers (A) and (B) are correct.
E) Answers (A), (B), and (C) are correct.
A
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Which branch of this phylogenetic tree identifies the common ancestor of all modern organisms?
a. A b. B c. C d. D e. E
Which of the following is a characteristic of nonvascular plants?
A) Extensive root system B) Stems and leaves C) Xylem and phloem D) Small size E) All of the above
Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce
sterile young. This scenario is an example of A) sympatric speciation. B) allopatric speciation. C) incomplete speciation. D) diversifying speciation.
Cytotoxic T cells eliminate pathogens by
A) releasing chemicals which are toxic to cellular pathogens. B) ingesting and digesting infected or cancerous cells. C) coordinating the activities of other immune cells. D) releasing chemicals which cause infected or cancerous cells to undergo apoptosis. E) ingesting and digesting cellular pathogens.