Given that the correct number of chromosomes is vital to the proper functioning of a cell, which of the statements below is correct if a cell passes from G1 to S phase in the cell cycle?
A. The cell copies its chromosomes and
enters G2 or returns to G1.
B. The cell completes the process of cell
division or it dies.
C. The cell divides or returns to G1 and
enters G0.
B
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Which scenario is an example of commensalism?
a. acacia trees coevolved with ant colonies that protect the tree from herbivores b. bacteria provide glucose to legume plants c. cattle egrets feed on insects flushed out from the grass by cattle d. plants coevolved with their pollinators
________ lowers blood sugar levels; ________ raises it
Fill in the blank(s) with correct word
During library screening, PCR, Southern blotting, and other techniques, binding two pieces of DNA to each other by hydrogen bonding is called ________
A) autoradiography B) hybridization C) DNA ligation D) reverse transcription E) polyadenylation
Based on evidence from "primate molecular clocks," a primate common ancestor of humans and chimpanzees existed about:
A) 6—7 million years ago. B) 4—5 million years ago. C) 3 million years ago. D) 10 million years ago.