Which of the following questions is answered during the G2 checkpoint of the cell cycle?
a. Have all chromosomes been replicated without damage?
b. Are conditions favorable for cell division to begin?
c. Are all chromatids attached correctly to the spindle microtubules?
d. Are there adequate reserves to release the cell?
a. Have all chromosomes been replicated without damage?
The question, have all chromosomes been replicated without damage, is answered during the G2 checkpoint of the cell cycle.
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In the developing nervous system, ________ is the signaling molecule that results in the differentiation of ___________
A. Notch; neurons B. Notch; glial cells C. Delta; glial cells D. Delta; neurons
In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This is an example of
A. negative frequency-dependent selection. B. directional selection. C. disruptive selection. D. balancing selection.
An organelle that breaks down amino acids,
fatty acids, and toxic substances is the
a. peroxisome b. Golgi body c. mitochondrion d. lysosome e. smooth endoplasmic reticulum
Which of the following is the most inclusive?
a. organism b. community c. ecosystem d. population e. organ system