Which of these statements best describes gene expression in a damaged cell?
A) In a damaged cell, p53 is low and BAX transcription is inactive, so Bcl-2 represses apoptosis.
B) In a damaged cell, p53 is high and BAX transcription is active, so Bcl-2 is repressed and apoptosis is induced.
C) In a damaged cell, p53 is low and BAX transcription is active, so Bcl-2 represses apoptosis.
D) In a damaged cell, p53 is low and BAX transcription is active, so Bcl-2 is repressed and apoptosis is induced.
E) In a damaged cell, p53 is high and BAX transcription is inactive, so Bcl-2 is activated and apoptosis is induced.
B
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Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?
A. Flower petals carry out high levels of photosynthesis and require high light conditions. B. A minimum amount of light is always necessary for flowering. C. This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal. D. This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal.
The starting point for the ovarian cycle is a ____
a. primary oocyte arrested in meiosis I b. primary oocyte arrested in meiosis II c. primary oocyte having just completed meiosis I d. secondary oocyte arrested in meiosis I e. secondary oocyte arrested in meiosis II
When large populations are spread across vast geographic distances, which evolutionary force is affected?
a. mutation b. genetic drift c. natural selection d. nonrandom mating
Prokaryotes reproduce
a. very slowly. b. via binary fission. c. sexually. d. such that one of the offspring is always much larger than the other. e. via binary fusion.