If you want to get DNA from a eukaryotic cell, which of the following structures would provide the largest concentration?
A. ribosome
B. nucleus
C. mitochondria
D. lysosome
B. nucleus
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Paland and Lynch showed that sexual populations possessed fewer deleterious mutations than asexual populations. These results supported the hypothesis that
A. sexual reproduction prevents fertilization with gametes carrying alleles with deleterious alleles. B. sexual reproduction produces fewer random mutations than asexual reproduction. C. asexual reproduction is associated with lower genetic diversity, resulting in the accumulation of highly deleterious mutations. D. in sexual reproduction, the reassorting of alleles allows for the elimination of more detrimental alleles than in asexual reproduction. E. sexual strains are associated with higher genetic diversity and thus accumulate more beneficial mutations than asexual strains.
Deer and blue jays both eat acorns. By using the same resource, each reduces the amount of the resource available to the other. This is an example of ____ competition
a. interspecific b. interference c. exploitative d. resource e. predatory
How does mitotic prophase differ from prophase I of meiosis?
a. Chromatin supercoils only in mitotic prophase. b. The nuclear envelope disappears only in prophase I of meiosis. c. Synapsis occurs in mitotic prophase and but not in meiotic prophase I. d. The chromatids separate in mitotic prophase, not in prophase I of meiosis. e. Crossing over is characteristic of prophase I of meiosis but not of mitotic prophase.
Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?
A. This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal. B. Flower petals carry out high levels of photosynthesis and require high light conditions. C. A minimum amount of light is always necessary for flowering. D. This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal.