A typical sponge is ____ because it produces ____
a. a hermaphrodite; only egg cells
b. parthenogenetic; both egg and sperm cells
c. a hermaphrodite; both egg and sperm cells
d. parthenogenetic; only egg cells
e. a hermaphrodite; only sperm cells
c
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
You cut a plasmid with a restriction enzyme that cuts it into three pieces — one fragment is 240 base pairs, one fragment is 600 base pairs, and one fragment is 1200 base pairs. You carry out electrophoresis of the digested sample. Which of the fragments will be closer to the top of the gel where the sample was inserted?
A. The 240 base pair fragment. B. The 600 base pair fragment. C. The 1200 base pair fragment. D. They will all be near the top because they all have sticky ends. E. It depends on the charge of the DNA fragment.
If you cross two pea plants, one with green peas and the other with yellow peas, you find all of the offspring have yellow peas. You conclude the yellow parent was Select one:
a. homozygous for the recessive allele. b. homozygous for the recessive gene. c. homozygous for the dominant gene. d. homozygous for the dominant allele. e. heterozygous.
Based on the data in Figure 38-1, the condition that results in root development is:
a. a high ratio of auxin to cytokinin. b. a low ratio of auxin to cytokinin. c. a relatively equal proportion of auxin to cytokinin. d. cytokinin levels of at least 0.2 mg/L. e. auxin concentrations of 0.5 mg/L.