The nuclear envelope breaks down during mitosis because
A. the mitotic spindle has formed
B. the chromosomes have condensed
C. specific nuclear proteins have become phosphorylated
D. the centrosomes have duplicated
Answer : C. specific nuclear proteins have become phosphorylated
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To find the gene that encodes for the blue-light receptor, researchers inserted the gene for the PHOT1 protein into insect cells growing in culture
When they exposed the transgenic cells to blue light, they found that the PHOT1 protein became phosphorylated. No other plant proteins were present in the insect cells. Which of the following is a reasonable conclusion from this result? The PHOT1 protein _____. A) enabled the insect cells to photosynthesize B) phosphorylated itself in the presence of blue light C) is not responsive to blue light D) is photoreversible E) is not functional in insect cells
Was this a pre-mating or post-mating barrier?
a. pre-mating barrier, because individuals do not mate b. post-mating barrier, because hybrids are produced but they do not reproduce c. pre-mating barrier, because fertilization occurs but the hybrids are not viable d. post-mating barrier, because hybrids are sterile and unable to mate
Carlson's experiments dealt with biases in which of the following ways ?
A. The subjects and the scientists were not made aware of the personality profile results from both the astrologers and the CPI test B. The astrologers were allowed to predict their own threshold of success prior to the experiment C. Subjects were divided into control groups who were not given their true personality profile as a choice and a treatment group who were given their personality profile as a choice D. Subjects were matched with individuals with the same sun sign before assignment to a control or a treatment group E. All of the above
As a control, the unshaved shrews would have to be handled by researchers but would not have to see a razor.
a. true b. false