During the third trimester of development, the major change that occurs in the growing unborn child is
A. development of the skeleton.
B. a great increase in size.
C. formation of legs and arms.
D. morphogenesis.
Answer: B
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cDNA is made using what as the starting material?
A. plasmid vectors B. viral DNA C. chromosomal DNA D. mRNA
What is the mechanism by which binding of testosterone to the testosterone receptor leads to upregulated gene transcription?
A. Binding of testosterone to the testosterone receptor leads to the increase in second messengers that activate a kinase cascade, ultimately leading to the activation of transcription factors that promote gene transcription. B. Binding of testosterone to the testosterone receptor leads to the activation of a G protein that stimulates the activation of enzymes that promote gene transcription. C. Binding of testosterone to the testosterone receptor leads to a conformational change that allows the receptor to enter the nucleus where it can bind to DNA and promote gene transcription. D. Binding of testosterone to the testosterone receptor leads to the opening of an ion channel that leads to an increase in calcium in the cytoplasm. The increased calcium levels activate calmodulin, which can go on to activate other proteins that promote gene transcription.
What is the role of centromeres and telomeres?
What will be an ideal response?
In small populations, gene frequencies can change drastically by chance alone. This phenomenon is called
A. density-dependent effects. B. migration. C. density-independent effects. D. genetic drift.