cAMP affects cell activities by interacting directly with
A) adenylyl cyclase.
B) protein kinase A regulatory subunits.
C) protein kinase A catalytic subunits.
D) cAMP phosphodiesterase.
E) calmodulin.
Answer: B
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Brittany and Jarod have been trying to have a second child for 10 years. They have one healthy child, but Brittany has had four early, spontaneous abortions. The most likely explanation for the many pregnancy losses is that Brittany and Jarod
A) are not having sex frequently enough. B) are each heterozygous for lethal alleles of the same gene. C) are each homozygous for lethal alleles of the same gene. D) have different alleles for all of their vital genes.
Organic molecules are defined as chemical compounds that contain in distinct ratios and structures.
A. carbon and nitrogen B. carbon and oxygen C. carbon D. carbon and hydrogen E. carbon, hydrogen, and nitrogen
If E. coli bacteria are grown only in the presence of lactose, then the repressor will
A. not bind the operator, allowing transcription of the lac operon genes. B. bind the operator, preventing transcription of the lac operon genes. C. bind the operator, allowing transcription of the lac operon genes. D. not bind the operator, preventing transcription of the lac operon genes. E. bind the operator, preventing translation of the lac operon genes.
Which of the following is NOT a nucleotide base found in DNA?
A. Adenine B. Thymine C. Guanine D. Cytosine E. Uracil