The phenotypic ratio for the F1 generation that results from a testcross between a homozygous individual and a heterozygous individual is
A. 1:1
B. 2:1
C. 3:1
D. 1:2:1
A. 1:1
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What information cannot be determined from the DNA sequence of a cDNA clone?
A) exon sequences B) sequence of the promoter C) similarity to previously identified sequences D) amino acid sequence of the encoded polypeptides E) sequence of the spliced mRNA transcript
Enzyme activity may be regulated by several means. What is the mode of regulation in each of the following examples?
A) allosteric regulation or feedback inhibition B) substrate-level regulation C) inhibition D) proteolytic cleavage 1) When glucose is converted to glucose-6-phosphate by hexokinase, the accumulation of glucose-6-phosphate inhibits the reaction. 2) A foreign substance is added to the reaction in part a above. This substance binds to hexokinase and prevents its ability to catalyze the reaction. E) covalent modification 3) An inactive form of an enzyme becomes active after being phosphorylated. 4) Pepsinogen becomes pepsin after being released into the lumen of the stomach. 5) In a series of enzymatic reactions, it is found that the product of the last reaction inhibits the first enzyme in the series of reactions.
Which parts belong to the central nervous system?
A) sensory neurons B) interneurons C) motor neurons D) effectors
Indicate whetherthe statements below are true or false. If a statement is false, explain why it is false
A. Neurotransmitters are small molecules released into the synaptic cleft after the fusion of synaptic vesicles with the presynaptic membrane. B. Action potentials are usually mediated by voltage-gated Ca2+ channels. C. Voltage-gated Na+ channels become automatically inactivated shortly after opening, which ensures that the action potential cannot move backward along the axon. D. Voltage-gated K+ channels also open immediately in response to local depolarization, reducing the magnitude of the action potential.