Which statement about Ras proteins is false?
a. They are G proteins.
b. They include MAP kinases.
c. They are active when bound to GTP.
d. They are inactivated when phosphorylated.
e. They are activated by tyrosine kinase receptors
d
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Aging may be attributed to
a. genetics. b. free radical damage. c. a decline in DNA repair mechanisms. d. changes in structural proteins. e. all of these.
The precursor digestive enzyme secreted by the stomach is ____
a. pepsinogen b. amylase c. HCl d. pepsin e. gastrin
Why is only one strand of DNA transcribed into mRNA?
a. Because mRNA is only required in small quantities. b. Because transcribing both DNA strands would produce different amino acid sequences. c. Because the other strand would produce the same amino acid sequence in reverse order. d. Because all genes are located on the same DNA strand, while the other strand acts as protection. e. Because the other strand is transcribed directly into amino acids.
The Y chromosome is present in only one copy in males, and therefore most of the genes it contains are effectively haploid
Although there is recombination between the pseudoautosomal regions of the X and Y, there is not a homologous section for large parts of the Y chromosome. How are the male-specific genes prevented from accumulating mutations and becoming nonfunctional? What will be an ideal response?