Which of the following is a correct association?
A) kinase activity and the addition of a tyrosine
B) phosphodiesterase activity and the removal of phosphate groups
C) GTPase activity and hydrolysis of GTP to GDP
D) adenylyl cyclase activity and the conversion of cAMP to AMP
C
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Hox genes are known to be important for: (check all that apply)
_____ spatial patterning. _____ apoptosis. _____ cell metabolism. _____ cell-cell adhesion.
Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.
Neurospora is an ideal organism to study the effects of genetic mutations because of several reasons. What is one of
these? a. Neurospora is a small mammal. b. Neurospora grows as a diploid organism. c. Neurospora requires a medium supplemented with only a few nutrients that it cannot manufacture on its own. d. Neurospora mutant strains that cannot make a particular amino acid can still grow if that amino acid is added to the growth medium. e. Neurospora contains homologous chromosomes that are easily viewed with a light microscope
The cell walls of eukaryotes are usually composed of
A. peptidoglycan B. polysaccharides C. teichoic acid D. mycolic acid E. minerals