The yeast MAT locus transcription factor, Mcm1, is produced by:
A. haploid a cells.
B. haploid ? cells.
C. diploid a/?cells.
D. all haploid and diploid cells.
D
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Activator proteins in prokaryotes experience shape changes in the presence or absence of small molecules. As a consequence: (Select all correct choices)
A. they may activate genes needed only when such a small molecule is present in the cell. B. they may activate genes necessary to synthesize a specific small molecule. C. they are unable to act alone.
A modification that occurs to a nuclear gene that alters gene expression without modifying the DNA sequence is called _______ inheritance
A. extranuclear B. cytoplasmic C. maternal effect D. epigenetic E. nuclear
What was the basic problem with the Miller-
Urey early atmosphere experiments?
a. there was no lightning on the early Earth b. there was no hydrogen gas in Earth’s early atmosphere c. they used oxygen gas which was not present in Earth’s early atmosphere d. the mixture of gases they used was not representative of Earth’s early atmosphere e. more than one of these is correct
Mucins in saliva are used to
a. digest starch. b. digest fats. c. digest proteins. d. bind food together to from a bolus. e. maintain the pH of the mouth.