Which method would be the MOST powerful approach to isolating a single mutant from a population of billions?
a. assay for the loss of function
b. replica plating
c. selection for a gain of function
d. screen for the mutant
Answer: C
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The single-factor crosses performed by Mendel support the observation that
A. the two alleles for a given gene are distributed randomly among an individual's gametes. B. the two alleles for a given gene are found within the same gamete. C. if the recessive alleles for two different genes are on the same chromosome, they will never be found within the same gamete. D. only the dominant alleles for a given trait are found in an organism's gametes. E. if the dominant alleles for two different genes are on different chromosomes, they will never be found within the same gamete.
Openings in leaves through which gases enter and exit are called:
a. mesophylls b. xylems c. rubiscos d. stomata e. phloems
Acetyl can be produced directly from
A. CoA. B. glucose. C. proteins. D. pyruvic acid.
Which statement regarding the nervous system is true?
A) Sensory neurons convey signals from the central nervous system (CNS) to sensory receptors. B) Motor neurons convey signals from the CNS to effector cells. C) The peripheral nervous system (PNS) is composed entirely of nerves. D) The CNS includes the brain and peripheral nerves.