The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in the introns between their genomes.
B. differences in gene expression between species.
C. the vast differences in exons between their genomes.
D. the junk DNA of humans contains important sequences not present in chimps.
Answer: B
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Because archaeons lack peptidoglycan in their cell walls
A. some have an outer layer of complex polysaccharide. B. they must always be grown in isotonic medium. C. some have an outer layer of protein. D. some have an outer layer of complex polysaccharide and some have an outer layer of protein.
What might be a reason for the accumulation of improperly folded protein complexes in the bacterial cell cytoplasm following translation?
A. A problem exists with the functioning of molecular chaperones B. Polysomes are forming on the mRNA C. The cell is synthesizing proteins too rapidly D. The proteins are being transcribed but not translated
If you teach your dog to sit by giving him a treat for every correct response, this is an example of
A) operant conditioning. B) social learning. C) habituation. D) innate behavior. E) insight learning.
Which of the following species is both a keystone species and a flagship species?
A. grizzly bear B. alligator C. dolphin D. beaver E. panda