Genes are said to be linked when:
A. they lie on the same chromosome.
B. they lie on the same chromosome and are greater than 50 map units apart.
C. they lie on the same chromosome and are less than 50 map units apart.
D. they are alleles of the same gene.
E. None of these choices are correct.
C
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Which structure is derived from an ancestral air-breathing lung in ray-finned fishes and is used to increase buoyancy?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
How does a plant's cuticle allow it to live on land?
A. By increasing structural support B. By preventing the gametes from drying out C. By preventing water loss D. By absorbing nutrients from the soil
The results of the experiments of Avery and his colleagues indicate that
A. proteins are antigens. B. proteins transfer genetic information. C. capsule formation is mediated by RNA. D. DNA is the transforming material. E. DNA replication is semiconservative.
In the process of translation,
a. rRNA is synthesized with sequences complementary to those of tRNA b. nucleotide sequences of tRNA are established c. a strand of mRNA is formed with nucleotide sequences complementary to those of DNA d. a polypeptide is formed in response to the rRNA nucleotide sequence e. a polypeptide is formed as dictated by the nucleotide sequence in mRNA