Many genes in the human genome are no longer expressed because mutations have introduced stop codons within the coding sequence or transposons have disrupted gene function. These genes are now considered
A. pseudogenes.
B. orthologs.
C. homologues.
D. paralogs.
Answer: A
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Which is true about prokaryotic (bacterial) RNA polymerase?
A. It is used during transcription. B. It does not require a primer. C. It has a detachable subunit, sigma factor, which recognizes the promoter. D. It reads the template in the 3'-5' direction. E. All of the choices are true.
Uncoating of viral nucleic acid
A. does not occur in bacteriophage multiplication. B. occurs during penetration in the multiplication cycle. C. involves enzymatic destruction of the capsid. D. occurs before replication. E. All of the choices are correct.
Which of the following is NOT a characteristic of an autosomal recessive trait?
A. All of the children of two affected individuals are affected. D. Every affected individual has at least one affected parent. B. If two individuals are heterozygous, the risk of having an affected child is 1:4. E. All of these are characteristic of an autosomal recessive trait. C. For rare traits, affected individuals have unaffected parents.
Some sharks and tunas possess a ________, a blood circulation system that allows them to keep internal temperatures higher than external temperatures
Fill in the blank(s) with correct word