Relative to the mRNA, which of the following moves during translocation?
a. attached tRNAs and the ribosome
b. attached tRNAs and the polypeptide chain
c. the ribosome only
d. the ribosome and the polypeptide chain
e. the polypeptide chain only
C
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Which of the following is a correct description of the fate of the germ layers?
A) The mesoderm gives rise to the notochord. B) The endoderm gives rise to the hair follicles. C) The ectoderm gives rise to the liver. D) The mesoderm gives rise to the lungs.
Which of the following statements in TRUE?
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. B. Euchromatin, found in interphase cells, is readily visible and easily viewed. C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms. D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin. E. All choices are correct.
What is an advantage conferred to fish by possession of a hinged jaw?
a. additional protection for the brain b. ability to communicate with other fish c. increased mating opportunities d. ability to grasp and tear food
A cell may meet the need for large quantities of a specific protein by all of the following EXCEPT :
a. continuously synthesizing the mRNA molecule that specifies that protein. b. increasing the half-life of the mRNA that specifies the protein. c. having multiple copies of the gene that codes for that protein. d. amplifying protein genes by DNA replication e. inhibition of DNA synthesis