New polypeptide chains for proteins are assembled on
1.Golgi bodies.
2.lysosomes.
3.ribosomes.
4.peroxisomes.
5.centrosomes.
3
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Which of the following statements about RNA polymerase in bacteria is INCORRECT?
A. It binds the promoter region of a gene. B. It is bound to a sigma factor during initiation of transcription. C. It synthesizes RNA. D. It catalyzes the addition of nucleotides to the 5?end of a growing RNA strand. E. It dissociates from the DNA at the terminator.
The scientist(s) who used X-ray diffraction to help reveal the geometric structure of DNA was/were
A. Wilkins and Franklin. B. Hershey and Chase. C. Avery and Macleod. D. Chargaff. E. Watson and Crick.
Elongation factors translocate the ribosome in the 3? direction by a distance of __________
A) one codon B) one nucleotide C) two nucleotides D) two codons E) three codons
Protecting the endangered whooping crane from extinction involved
A) captive breeding and reintroduction. B) collecting individuals from multiple small populations and combining them into a single large population. C) vaccinating the remaining population against plague. D) providing food during harsh winters.