What is different from one DNA nucleotide to the next?
A. The base
B. The sugar molecule
C. The protein
D. The phosphate group
Answer: A
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Many patients who have a certain blood clotting disorder in which the blood clots too readily have a mutation in the promoter of a gene. This mutation most likely
A) deletes a gene for a clotting factor. B) blocks transcription of a clotting factor. C) increases susceptibility to a specific viral infection. D) increases the transcription rate of a particular clotting factor gene.
Which of the following contributes to subfertility?
A) Regular menstrual cycles B) High sperm counts C) Being under 30 years of age D) Oligospermia
Which are assemblages of abiotically produced polymers?
a. ribozymes b. stromatolites c. protobionts d. endosymbionts e. polyribosomes
A molecule that is a component of a ribosome is
A. DNA. B. tRNA. C. mRNA. D. rRNA.