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

Biology & Microbiology

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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.

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Which of the following contributes to subfertility?

A) Regular menstrual cycles B) High sperm counts C) Being under 30 years of age D) Oligospermia

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Which are assemblages of abiotically produced polymers?

a. ribozymes b. stromatolites c. protobionts d. endosymbionts e. polyribosomes

Biology & Microbiology

A molecule that is a component of a ribosome is 

A. DNA. B. tRNA. C. mRNA. D. rRNA.

Biology & Microbiology