DNA is found in every cell of an organism. What subset of DNA changes would be most useful to molecular biologists to determine evolutionary relationships?

A) DNA changes that occur in genes specific to organisms in one kingdom
B) DNA changes in genes that are shared by a common ancestor
C) DNA changes in genes that occur in body cells and cannot be passed to offspring
D) DNA changes in genes that do not generally code for any function


B

Biology & Microbiology

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Through what process is O2 transported from air in the lungs into the blood?

a. active transport b. simple diffusion c. facilitated diffusion d. osmosis e. active transport

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Which of the following aspects is NOT

characteristic of diatoms?

a. overlapping shell b. live in fresh water and cool seas c. silica composition d. flagella e. photosynthetic

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Substrate activation may involve

A) a change in enzyme conformation induced by substrate binding. B) accepting protons from the enzyme. C) formation of temporary covalent bonds. D) donation of protons to the enzyme. E) All of these are correct.

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Which of the following serves as the "translator" or intermediary between an mRNA codon and an amino acid?

A. siRNA B. snRNA C. rRNA D. snRNPs E. tRNA

Biology & Microbiology