Molecular clocks are based on _____ mutations

A. advantageous
B. lethal
C. deleterious

D. neutral


D

Biology & Microbiology

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In animals, meiosis results directly in gamete production, while in plants spores are produced. How are the gametes produced in the life cycle of a plant?

What will be an ideal response?

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The tough, two-layered sac of connective tissue that holds the heart is called the ________

a. ventricle b. atrium c. myocardium d. pericardium

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Which of the following are the respiratory openings in insects?

a. spiracles b. trachea c. chitins d. cephalothorax

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Cells that have the FasL molecule

a. must also possess the Fas protein. b. must be cytotoxic T cells. c. must be melanocytes. d. will attack each other. e. will attack cells that have the Fas protein.

Biology & Microbiology