The chromosomal abnormality Calvin Bridges observed as a characteristic of "primary exceptionals" is a result of:

A. mutation.
B. nondisjunction.
C. chiasmata.
D. recombination.
E. linkage.


B

Biology & Microbiology

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disorders?

What will be an ideal response?

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Sensory receptors:a

produce internal environmental stimuli. b. convert stimulus energy to electrical energy. c. maintain a constantly hyperpolarized plasma membrane. d. produce a small amount of energy on a continual basis. e. produce action potentials of varying amplitudes in response to stimuli of differing intensities.

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What is the key characteristic that defines the Ecdysozoa clade?

a. The animal molts. b. The animal is a deuterostome. c. The animal has motile larvae. d. The animal has bilateral symmetry. e. The animal develops three tissue layers.

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Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model for __________, which may have preceded cells.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology