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
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What symptoms are shared by knockout mice with nonfunctional DvII genes and humans with certain psychiatric
disorders?
What will be an ideal response?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.
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.
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).