Eyes are sensory organs that hold:
a. chemoreceptors
b. mechanoreceptors
c. photoreceptors
d. nociceptors
e. olfactory receptors
c
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The coelacanth is found in the class:a
Dipnoi. b. Actinistia. c. Placoderms. d. Cephalochordata. e. Urochordata
The attraction between water molecules is called a:
a) ionic bond b) polar covalent bond c) hydrogen bond d) neutral bond e) nonpolar covalent bond f) peptide bond
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body. Assume that a cross is made between a fly with normal wings and a hairy
body and a fly with vestigial wings and normal body hair. The wild-type F1 flies were crossed among each other to produce 1024 offspring. Which phenotypes would you expect among the 1024 offspring, and how many of each phenotype would you expect? A) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (192), vestigial (256), hairy (64), and vestigial hairy (192). B) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (576), vestigial (192), hairy (192), and vestigial hairy (64). C) All wild type. D) All vestigial hairy. E) Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers expected: wild (256), vestigial (256), hairy (256), and vestigial hairy (256).
Which of the following occurs to transmit signals from one neuron to another?
a. Electrical signals cross the synapse. b. An action potential jumps the synapse. c. ATP starts an action potential in the postsynaptic cell. d. The presynaptic cell releases a neurotransmitter