A genetic X-linked condition in which females exhibit patches of lighter and darker pigmented skin is
a. psoriasis.
b. vitiligo.
c. ectodermal neoplasia.
d. hydrous ectodermal neoplasia.
e. incontinentia pigmenti.
E
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"Double fertilization" produces nutrient tissue
by the union of a. two egg nuclei and one sperm nucleus. b. two sperm nuclei and one egg nucleus. c. two sperm nuclei and two egg nuclei. d. one sperm nucleus and endosperm mother cell nuclei. e. two sperm nuclei and one endosperm mother cell nucleus
Most plants are known as photoheterotrophs. Indicate whether the statement is true or false
Some nerves are myelinated, and others are not. Myelinated nerves send signals faster than unmyelinated neurons. Draw two neurons of equal length, and wrap segments of myelin along one. Be careful to leave spaces for the nodes of Ranvier. Now, measure
the exposed axons of each, and total up the distance. Describe why the myelinated neurons send signals faster. What will be an ideal response?
Induction of the lac operon is rapidly reversed because
a. the products of lactose metabolism are corepressors. b. as inducer levels drop, the repressor is rapidly reoriented to the operator. c. its mRNA is rapidly degraded. d. above a certain concentration, the inducer becomes a corepressor. e. there is rapid synthesis of new repressor.