Which of the following is directly involved in maintaining the blood volume?
a) Anterior Pituitary Lobe
b) Posterior Pituitary Lobe
c) None of the above
Ans: b) Posterior Pituitary Lobe
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Kinesin motor proteins use ATP energy to:
A. carry vesicles along a microtubule within a cell in a minus-to-plus direction. B. carry vesicles along a microfilament within a cell in a minus-to-plus direction. C. carry vesicles along a microtubule within a cell in a plus-to-minus direction. D. carry vesicles along a microfilament within a cell in a plus-to-minus direction. E. slide along microfilaments to contract muscle cells.
In order to study a cell at lower temperatures, a researcher must artificially increase its membrane fluidity. What would be a reasonable strategy for increasing plasma membrane fluidity at low temperatures?
A. decrease the composition of cholesterol in the plasma membrane B. increase the composition of phospholipids with saturated fatty acid chains C. decrease the composition of phospholipids with unsaturated fatty acid chains D. decrease the length of the phospholipid fatty acyl tail. E. All of the above strategies are reasonable
In a developing embryo, different cells begin to transcribe different master genes, depending on where they fall within a gradient of ________
a. protein products of embryonic mRNAs b. homeodomains c. temperature d. protein products of maternal mRNAs
An examples of a plant disease caused by an ascomycete is:
a. a microsporidial infection. b. corn smut. c. stem rust of wheat. d. histoplasmosis. e. chestnut blight.