Which of the following is NOT a characteristic of phospholipids?
A. they are found in cellular membranes.
B. they can form micelles and bilayers.
C. they contain fatty acids that associate with water.
D. they contain a hydrophilic phosphate "head".
E. they contain two fatty acids and a phosphate functional group.
Answer: C
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The primary transcripts in eukaryotes are most accurately described as
A. composed of RNA polymerase and associated histones. B. having the exons removed and the introns retained for translation. C. a faithful copy of the entire gene including exons and introns. D. an exact copy of the gene, but the introns have been removed. E. an RNA copy, but the non-coding exons and introns have been removed.
Each end of a eukaryotic chromosome is capped by a repeating DNA sequence called the ____
Fill in the blank with the appropriate word.
Fertility is impaired when a male’s sperm count drops below ____ sperm per milliliter of semen, and the male is
considered sterile if his sperm count drops below ____ sperm per milliliter of semen. a. 500 million; 200 million b. 100 million; 50 million c. 35 million; 20 million d. 2 million; 1 million e. 500,000; 100,000
What is the structure through which water enters the water vascular system of a sea star?
a. ampulla b. radial canal c. madreporite d. ring canal