Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is
A. hypotonic.
B. turgid.
C. isotonic.
D. saturated.
E. hypertonic.
A. hypotonic.
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In corn, having ligules (L) is dominant to liguleless (l), and green leaves (G) is dominant to white leaves (g). If a testcross is performed with a dihybrid plant with ligules and green leaves, what proportion of the progeny would be green and liguleless?
A) 1/16 B) 1/8 C) 1/4 D) 1/2 E) Cannot be determined
Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism. As a consequence,
they
a. are sterile. b. have no proofreading during DNA replication. c. cannot join the Okazaki fragments produced during DNA replication. d. easily develop skin cancer when exposed to sunlight. e. lose part of the DNA on the ends of chromosomes during each round of DNA replication.
Conifers produce
A. only seeds in cones. B. only flowers. C. both seeds and pollen in cones. D. pollen in flowers and seeds in cones. E. only pollen in cones.
A fatty acid that contains only single bonds between the carbon atoms is considered
A. a cholestrol. B. unsaturated. C. trans unsaturated. D. saturated. E. a steroid.