In 1952, Hershey and Chase confirmed Avery's (1944) conclusion that
A. each DNA molecule is composed of two strands that are twisted into a double helix.
B. proteins are the repositories for hereditary information.
C. the replication of DNA is semiconservative.
D. RNA is the repository for hereditary information.
E. DNA is the repository for hereditary information.
Answer: E
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You are asked to determine whether an unknown tissue specimen comes from a plant or an animal
Closer inspection with an electron microscope reveals that the cells are connected by small openings lined by extensions of the cell membrane and containing tubules connecting the endomembrane systems of adjacent cells. Which of the following conclusions can be drawn from your observations? A. The openings are plasmodesmata, so the tissue must come from a plant. B. The openings are plasmodesmata, so the tissue must come from an animal. C. The openings are gap junctions, so the tissue must come from a plant. D. The openings are gap junctions, so the tissue must come from an animal. E. The openings could be either gap junctions or plasmodesmata, so it cannot be determined whether the tissue came from a plant or an animal.
A nearsighted woman (Nn) with hazel eyes (Hh) marries a man with normal vision and hazel eyes (Hh). Their three children all have blue eyes and normal vision. What is the probability that their next child will have blue eyes and be nearsighted?
A. 1/4 B. 1/2 C. 3/8 D. 1/8 E. 5/8
Which type of plant hormone promotes fruit ripening?
a. ethylene b. jasmonates c. gibberellins d. brassinosteroids e. abscisic acid
The best terms for a fish whose body temperature varied between 4oC during the day when it is in deep, cold ocean waters and 26oC during the night when it comes to the surface to feed would be
A. ectothermic and endothermic. B. endothermic and homeothermic. C. ectothermic and homeothermic. D. ectothermic and heterothermic. E. endothermic and heterothermic.