A hypothesis currently getting a lot of attention concerning the origin of biological molecules is that they originated
____.
a. in hot springs
b. near volcanoes
c. near hydrothermal oceanic vents
d. in salt lakes
e. in tidal pools
ANSWER: c
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After some time, the tip of a plant that has been forced into a horizontal position grows upward. This phenomenon is related to _____
A) calcium release from the endoplasmic reticulum of shaded cells B) whether the plant is in the northern or southern hemisphere C) gibberellin production by stems D) auxin production in cells receiving red light E) auxin movement toward the lower side of the stem
Many seeds are capable of surviving in a dormant or quiescent state for many years, or even centuries. Such seeds are not usually damaged by environmental extremes that would kill most other organisms
What main adaptation prevents the seeds from germinating before they are dispersed, and allows them to survive until environmental conditions are favorable for germination and seedling growth? A) A seed coat B) Two cotyledons C) A large quantity of stored nutrients D) Desiccation to 2-20 percent water E) Double fertilization
A key is placed into a keyhole then turned and the door opens. When considering the components of cell signaling, the action of turning the key would best correspond to ______.
A. signal transduction that occurs when the receptor binds the hormone B. the cell response that occurs when the receptor binds the hormone C. the concentration of the hormone D. conformational change in the receptor once bound to the hormone E. the binding site of the receptor
What is the purpose of using bacteria to study the function of myoglobin?
a. Bacterial myoglobin is similar to mammal myoglobin. b. Bacteria genes are easier to clone than mammal genes. c. Bacteria can express a myoglobin gene and myoglobin molecules can be produced in quantity. d. Bacterial reproduction rates. e. Rates of evolutionary change in bacteria.