Consider the structure and function of DNA. Which of the following statements is true?
A. Because DNA contains carbohydrates, it provides structural support to the cells.
B. The phosphodiester bonds that stabilize the association of the two strands are easily broken and reformed.
C. If the sequence of one DNA strand is known, then the sequence of the other strand can be determined.
D. Since DNA is made of phosphate groups that are ionized, it could easily pass through a cell membrane.
Answer C
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The gametophyte is green and nutritionally independent in
A. mosses, liverworts, and ferns. B. angiosperms. C. gymnosperms. D. tracheophytes. E. seed plants.
Larvae and eggs are developmental forms of ________.
A. protozoa B. helminths C. algae D. yeasts E. fungi
A fasting animal whose energy needs exceed those provided in its diet draws on its stored resources in which order?
A) fat, then glycogen, then protein B) glycogen, then protein, then fat C) liver glycogen, then muscle glycogen, then fat D) muscle glycogen, then fat, then liver glycogen
Radioactive isotopes are used in dating materials from the distant past. Which of the following statements about radioactive dating techniques is true?
A. It gives the general ages of rock strata. (±1 million years). B. It uses a technique in which the degree of radioactive decay is measured, the younger the rock the more radioactive decay. C. It gives exact ages of rock strata. (± 1 year). D. It uses a technique in which the degree of radioactive decay is measured, the older the rock the more radioactive decay. E. It does not work well with fossil remains that have not absorbed radiation.