How many chromosomes and chromatics would a typical human cell have after duplication but before mitosis?
A. 46 chromosomes, 46 sister chromatids
B. 23 chromosomes, 23 sister chromatids
C. 46 chromosomes, 92 sister chromatids
D. 23 chromosomes, 46 sister chromatids
Answer: C
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Why do you think that endangered plants and some animals receive very little attention from
the public?
a. The organisms are not strong enough to survive. b. People are more apt to be concerned about the status of “cute” animal populations. c. They are not important members of a food web. d. They are not well suited to the environment.
How does diffusion limit size in cells?
a. Once a cell attains a particular size, the transport proteins in the cell membrane stop functioning and diffusion fails. b. The size of the cell dictates the size of lipids in the membrane. If the lipids become too large, diffusion becomes slower and the cells can starve. c. As cells increase in size, the surface-to-volume ratio decreases and diffusion becomes too inefficient to provide nutrients and waste disposal from the cell. d. Cells that are of a particular size, or greater, enter a state of torpor and growth slows until the cell shrinks again.
A DNA molecule has four "ends"— two on each of the two polynucleotide strands. How many of
these ends are phosphate groups? Fill in the blank(s) with the appropriate word(s).
Why don't many successions reach the climax community status?
A. because the species within the system don't interact constantly B. because species go extinct C. because animals always die D. because the local climate keeps changing and human activities have an impact