Organize the sequence of structures through which sperm must pass upon ejaculation
1) urethra
2) ejaculatory duct
3) epididymis
4) vas deferens
a. 3 ? 2 ? 1 ? 4
b. 3 ? 4 ? 2 ? 1
c. 2 ? 3 ? 4 ? 1
d. 2 ? 4 ? 3 ? 1
e. 4 ? 3 ? 2 ? 1
B
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Five two-point crosses involving the four linked genes A, B, C, and D were performed in yeast with the following results:
AB × ab: 41% AB 39% ab 9% Ab 11% aB AC × ac: 45% AC 48% ac 4% Ac 4% aC BC × bc: 44% BC 44% bc 6% Bc 6% bC AD × ad: 48% AD 46% ad 3% Ad 3% aD BD × bd: 37% BD 37% bd 12% bD 13% Bd Which is the best map for these four genes? A. B 6mu A 4mu C 3mu D B. B 12mu C 8mu A 6mu D C. D 3mu A 4mu C 6mu B D. A 4mu C 6mu B 12mu D E. The data suggest that the genes are not linked.
In the carbon cycle, animals play a fundamental role by:
a. decreasing the amount of dissolved carbon dioxide. b. increasing the amount of dissolved carbon dioxide as a result of respiration. c. increasing the amount of dissolved carbon dioxide as a result of photosynthesis. d. decreasing the amount of plant biomass. e. decreasing it as a result of photosynthesis.
What are the issues around the use of biofuels as an alternative to fossil fuels?
What will be an ideal response?
How can prokaryotes be considered to be more successful on earth than humans?
a. prokaryotes are much more numerous and have more biomass b. prokaryotes occupy more diverse habitats c. prokaryotes are more diverse in metabolism d. only b and c are correct e. a, b and c are correct