In humans, fertilization usually occurs in the ________
Fill in the blank(s) with correct word
oviduct
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What is the general effect of humans on the nitrogen (N) and phosphorus (P) cycles?
A. We greatly increase levels of N and P through the burning of fossil fuels. B. We cause levels of N and P in the environment to drop through our farming practices. C. We overuse N and P in our farming practices and cause high levels to enter the natural environment. D. We deplete levels of N and P in our farming practices and do not replenish them.
The observation that most aquatic vertebrates (e.g., fish, penguins, and whales) have streamlined bodies and fins or flippers for steering are a result of
A. artificial selection. B. convergent evolution. C. analogous selection. D. vestigial selection. E. sexual evolution.
Different modification of the histone have different effects on gene expression. For instance, the ninth amino acid of histone 3 is a lysine (H3K9 ) can be acetylated once or methylated up to three times. Which of the following is true regarding H3K9
modification? A) If H3K9 is acetylated, then the gene will be repressed. B) If H3K9 has a single methyl group, then the gene will be repressed. C) If H3K9 has two methyl groups, then the gene will be activated. D) If H3K9 has three methyl groups, it is maximally activated compared to only having one methyl group. E) If H3K9 has three methyl groups, then the gene will be repressed.
Which of the following is not an issue for coastal areas?
A. desertification B. erosion C. loss of buffer zone for storms D. pollution E. loss of habitat for organisms