The data below suggest that the proportion of sexuals in snails increases with parasite load. Is this the only possible explanation for the observed differences in the degree of sexual reproduction?
a. Yes, the data points show a clear correlation between parasite load and sexual reproduction.
b. Yes, factors other than parasites are unlikely to fine-tune the degree of sexual reproduction in natural populations.
c. No, lakes and streams differ in their average parasite load.
d. No, habitat differences between lakes and streams may be responsible for different levels of sexual reproduction.
D
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The Krebs cycle occurs in the mitochondria. There are nine biochemical reactions involved in the Krebs cycle, and they are highly ordered. Select the correct order. (Note: These are abbreviated and do not show NAD, ADP, ATP, or FAD.)
A. acetyl-CoA joins the Kreb cycle and unites with oxaloacetate ®forming citrate ®which forms beta-ketoglutarate ® which forms succinyl-CoA ® which forms succinate ® which forms fumarate ® which forms malate ® which forms oxaloacetate B. acetyl-CoA joins the Kreb cycle and unites with oxaloacetate ®forming citrate ®which forms alpha-ketoglutarate ® which forms succinyl-CoA ® which forms succinate ® which forms malate ® which forms fumarate ® which forms oxaloacetate C. acetyl-CoA joins the Kreb cycle and unites with oxaloacetate ®which forms alpha-ketoglutarate ® forming citrate ® which forms succinyl-CoA ® which forms succinate ® which forms fumarate ® which forms malate ® which forms oxaloacetate D. acetyl-CoA joins the Kreb cycle and unites with oxaloacetate ®forming citrate ®which forms alpha-ketoglutarate ® which forms succinyl-CoA ® which forms succinate ® which forms fumarate ® which forms malate ® which forms oxaloacetate
Which of the following is an advantage of asexual reproduction?
a. It produces genetically diverse offspring. b. Large numbers of offspring can be produced quickly. c. Offspring are more likely to survive in a changing environment. d. Organisms have both male and female reproductive systems.
The antidiuretic hormone
a. controls levels of GH. b. influences levels of LH. c. influences levels of FSH. d. reduces urine output. e. causes contractions of the uterus
Match the following prefixes with their relationship to the standard base unit (g, m, L):
Centi A) 1/100 B) 1/1,000,000 C) 1000 D) 1/1000