Which of the following is NOT a surviving phylum of gymnosperms?
A. Cycadophyta
B. Ginkgophyta
C. Gnetophyta
D. Lycophyta
E. Coniferophyta
D. Lycophyta
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Substances that release ions when dissolved in water and conduct electricity are ________.
A. electrons B. solvents C. nonpolar D. electrolytes E. covalent
About 2/3 of a shark's brain is used for:
a. control of body movement. b. processing electrical currents from the water. c. olfaction. d. vision. e. processing water pressure differences.
The production and secretion of testosterone depends on the secretion of three other hormones; GnRH is secreted by the ________, and FSH and LH are secreted by the ________
A) hypothalamus; anterior pituitary gland B) testes; scrotum C) posterior pituitary gland; anterior pituitary gland D) seminal vesicle; prostate gland E) posterior pituitary gland; hypothalamus
If chimpanzees and human genomes differ only about 1.3% at the level of DNA base pairs, then how can we explain the dramatic differences in appearance, behavior, cultures, etc., between humans and chimps?
a. There is a correlation between increased rates of divergence with known functions of alleles in humans and chimps. b. Natural selection has been acting on clusters of genes associated with both survival and repro-duction in humans and chimps. c. Important differences exist in the expression of genes in humans and chimps. d. Two of the above can explain the differences.