Which of the following hormones is regulated by a positive feedback mechanism?
A) oxytocin
B) slow-acting hormone that works through a second-messenger system
C) TSH
D) thyroxine
E) TRH
Ans: A) oxytocin
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Which of the following is associated with the sense of touch?
A. Dendritic cells B. Keratinocytes C. Melanocytes D. Fibroblasts E. Tactile cells
The fastest rate of mitosis happens in the __________.
A. stratum basale B. stratum spinosum C. stratum granulosum D. stratum lucidum E. stratum corneum
Which of the following statements about brain size is true?
a. Elephants have a larger number of neurons in their brain than humans do. b. Octopods have a larger number of neurons in their brains than humans do. c. The neurons in human brains are larger than the neurons in other primates' brains. d. The brains of leaf-eating primates are larger than the brains of fruit-eating primates. e. The ratio of brain size to body size is larger in baleen whales than in dolphins.
When homologous replicated chromosomes pair up during meiosis, they form a
A. sister chromatid. B. centromere. C. single-stranded chromosome. D. tetrad.