Ticks can live on dogs, cats and other mammals. The ticks benefit but the mammal is harmed. This relationship is called
a) parasitism
b) commensalism
c) competition
d) mutualism
Ans: a) parasitism
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Vincristine is a cancer chemotherapy drug. It binds to tubulin dimers, inhibiting assembly of microtubules. Where do you predict that vincristine stops the cell cycle?
A. S phase B. Prophase C. Metaphase D. Telophase
Crossing over is one of the most important events in meiosis because
a. it produces new arrays of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. it is the mechanism through which twins are produced.
Which example represents a structural adaptation that an endotherm might make to maintain body temperature?
a. spraying oneself with water b. seeking shade under a plant c. increasing activity level d. having feathers e. shivering
Which of the following vitamins is fat-soluble and, consequently, can be stored in body fat?
A) biotin B) pantothenic acid C) niacin D) K