Ambergris is produced by dolphins
Indicate whether the statement is true or false
F
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The point of connection between two sister chromatids, before anaphase II of meiosis separates them, is called the
A. centriole B. kinetochore. C. centromere. D. spindle apparatus. E. centrosome.
Generally speaking, vaccinations are effective in combating future infections because they induce the production of
A. helper T cells. B. neutrophils. C. prostaglandins. D. mutations in the host genome. E. memory cells.
Spiders use hydraulic pressure for all of the
following EXCEPT to a. oppose the contraction of their leg muscles. b. extend their hind legs outward. c. assist in jumping. d. pump blood into body tissues. e. compensate for their lack of opposing leg muscles.
Which of the following statements is true about vitamins?
A. Vitamins are organic nutrients that break down to form energy for the cell. B. Vitamins are enzymes that catalyze chemical reactions in cells. C. Vitamins are molecules that assist enzymes in chemical reactions or assist in energy-related pathways. D. Vitamins are nutrients that are directly metabolized through cellular respiration pathways, providing energy for the cell. E. Vitamins are molecules that lower the activation energy of chemical reactions, allowing them to proceed rapidly.