What special feature of the ovum is facilitated by the production of polar bodies?
A. Triploidy
B. Large size of the nucleus
C. Large size of the cell
D. Extra layers of plasma membrane
Answer: C
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Which of the following statements is false?
a. Enzymes are highly specific and act on chemicals called substrates. b. Enzymes act as catalysts and speed up chemical reactions within cells. c. Most enzymes work best under high salt conditions. d. Most enzymes are proteins. e. Enzymes can become deactivated by high fevers
Which of the photographs in the above figure
represents the seedless vascular plants? a. moss b. fern c. conifer d. monocot e. all of these
Which statement about the internal biological clock is false?
a. It is known as a circadian rhythm. b. It relates to the opening and closing of stomata. c. It includes the sleep movements observed in some plants, such as beans. d. It may involve both phytochrome and cryptochrome. e. It disappears totally if it is not reset by the rising and setting sun.
Cytochrome c is a respiratory pigment found in the mitochondria of eukaryotes. Compared with some other proteins, it has changed very slowly over long periods of time. Why?
What will be an ideal response?