The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins.
B. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.
C. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins.
D. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.
Answer: D
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The spindle apparatus is made of
a. Golgi bodies. b. nucleoprotein. c. endoplasmic reticulum. d. microtubules. e. chromatids.
The process by which chromosomes fail to
separate during meiosis is called
a. aneuploidy. b. trisomy. c. monosomy. d. nondisjunction. e. polyploidy
During carrier-mediated facilitated diffusion, the cell will increase its transport maximum if the concentration gradient is increased.
a. true b. false
Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of DNA up to approximately how many times in an hour?
a. ?200,000 b. ?1,000 c. ?10 d. ?2,000,000 e. ?10,000