What is a ribosome made of?
a. tRNA and rRNA
b. tRNA, rRNA, and mRNA
c. rRNA and proteins
d. rRNA and mRNA
Answer: c. rRNA and proteins
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With regard to the semipermeable nature of the plasma membrane, which of the following would readily cross without the aid of a transport protein?
A) calcium ions B) glucose C) water D) amino acids E) DNA
A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?
A. Glucose becomes more chemically reactive inside a cell. B. The water is activated by the presence of living cells. C. Enzymes in the cell catalyze the breakdown of glucose. D. Living cells make the water warmer, speeding up the reaction. E. Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells. F. Cells use energy to break down glucose.
If a human body has an insufficient supply of oxygen, the skeletal muscle cells may switch from cellular respiration to which of the following?
a. alcoholic fermentation b. photosynthesis c. lactic acid fermentation d. metabolism
In what form do animal cells store glucose?
a) glucogen b) amylose c) glycogen d) agarose e) amylopectin