In sporadic cases of retinoblastoma, how many gene mutations are thought to be necessary in the same cell for a tumor to develop?
A) one
B) two
C) four
D) six
E) insufficient information to answer this question
B
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Of the 13 essential vitamins, ____ are water soluble and ____ are fat soluble
a. 3; 10 b. 4; 9 c. 5; 8 d. 9; 4 e. 10; 3
Some prokaryotic and all eukaryotic cells use oxygen to harvest energy from food molecules. In which form is this energy available to power cellular work?
a. fat molecules b. glucose molecules c. ATP molecules d. heat and light e. NADH
Animal life underwent its greatest diversification during the ________, which began about ________ million years ago
A) Paleozoic era... 290 B) Paleozoic era... 540 C) Mesozoic era... 363 D) Mesozoic era... 245
Why do bacterial cells require calcium?
A. It makes strong bones. B. It stabilizes the ribosomes. C. It stabilizes the cell wall. D. It maintains cellular pH. E. It stabilizes the nucleoid.