Tissues that are metabolically active and utilize large amounts of energy would be rich in
A. ribosomes.
B. lysosomes.
C. smooth endoplasmic reticulum.
D. mitochondria.
E. contractile vacuoles.
D. mitochondria
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Proto-oncogenes can change into oncogenes that cause cancer. Which of the following best explains the presence of these potential time bombs in eukaryotic cells?
A) Proto-oncogenes first arose from viral infections. B) Proto-oncogenes normally help regulate cell division. C) Proto-oncogenes are genetic "junk." D) Proto-oncogenes are mutant versions of normal genes. E) Cells produce proto-oncogenes as they age. Answer: B
The most important ion in controlling the movement of water into and out of the guard cells is
A. sodium. B. hydrogen. C. carbon. D. nitrogen. E. potassium.
Conjugation in most ciliates involves a series of steps that leads to increased genetic diversity. Which one of the following choices is not one of those steps?
A. sexual reproduction B. meiosis of a haploid nucleus C. mitosis of a haploid nucleus D. mitosis of a diploid nucleus E. meiosis of a diploid nucleus
A year ago, Kurt lost 30 pounds quite rapidly by severely restricting his calories. Over the months following, he has regained 25 of those pounds. Kurt again cuts radically back on his calorie intake to lose the regained weight. This time, he is having
more difficulty. What has happened to his body composition and his metabolism to create this difficulty? What will be an ideal response?