In which respect do spermatogenesis and oogenesis differ?
A) Spermatogenesis occurs in the epididymis, whereas oogenesis occurs in the ovary.
B) The number of gametes produced is different.
C) The number of meiotic divisions is different.
D) The number of chromosomes in gametes is different.
B
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Why are mitochondria so prevalent in skeletal muscle?
A) They give the muscle enough elasticity to contract. B) They are needed to repair damaged tissue that accumulates during exercise. C) They are needed to provide energy for muscle contraction. D) Bones and muscles require a great deal of energy to prevent them from separating. E) The flow of blood is greatest in skeletal muscle.
Why is ubiquitin nicknamed the "doom tag"?
a. When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein and destroys it. b. When ubiquitin binds to a target protein, the complex is sent to the proteasome and the complex is hydrolyzed to amino acids. c. If a cell is deficient in ubiquitin, the cell will die. d. High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to premature cell death. e. Ubiquitin catalyzes the conversion of pepsinogen to active pepsin, an enzyme vital to protein digestion in the stomach of mammals. A lack of ubiquitin in the stomach causes an organism to starve.
Current analysis indicates that less than 2% of the human genome codes for proteins
Based on the systems approach employed by the ENCODE project, what percentage of the genome is estimated to contain functional elements (includes functional RNAs and regulatory sequences)? A) Less than 2% B) About 50% C) At least 80% D) 100%
Which of the following storage methods do not inhibit bacterial growth?
A) Preventing contact between food and rats B) Allowing contact between food and flies C) Temperature (either hot or cold) D) Chemical preservatives