RNA differs from DNA in that
A. RNA contains ribose.
B. RNA is usually single stranded.
C. RNA contains uracil.
D. All of the answer choices are correct.
E. Some RNA molecules can catalyze bond formation.
D. All of the answer choices are correct.
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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.
Which embryonic tissue is incorrectly associated
with its derivative? a. skin; mesoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; ectoderm
Members of the class Bivalvia:A
have gills that secrete the shell. B. have a mantle that may form pearls. C. are all sessile. D. all have a radula. E. have a broad foot used for locomotion.
Which of the following statements about uric acid is true?
A) Uric acid requires less water to excrete than does urea. B) Uric acid is more soluble in water than urea. C) The darker material in bird droppings is mostly uric acid. D) Uric acid is more toxic than ammonia.