Adding ____ groups to histones tightens the DNA and prevents transcription.
A) promoter
B) methyl
C) operator
D) acetyl
E) carboxylic acid.
Answer: B) methyl
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Which structure carries sperm into the prostate gland?
a. urethra b. vas deferens c. ejaculatory duct d. testes e. scrotum
An alien from another planet landed on earth. He is fascinated by cars and is determined to figure out how they work. He decides to disassemble one of them and examine each part independently. He removes one of the tires and proceeds to learn all he can about the tire. He then removes one of the headlights and proceeds to learn all he can about the headlight. What type of approach is this alien taking to learn about the car?
A. deductive reasoning B. emergent properties C. reductionism D. inductive reasoning
Which of the following statements is FALSE?
A) Salts readily dissolve in water. B) Water molecules are formed by hydrolysis. C) Water freezes from the top down. D) Water is formed as a part of a dehydration synthesis reaction. E) Water is a polar molecule.
A potential drug for the treatment of prion disease would be
a. a protease because prions are made only of protein. b. a ribonuclease because prions are made only of nucleic acid. c. a nucleoside inhibitor to prevent formation of new nucleotides. d. none of the above.