Which of the following is/are true about enzymes?
A. Enzymes are proteins that can be denatured by changes in pH or temperature.
B. Enzymes are catalysts that speed up reactions.
C. Enzymes are highly specific for the substrates they react with and catalyze only one or a limited set of possible reactions with those substrates.
D. All of the choices are correct.
Answer: D
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What would the result be if a drug that blocks the action of polymerase was introduced into a virus-infected organism?
A) The virus would not be able to enter new host cells. B) The viral proteins would not be made and the virus would not be able to reproduce. C) The newly formed virions (virus particles) would be unable to leave the host cell. D) Viral proteins and viral DNA particles would not be able to be assembled.
True or false: Many facultative mutualisms probably began as obligate relationships
A. true B. false
Since the hepatic portal vein empties into the liver, it is able to control the amount of _________ in the blood.
A. alcohol and drugs B. toxins, pesticides, and carcinogens C. glucose D. glucose, alcohol, and drugs E. glucose, alcohol, drugs, toxins, pesticides, and carcinogens
In a cell in which 2n = 6, the independent assortment of chromosomes during meiosis can by itself give rise to ________ genetically different gametes.
A) two B) four C) five D) six E) eight