In nature, how does an ectothermic animal maintain a constant body temperature on a cold day?
A) by basking in a sunny location
B) by increasing its rate of metabolism without basking
C) by eating more food, which creates heat as it's burned for energy
D) by shivering
A
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that requires the presence of a small double-stranded nucleic acid primer to catalyze the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes to the DNA and keeps the replication fork open.
Fraternal twins (dizygotic) result from the fertilization of
A. two eggs and two sperm. B. two eggs and one sperm. C. one egg and two sperm. D. one egg and one sperm. E. two eggs and one sperm OR one egg and two sperm.
What is the difference between NAD+ and NADH?
A.) NADH is involved in biosynthetic reactions B.) NADH carries an extra proton and two high energy electrons C.) NADH carries an extra phophate group D.) NADH is an electron acceptor, whereas NAD+ is an electron donor E.) NADH is the oxidized form, while NAD+ is the reduced form
The electron shells of atoms hold eight electrons each
Indicate whether the statement is true or false