The primary role of oxygen in cellular respiration is to
A) yield energy in the form of ATP as it is passed down the respiratory chain.
B) act as an acceptor for electrons and hydrogen, forming water.
C) combine with carbon, forming CO2.
D) combine with lactate, forming pyruvate.
E) catalyze the reactions of glycolysis.
Ans: B) act as an acceptor for electrons and hydrogen, forming water.
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You discover a bacteria species in a deep ocean sample that can turn olive oil into pure gold. The bacteria do not replicate well at sea level, and one night all of your "Golden" bacteria die. What can you do to possibly retrieve the gold-making gene from the dead Golden bacteria?
A. Transform a live bacterial strain with the Golden bacteria's DNA. B. Transduce a live bacterial strain with the Golden bacteria's DNA. C. Conjugate a live bacterial strain with the Golden bacteria. D. Transduce the Golden bacteria and then infect a live strain of bacteria with the transducing virus. E. There is nothing you can do because the cells are dead. You will have to search the ocean and hope to find the elusive bacteria again.
Which DNA mutation might cause a change in the amino acid sequence of the encoded protein?
a. insertion of one additional nucleotide b. neutral c. a mistake by RNA polymerase during DNA replication d. addition of a chromosome e. loss of a chromosome
Which of the following is a feature of prokaryotic cells but NOT eukaryotic cells?
A) pili B) cell wall C) flagella D) DNA
Which of the following foods is the best source of omega-3 fatty acids?
a. fatty fish b. peanut butter and jelly c. lard and shortenings d. beef and other red meats