When Hershey and Chase labeled viruses with radioactive phosphorus, they concluded that the virus injects DNA and

not protein into its host because ____.



a. most of the radioactive protein was inside the bacteria
b. most of the radioactive DNA was inside the bacteria
c. both radioactive DNA and protein were inside the bacteria
d. neither radioactive DNA nor protein were inside the bacteria
e. entire viruses were inside the bacteria


ANSWER: b

Biology & Microbiology

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Arrange the following electron carriers in the electron transport chain, based on their standard reduction potentials.Cytochroms a3(Fe3+) + e- ? Cytochrome a3 (Fe2+)   Eo (volts) = 0.35Ubiquinone + 2H+ + 2e- ? Ubiquinone H2                     Eo (volts) = 0.10Cytochrome a (Fe3+) + e- ? Cytochrome a (Fe2+)     Eo (volts) = 0.29Cytochrome c (Fe3+) + e- ? Cytochrome c (Fe2+)     Eo (volts) = 0.25

A. ubiquinone - cytochrome a - cytochrome a3 - cytochrome c B. cytochrome a3 - cytochrome a - cytochrome c - ubiquinone C. ubiquinone - cytochrome c- cytochrome a- cytochrome a3 D. cytochrome c - ubiquinone - cytochrome a - cytochrome a3

Biology & Microbiology

Gram-positive bacteria have a structurally and chemically more complex cell wall than gram-negative bacteria.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of

Na+ channel inactivation stop the inward flow of Na+?

a. A b. B

c. C d. D e. E

Biology & Microbiology

The ability of rats to cope with stress as adults can be affected by ____.

A. a nurturing mother B. the number of siblings they have C. the temperature they are raised in D. the altitude they are born at E. their sex

Biology & Microbiology