Enzymes called ____ form breaks in the DNA molecules to prevent the formation of knots in the DNA helix during

replication.
a. topoisomerases
b. single-strand binding proteins
c. DNA polymerases
d. RNA polymerases
e. DNA ligases


a

Biology & Microbiology

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In a neuron at rest, which of the following is TRUE?

A. Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron. B. Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron. C. Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron. D. Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. E. Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.

Biology & Microbiology

Fridtjof Nansen contributed greatly to our knowledge of the Arctic regions

Indicate whether the statement is true or false

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How can bacteriophage DNA be spread from cell to cell without causing cell death?

A) by altering the way a cell splices its RNA B) via a lytic cycle C) via a lysogenic cycle D) by changing the length of its DNA molecules

Biology & Microbiology

All of the following are correct about Staphylococcus aureus except

A. it is the coagulase-positive species. B. the body's most powerful defense against it lies in the T-cell response. C. carriers may be treated with antibiotics to clear them of the bacteria. D. most strains are resistant to penicillin and ampicillin. E. it causes furuncles, carbuncles and abscesses.

Biology & Microbiology