Which enzyme recognizes a specific nucleotide sequence (~4 to 8 nucleotides in length) and catalyzes the digestion of the nucleic acid at that site, causing a break in the DNA strand?

a. Ligase
b. Gyrase
c. Helicase
d. Endonuclease


D
Endonucleases recognize a specific nucleotide sequence (usually 4 to 8 nucleotides in length) known as the enzyme's recognition or restriction site.

Biology & Microbiology

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In plants, extreme wilting of leaves and stems can cause the cells to retract from the cell wall, a condition known as

____.

a. hemolysis b. an increase in turgor pressure c. plasmolysis d. a lack of solutes in the cell e. a higher than normal concentration of water in the cell

Biology & Microbiology

Symptoms of influenza include

A. fever and pneumonia. B. fever, sore throat, rash, and cough. C. fever, diarrhea, and vomiting. D. fever, myalgia, sore throat, cough, and nasal discharge. E. nasal discharge, mild fever, and absence of cough.

Biology & Microbiology

What type of bond forms when two elements equally share their electrons?

a. Polar b. Hydrogen c. Nonpolar d. Ionic e. None of these choices.

Biology & Microbiology

Cells viewed in darkfield microscopy appear similar to those stained with the negative stain

Indicate whether the statement is true or false

Biology & Microbiology