A tiny loop of double-stranded DNA describes a

a. bacterium.
b. DNA ligase.
c. plasmid.
d. antibiotic.


d

Biology & Microbiology

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Which component of the blood is most important for clotting?

A. plasma B. platelets C. leukocytes D. erythrocytes E. All of the choices listed for this question are important for clotting.

Biology & Microbiology

Which of the following pairs of molecules share the same chemical composition but differ in molecular structure?

A. starch and glycogen B. glucose and fructose C. DNA and RNA D. lactose and sucrose

Biology & Microbiology

The (active/allosteric/substrate) sites of an enzyme can be used to regulate enzyme activity within a cell, and thereby control their metabolism.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Catastrophism was Cuvier's attempt to explain the existence of _____

A) evolution B) the fossil record C) uniformitarianism D) the origin of new species

Biology & Microbiology