Plasma membranes are a feature of

A. all cells.
B. prokaryotic cells only.
C. eukaryotic cells only.
D. plant cells only.
E. animal cells only.


A. all cells.

Biology & Microbiology

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Which of the following is incorrect with respect to translation and the genetic code?

A. In bacteria, there is a direct correlation between the order of amino acids and the order of nucleotides in the gene encoding for a protein. B. The insertion of one or two nucleotides into the coding sequence will cause a shift in the reading frame. C. A codon is three nucleotides in length. D. AUG is the start codon and encodes for a methionine (or derivative of methionine) at the carboxyl end of the protein.

Biology & Microbiology

The genes for hemoglobin ____

a. are found only in red blood cells b. are never regulated c. contain only introns d. are turned off in a small percentage of body cells e. are found in all body cells

Biology & Microbiology

Which of the following represents energy flow in a grazing food web?

A. Producers ? detritivores ? decomposers B. Producers ? decomposers ? detritivores C. Producers ? herbivores ? decomposers ? carnivores D. Producers ? herbivores ? carnivores ? decomposers E. Producers ? herbivores ? detritivores ? carnivores

Biology & Microbiology

In an immunodiffusion test to diagnose histoplasmosis, a patient's serum is placed in a well in an agar plate. In a positive test, a line forms as the serum diffuses from the well and meets material diffusing from a second well. What type of test is this?

A) an agglutination reaction B) a precipitation reaction C) a complement-fixation test D) an indirect ELISA test E) a direct ELISA test

Biology & Microbiology