A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation?

A) phosphate
B) nitrogen
C) guanine
D) uracil
E) thymine


D

Biology & Microbiology

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Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

A. A polar amino acid to a non-polar amino acid within a transmembrane domain B. A non-polar amino acid to a polar amino acid within a transmembrane domain C. A polar amino acid to a non-polar amino acid within a cytoplasmic domain D. A non-polar amino acid to a polar amino acid within a cytoplasmic domain

Biology & Microbiology

The ancestral lung of fish has developed into a unique structure used for another important function. What is this function?

a. respiration b. buoyancy c. lymph circulation d. excretion of uric acid e. excretion of urea

Biology & Microbiology

What is the role of mast cells in the inflammatory response?

What will be an ideal response?

Biology & Microbiology

The vertebrate forelimb initially develops in the embryo as a solid mass of tissue. As development progresses, the solid mass near the end of the forelimb is remodeled into individual digits. Which of the following best explains the role of apoptosis in remodeling of the forelimb?

A) Apoptosis replaces old cells with new ones that are less likely to contain mutations. B) Apoptosis involves the regulated activation of proteins in specific cells of the developing forelimb that leads to the death of those cells. C) Apoptosis involves the destruction of extra cells in the developing forelimb, which provides nutrients for phagocytic cells. D) Apoptosis in the developing forelimb triggers the differentiation of cells whose fate was not already determined.

Biology & Microbiology