Which type of junctions must there be between cells to form a barrier?

A. adhesion junctions
B. free junctions
C. gap junctions
D. tight junctions
E. channel junctions


Answer: D

Biology & Microbiology

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If you were looking at a cell under a powerful microscope, what would tell you that it is a eukaryotic cell?

A. It is moving. B. It has a nucleus. C. It has DNA. D. It has ribosomes.

Biology & Microbiology

The function of a protein is dependent upon the shape into which the chain of amino acids folds. Many non-covalent interactions are responsible for maintaining the protein's shape. Assume you have isolated a protein from an organism in its proper shape

and you have treated it with an enzyme that selectively targets and breaks only the peptide bonds in the proteins. Would the protein retain its shape under these conditions? A. Yes; once the shape of a protein is formed, the peptide bonds are unnecessary. B. Yes; the non-covalent interactions are stronger than the peptide bonds. C. No; while the non-covalent bonds determine the shape of a protein, the peptide bonds are required to hold the amino acids together. D. Yes; but the shape would be affected to a greater extent by changes in temperature.

Biology & Microbiology

The ________ virus in chickens was the first association between viral infection and cancer.

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

Biology & Microbiology

The majority of precipitation reaching land is derived from evaporation of oceanic waters

Indicate whether the statement is true or false

Biology & Microbiology