In eukaryotic cells, the structure primarily responsible for the adherence of cells to surfaces in the environment and the formation of biofilms is the

A. glycocalyx.
B. cilia.
C. cell membrane.
D. flagella.
E. cell wall.


Answer: A

Biology & Microbiology

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The only class of antibody that can cross the placenta is

A. IgA. B. IgD. C. IgG. D. IgE.

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As am embryo develops, different sets of genes are regulated by

a. promoters and operators b. mRNA and lac repressors c. operons and operators d. transcription factors and repressors

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The immunoglobulin class that has an Fc region that binds to receptors on basophils and mast cells is

A. IgD. B. IgM. C. IgA. D. IgG E. IgE.

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The carrying capacity of Earth for humans is approximately 8 billion people.

Answer the following statement true (T) or false (F)

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