The process by which undigested material is removed from the gastrointestinal tract is

A) secretion.
B) urination.
C) mechanical processing.
D) elimination.
E) absorption.


D

Biology & Microbiology

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The clonal selection theory implies that

A. related people have similar immune responses. B. antigens activate specific lymphocytes. C. only certain cells can produce interferon. D. memory cells are present at birth. E. the body selects which antigens it will respond to.

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The G1 checkpoint is used to determine which of the following?

a. if DNA replication has finished b. if the chromosomes have lined up at the metaphase plate c. if sister chromatids are attached to spindle microtubules properly d. if adequate reserves and cell size have been reached

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Archaeal membranes contain which of the following lipids?

A. Glycolipids B. Sulfolipids C. Phospholipids D. All of the choices are correct.

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For an individual with the XXY chromosomal composition, the expected number of Barr bodies in interphase cells is ________

A) variable B) zero C) one D) two E) three

Biology & Microbiology