A colleague gives you two membrane fractions from a plant cell lysate. One contains the plasma membrane fraction, the other the mitochondrial fraction. The tubes are not labeled, but you run the samples anyway, looking at the macromolecule composition of the samples. You know for certain that the second sample contains the mitochondrial fraction simply because it contains insignificant amounts of

A) lipids.
B) protein.
C) specifically phospholipids.
D) carbohydrates.
E) both choices C and D


D) carbohydrates.

Biology & Microbiology

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In life cycles that alternate between haploid and diploid stages, fertilization doubles the number of chromosomes per cell while ______ reduces it in half.  

A.  mitosis B.  meiosis C.  binary fission D.  syngamy

Biology & Microbiology

Each amino acid made during protein biosynthesis first requires a separate biosynthetic pathway to be invoked by a cell

Indicate whether the statement is true or false.

Biology & Microbiology

Parietal cells of the gastric glands in the stomach produce

A. chyme. B. gastrin. C. pepsinogen. D. HCl (hydrochloric acid).

Biology & Microbiology

Which of the following is not an effect of acid deposition?

A. destruction of aquatic food webs B. decrease in the number of species that can survive in the lake ecosystem C. thinning of high-elevation forests D. increase of pH in lakes E. deformities in fish and other aquatic organisms

Biology & Microbiology