A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?

A. 0
B. 5
C. 7
D. 9
E. 14


B. 5

Biology & Microbiology

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Another name for crossing over is:

A. realignment. B. reassortment. C. recombination. D. reallocation.

Biology & Microbiology

Calcium is necessary to initiate muscle contraction. Which of the following molecules binds calcium?

A. myosin B. actin C. troponin D. tropomyosin

Biology & Microbiology

A human X-linked gene is ____

a. found only in males b. more frequently expressed in females c. found on the Y chromosome d. transmitted from father to son e. found on the X chromosome

Biology & Microbiology

Plant cell walls are cellulose fibrils in a matrix of

a. chitin and pectin. b. pectin and hemicellulose. c. Pectin and lignin. d. lignin and chitin.

Biology & Microbiology