The _______ cells in the islets of Langerhans of the pancreas are responsible for secreting insulin.

a. alpha cells
c. chief cells
b. beta cells
d. leukocytes


Ans: b. beta cells

Biology & Microbiology

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The concept of homeostasis originated with:

A. James Watson. B. Charles Darwin. C. Gregor Mendel. D. Claude Bernard. E. Rosalind Franklin.

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A(n) ________ operon is one whose transcription is repressed by effector molecules.

A. activated B. repressible C. inducible D. coinducible E. compressible

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Growth-factor stimulation of the Ras/Raf/ERK pathway initially stimulates the synthesis of cyclin

a. A. b. B. c. C. d. D.

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