How many distinct aminoacyl-tRNA synthetases does each cell make?

A. ~180
B. ~60
C. ~20
D. ~1
E. ~120


Answer: C

Biology & Microbiology

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The pituitary gland secretes ______ during the alarm reaction.

a) corticosteroids b) neurotransmitters c) CRH d) ACTH

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Which of the following is true of water?

a. The oxygen end is slightly electropositive. b. Hydrogen bonds hold water molecules together. c. Water covers about one-half of the earth’s surface. d. It participates in hydrophobic interactions with polar molecules. e. Its solvent properties are greatest with nonpolar molecules.

Biology & Microbiology

The ________, or thrombocytes, play a vital role in clotting

Fill in the blank(s) with correct word

Biology & Microbiology

To determine the effects of caffeine on memory formation, Professor Mulligan gives one group of students a cup of caffeinated coffee and a separate group of students a cup of decaffeinated coffee. Thirty minutes later, he administers a memory formation task to both groups. The coffee in this experiment (both caffeinated and decaffeinated) represents the ________ .

a. control group b. independent variable c. experimental group d. dependent variable e. confounding variable

Biology & Microbiology