A cell is minimally defined by ____
a. a nucleus that contains DNA
b. an organized chemical system and specialized molecules surrounded by a membrane
c. an organized chemical system for harnessing energy
d. a membrane comprised of phospholipids
e. specialized molecules that respond to their environment
b
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________ is considered the first messenger, while ________ is called the second messenger.
A. Peptide hormone; cAMP B. Insulin; glucagon C. ACTH; cortisol D. TSH; thyroxin E. Glucose; insulin
Which structure stores motile sperm?
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
What type of selection is represented by the accompanying figure?
a. no selection b. natural selection c. disruptive selection d. stabilizing selection e. directional selection
When an atom or molecule gains one or more electrons, it is said to be
A. energized. B. reduced. C. oxidized. D. polarized.