Which statement best describes active transport?
A) A substance goes from an area of low concentration to an area of high concentration, and this releases energy.
B) A substance goes from an area of high concentration to an area of low concentration, and this requires energy.
C) A substance goes from an area of low concentration to an area of high concentration, and this requires energy.
D) A substance goes from an area of high concentration to an area of low concentration, and this releases energy.
C
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Species - as opposed to individuals or populations - are considered the ultimate evolutionary unit because (select all correct choices)
A. new mutations can potentially spread within a species, but not beyond it. B. species can become extinct. C. species give rise to other species. D. changes in gene frequencies over time can only be observed within species, not within populations. E. none of these
Organs strung together functionally and usually structurally form
a. organs. b. systems. c. tissues. d. organelles.
Glycogen is hydrolyzed by:
a. maltase. b. dipeptidases. c. bile salts. d. chymotrypsin. e. amylase
The collecting duct of the nephron originates in what region of the kidney and extends to what region of the kidney?
A. renal medulla to the renal pelvis B. renal medulla to the renal cortex C. renal pelvis to the renal medulla D. renal cortex to the renal medulla E. renal cortex to the renal pelvis