Which of the following statements regarding membrane protein function is false?
A) Membrane proteins serve as enzymes.
B) Membrane proteins act as receptors to molecules like hormones.
C) Membrane proteins form junctions between cells.
D) Membrane proteins produce phospholipids.
Answer: D
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Which of the following components makes up the greatest percentage of blood volume?
a. Water b. Plasma proteins c. Platelets d. White blood cells e. Red blood cells
What is the ultimate source of genetic variation within a population?
a. Mutations in DNA b. Adaptation of a species to environmental changes c. A sensory system that can detect an environmental change d. Homeostatic mechanisms that compensate for environmental changes e. A system of locomotion that allows an organism to escape environmental changes
At what location do the molecules and ions that are reabsorbed from the nephron re-enter the blood?
a. at the renal artery b. at the afferent arteriole c. at the efferent arteriole d. at the peritubular capillaries
The male urethra is typically sterile
Indicate whether the statement is true or false