Cytokinesis in animal cells involves contraction of a ring of ____ microfilaments
a. tubulin plus actin
b. actin plus myosin
c. cyclin plus myosin
d. cohesin plus actin
e. cyclin plus actin
b
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The enzyme rubisco fixes carbon by attaching CO2 to:
a. phosphoglycerate (PGA) b. ribulose bisphosphate (RuBP) c. phosphoglyceraldehyde (PGAL) d. glucose e. oxaloacetate
Select the correct statement regarding the temperature response of the immune system.
A. When macrophages encounter invading cells, they release immunoglobulin-1, which is carried to the brain by the circulatory system. B. Interleukin-1 is a pyrogen, which can cause the neurons in the hypothalamus to raise the body's temperature, producing a fever. C. Fever contributes to the body's defenses by stimulating hyperhidrosis and causing the liver and spleen to store magnesium. D. Fevers above 99° F are often fatal.
Which of the following animals has a three-chambered heart?
A) snake B) crocodile C) human D) bird
Which of the following best describes High-Density Lipoproteins (HDLs)?
A) HDLs are transport proteins that carry lipids from tissues to the liver. B) HDLs are critical components to the oxygen-carrying ability of red blood cells. C) HDLs are transport proteins that carry lipids from the liver to tissues. D) HDLs are large versions of the cholesterol molecule.