Every choice below EXCEPT __________ is a plant
hormone.
a. IAA
b. abscisic acid
c. phytochrome
d. cytokinin
e. all are hormones
Answer: c
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Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. B. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. D. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient.
Around 150 living genera of animals provide direct support of the endosymbiont theory by ____
a. hosting Archaea in their cells b. having bacterial ribosomes in their cells c. using the cell membrane to protect against bacterial invaders d. ejecting cyanobacterial invaders e. hosting eukaryotic algae or cyanobacteria in their cells
Which part of the brain adjusts the rate and force of the heartbeat based on the information received from arterial stretch receptors (baroreceptors)?
1.Cerebellum 2.Cortex 3.Medulla 4.Midbrain
Which of the following is (are) true about predator–
prey coevolution? a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. All of the above are true. e. None of the above are true.