In the process of peristalsis:a
waves of muscular contractions force food down the digestive tract.
b. chemical digestion of food takes place in the digestive tract.
c. food is discharged from the bodies of unicellular animals.
d. digestion occurs intracellularly within food vacuoles.
e. digestion of food takes place outside the body of an animal.
a
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The organelle involved in the oxygen-requiring process by which the energy harvested from macromolecules is used to generate ATP is the:
A. chloroplasts. B. ER. C. nucleus. D. lysosome. E. mitochondria.
True or false: harmful mutations are always eliminated from the genome in one or a few generations because they decrease the survival and reproduction rates of the individuals that carry them
A. true B. false
Kinases are enzymes that
A) add phosphate groups. B) do not alter target activity. C) are always inhibitory. D) remove phosphate groups. E) all of the above
Calcium levels in the body are maintained by hormones. If the blood calcium level rises above a set point, calcitonin is secreted by the thyroid gland and sets into motion responses to lower the blood calcium back to the set point
If the blood calcium level falls below a set point, the parathyroid gland secretes parathyroid hormone that sets into motion responses to raise the blood calcium. These homeostatic responses are examples of A) positive feedback. B) effectors. C) sensors. D) negative feedback.