Fats are major constituents of
a. proteins.
b. genes.
c. photosynthesis.
d. cell membranes.
e. all of these
D
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Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids?
a. ribosome b. lysosome c. smooth endoplasmic reticulum d. mitochondrion e. contractile vacuole
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.
The transfer of pollen from the male reproductive structure to the female reproductive structure is called
A. ovulation. B. implantation. C. pollination. D. photosynthesis.
In a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. Plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. When plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. Which of the following is true?
A. Red is dominant B. Blue is dominant C. Red is recessive D. Red is codominant E. Red is incompletely dominant