Land plants take up phosphates from ____
a. rainfall
b. seawater
c. soil water
d. the atmosphere
e. animal waste
ANSWER: c
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The hormone produced by cells around the embryo that maintains the corpus luteum and pregnancy is called
A. estrogen. B. progesterone. C. human chorionic gonadotropin (HCG). D. follicle-stimulating hormone (FSH). E. luteinizing hormone (LH).
Which statement about the sense of smell in humans is most accurate?
A) Combinations of over 300 receptors allow us to discern thousands of scents. B) Smell is about equally as strong as taste. C) Ciliated cells rapidly move scent molecules to the brain for rapid analysis. D) One hundred different receptor varieties allow us to discern about 100 scents.
When macrophages migrate to the skin and remain there, they are called ________ cells.
A. GALT B. Kupffer C. alveolar D. Langerhans E. dendritic
The receptor for a peptide hormone _______.
a. sits in the cell's outer membrane and binds to a hydrophobic hormone b. sits in the cell's outer membrane and binds to a hydrophilic hormone c. sits inside the cell and binds to a hydrophobic hormone d. sits inside the cell and binds to a hydrophilic hormone