Which of the following is NOT true
concerning nectar? It is
a. sucrose-rich.
b. a dilute fluid.
c. the only food for most butterflies.
d. rich in vitamins and minerals.
e. easy for pollinators to sip
D
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How are receptor tyrosine kinases and steroid hormone receptors similar?
A. Both are activated by autophosphorylation B. Both are transmembrane proteins with a single transmembrane domain C. Both have a DNA-binding domain D. Both have a site for binding ligand
A cell that has three copies of every chromosome is
A) euploid. B) triploid. C) aneuploid. D) tetraploid.
Insulin stimulates
a. muscle and fat cells to take up glucose. b. increased levels of glucose in the blood. c. a decrease in muscle cell activity. d. an increase in exercise. e. liver cells to release glycogen
Phagocytosis is a process by which cells do which of the following?
A.) ingest extracellular fluid and macromolecules B.) consume large particles, such as microbes and cell debris C.) engage in receptor mediated endocytosis D.) secrete hormones and neurotransmitters E.) digest their own worn out organelles