Which of the following hormones exerts its action by interacting with a receptor at the cell surface?
A. Testosterone
B. Cortisol
C. Estrogen
D. Progesterone
E. Insulin
Answer: E
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Cnidarians alone have _____
a. nematocysts c. a hydrostatic skeleton b. a mantle d. a radula
A sea squirt is an example of a
A. tunicate. B. fish. C. lancelet. D. amphibian. E. mammal.
An example of a density-independent factor that affects a population's growth is
A. All of the answer choices are correct. B. frost killing all of your tomato plants. C. a fungus infecting your tomato plants. D. your tomato plants competing for water. E. insects eating your tomato plants.
Griffith first proposed the "transformation principal" through his studies on Streptococcus pneumoniae bacterium. Which of the following molecules was later found to be responsible for this phenomenon?
A. protein B. RNA C. bacteriophage D. phage E. DNA