Being lipid soluble, steroids can do all the following EXCEPT ________
A) diffuse through the plasma membranes of target cells
B) catalyze a reaction that produces cyclic AMP (cAMP)
C) enter the nucleus
D) bind to receptor proteins within the nucleus
E) activate genes to transcribe mRNA for protein synthesis
B
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Answer the following statements true (T) or false (F)
1. In order for the necessary bridges to form, potassium must be released from the endoplasmic reticulum. 2. In the sliding filament model of muscle contraction, bridges are formed between the myosin and actin. 3. Energy for muscle contraction is provided when ATP is broken down. 4. In order for movement to take place, when the prime mover contracts, the synergist must relax. 5. In order for movement to take place, the antagonists must do the opposite of the prime mover.
Answer the following questions true (T) or false (F)
1. The respiratory membrane is a combination of the respiratory bronchioles, alveolar ducts, and alveolar sacs. 2. Alveolar surface tension determines lung compliance. 3. Surfactant helps prevent atelectasis by humidifying air before it enters the alveoli.
An investigator who conducts an experiment to determine how changes in pH affect the function of enzymes on digestion is most likely to be a(n)
A. neurologist. B. anatomist. C. engineer. D. physiologist. E. histologist.
When a large portion of a population is wiped out and the genetic base is rebuilt from a small group of individuals, then the __________, a type of genetic drift, may result
Fill in the blank with correct word