Some drugs modulate the activity of ion channels. For example, Novocain somewhat inhibits the opening of sodium channels. What happens to the threshold of a sensory neuron if this drug is used?

What class of molecules do DNA belong to

Which type of mutation causes sickle cell anemia? a. silent b. missense c. insertion d. frameshift

How does meiosis lead to genetic variation?

Where is the complete genetic code of an organism?

Explain the process of crossing over and how it increases genetic diversity.

Which is a type of muscle that powers the cardiovascular system? A. Skeletal muscle B. Cardiac muscle C. Cartilage muscle D. Smooth muscle

To investigate how the sex of an offspring is determined

Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans.

The rapid depolarization phase of the action potentials of myocardial contractile cells is due primarily to which ion (s) ?

Echinoderm reproduction typically is a. sexual reproduction by budding. b. sexual reproduction with internal fertilization. c. by regeneraton. d. sexual reproduction with external fertilization.