Multiple effects of a single gene is known as
a. expressivity.
b. penetrance.
c. codominance.
d. pleiotropy.
e. multiple alleles.
D
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What are the chemical classes which include hormones? Check all that apply.
_____ carbohydrates _____ amines _____ peptides _____ proteins _____ steroids
Which statement is true?
a. Feathers are waterproof because they secrete cellulose. b. Trabeculae are small bones found in the wings. c. Both beaks and feathers are composed of keratin. d. Feathers help to radiate excess body heat.
This hormone binds to a plasma membrane
receptor and has its effect by way of a second messenger. This hormone is
a. aldosterone. b. calcitonin. c. progesterone. d. cortisol. e. more than one of these
The ability of a lens to gather light is referred to as its
A. resolution. B. numerical aperture. C. refraction. D. contrast. E. magnification.