A Barr body is normally found in the nucleus of which kind of human cell?
A) unfertilized egg cells only
B) sperm cells only
C) somatic cells of a female only
D) somatic cells of a male only
E) both male and female somatic cells
Ans: C) somatic cells of a female only
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Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates. Which of the following genes would you predict to be constitutively (constantly) expressed?
A) genes involved in the biosynthesis of the amino acid tryptophan B) genes involved in the degradation of tryptophan C) genes involved in the degradation of arabinose, a sugar D) genes that code for regulatory proteins
A signaling molecule that binds a membrane protein is called a ____
Fill in the blank with the appropriate word.
The outer transparent protective cover over the front of the eyeball is the
a. fovea. b. retina. c. sclera. d. choroid. e. cornea.
________ is a metabolic process that creates ATP for the cell by the breakdown of glucose molecules. This process occurs in the cytoplasm
Fill in the blank(s) with correct word