The main photosynthetic area of a leaf is composed
of
a. mesophyll.
b. cortex.
c. xylem.
d. epidermis.
e. none of these.
Answer: a
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Which of the following would not be a component of normal urine?
a. water b. urea c. bile pigments d. salts e. glucose
What is the name of the specific region where replication of a bacterial chromosome begins?
a. the replication fork b. the ori c. the ter d. the beg
Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste
What is the most logical explanation? A) Student A had an allergic reaction to the food, causing him to perceive the food as being bitter. B) Student A has normal "bitter" taste buds; student B has defective "bitter" taste buds that result in lower sensitivity to bitterness. C) Student A has a protein receptor capable of detecting a bitter molecule found in that substance, whereas student B lacks that particular protein receptor. D) Student A has normal saliva, whereas student B's saliva is more alkaline than normal.
Bits of DNA that literally jump from one chromosome to another are
A. pseudogenes. B. introns. C. tandem clusters. D. transposable elements.