In humans, the majority of a transcription unit is composed of ____
a. exons
b. introns
c. promoter regions
d. start codons
e. regulatory elements
ANSWER: b
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What is the purpose of the intestinal villi and microvilli?
a. increase surface for maximum absorption b. increase surface area for maximum infiltration of capillary beds c. decrease area for bacterial growth d. increase area for bacterial growth e. increase the area for the serosa
Net primary productivity cannot be measured in aquatic ecosystems
Indicate whether the statement is true or false
The accompanying figure represents a chromosome at metaphase of mitosis. How many DNA molecules are present in this chromosome?
A) one B) two C) four D) more than four E) impossible to determine
When a cell is active, the levels of carbon dioxide are ________ inside the cell than outside the cell, causing the gas to diffuse out of the cell
Fill in the blank(s) with correct word