The liver converts the waste product ammonia to a much less toxic molecule of ____
a. alcohol
b. bilirubin
c. cholesterol
d. bicarbonate
e. urea
ANSWER: e
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Which individual may be a carrier for a recessive X-linked trait in humans?
a. a homozygous recessive male b. a homozygous recessive female c. a homozygous dominant female d. a heterozygous female e. a heterozygous male
An experiment mixed together oil (lipids), organophosphate-containing detergent in water, and copper ions to act as a catalyst for a chemical reaction. Membranes budded off of the oil in this mixture. Which of the following is a reasonable and possible explanation of the experimental results?
a. The chemical reaction caused the organophosphates from the detergent to chemically combine with lipids from the oil to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome. b. The chemical reaction caused the organophosphates from the detergent to chemically combine with lipids from the oil to form phospholipids with hydrophilic heads and hydrophobic tails. The hydrophobic tails lined up towards each other with their hydrophilic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a spherical liposome. c. The copper ions permanently, chemically combined with the lipids to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome. d. The copper ions permanently, chemically combined with the lipids and phosphates to form phospholipids. The hydrophilic tails lined up towards each other with their hydrophobic heads pointing out towards the water; this configuration formed a phospholipid bilayer that pulled into a liposome.
Some mammals, like the kangaroo rat of the desert, have extremely long loops of Henle in their kidneys. What purpose must this serve?
What will be an ideal response?
Which of the following are polysaccharides?
A) fructose and deoxyribose B) starch and glycogen C) DNA and RNA D) sucrose and glucose