You have a friend who lost 7 kg (about 15 pounds) of fat on a "low carb" diet. How did the fat leave her body?
A) It was released as CO2 and H2O.
B) Chemical energy was converted to heat and then released.
C) It was converted to ATP, which weighs much less than fat.
D) It was broken down to amino acids and eliminated from the body.
E) It was converted to urine and eliminated from the body.
Answer: A) It was released as CO2 and H2O.
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The special functions performed by membranes are the result of
a. the number of layers of phospholipids present. b. concentration gradients of the interior contents. c. lipids embedded in the protein layer. d. steroids. e. proteins in the lipid bilayer.
Suppose a biologist can separate one of a dozen pieces of chromatin from a eukaryotic (animal) nucleus. It might consist of which of the following?
A) one-twelfth of the genes of the organism B) two chromosomes, each with six chromatids C) a single circular piece of DNA D) two long strands of DNA plus proteins E) two chromatids attached together at a centromere
The number of chromosomes characteristic of diploid eukaryotic cells, in general
A. is 46. B. can be predicted by the size of the organism. C. varies considerably from 2 to over 1000 in different species. D. changes as each organism grows and ages.
Respiration ________, and cellular respiration ________
A) produces ATP; is gas exchange B) is gas exchange; produces ATP C) produces glucose; produces oxygen D) uses glucose; produces glucose