Which of the following is an important difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum?
a) the rough endoplasmic reticulum is the site of much protein folding and packaging, whereas the smooth endoplasmic reticulum is the site of lipid synthesis
b) the smooth endoplasmic reticulum is the site of protein synthesis, folding, and packaging, whereas the rough endoplasmic reticulum is the site of lipid synthesis
c) the rough endoplasmic reticulum is covered in ribosomes, whereas the smooth endoplasmic reticulum is not
d) the rough endoplasmic reticulum is studded with chloroplast, whereas the smooth endoplasmic reticulum is not
e) both the first and third answer choices are correct
Answer: e) both the first and third answer choices are correct
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The nucleotide sequence encoded in a gene defines the ____ that make up proteins
a. phosphate groups b. polypeptides c. ribosomes d. haplotypes
e. amino acidsDNA was not the first informational molecule in evolving cells. What choice best supports this statement?
a. Ribozymes were probably isolated in a vesicle resembling a living cell. b. Ribozymes act as catalysts for diverse reactions. c. Self-replicating molecules alone do not constitute life. d. DNA can replicate only with the help of enzymes, but the code for enzyme construction is found in the DNA. e. RNA appeared after hundreds of millions of years of prebiotic chemical synthesis
Sexual dimorphism has arisen as a result of ____.
A. stabilizing selection B. heterozygote superiority C. kin selection D. sexual selection E. directional selection
In "The Disembodied Lady," neurologist Oliver Sacks tells the story of a patient who suffered a catastrophic loss of sensory function. She said, "I feel my body is blind and deaf to itself... It has no sense of itself." The patient's nerve damage was strikingly specific. What single type of neuron most likely suffered damage?
A. rods and cones B. gustatory receptors C. olfactory receptors D. proprioceptors E. Meissner corpuscles