The double helix of DNA is composed of building blocks called
amino acids.
monosaccharides.
phospholipids.
disaccharides.
nucleotides
nucleotides
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Which of the following are true of trash?
a. Cigarette filters can persist in the environment for 10 years. b. Components of a disposable diaper will persist for 100 years. c. A plastic bag can persist for 50 years. d. Many animals are killed by consuming trash each year. e. All of these are true.
Which of the following structures function(s) to bend light rays?
A. iris and vitreous humor B. ciliary body C. choroid D. rods and cones E. lens and cornea
Mutations vary in how much they affect the phenotype of an organism. Frameshift mutations typically cause more of an impact on phenotype than other mutations. Which describes a situation in which a deletion mutation would NOT result in a frameshift?
A) The deletion occurs at the beginning of a gene. B) The deleted base is adenine. C) The deletion consists of three consecutive bases. D) The deletion is a result of an error in replication.
When the neurotransmitter acetylcholine is applied to skeletal muscle cells, it binds the acetylcholine receptor and causes the muscle cells to contract
Succinylcholine, which is a chemical analog of acetylcholine, binds to the acetylcholine receptor on skeletal muscle cells but causes the muscle cells to relax; it is therefore often used by surgeons as a muscle relaxant. Propose a model for why succinylcholine causes muscle relaxation. What might be the mechanism to explain the different activities of acetylcholine and succinylcholine on the acetylcholine receptor?