Isotopes of atoms ____
a. have the same number of neutrons but a different number of protons
b. behave the same chemically and physically but differ biologically from other isotopes
c. are the same physically and biologically but differ from other isotopes chemically
d. have the same number of protons but a different number of neutrons
e. are produced when atoms lose electrons
ANSWER: d
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The smooth endoplasmic reticulum functions in synthesis of
A) lipids. B) polysaccharides. C) proteins. D) DNA. E) all of the above
The first and second laws of thermodynamics apply to nonliving systems like gasoline engines but do not apply to reactions in living cells.
a. true b. false
The lagging strand is characterized by a series of short segments of DNA (Okazaki fragments) that will be joined together to form a finished lagging strand
The experiments that led to the discovery of Okazaki fragments gave evidence for which of the following ideas? A) DNA polymerase is a directional enzyme that synthesizes leading and lagging strands during replication. B) DNA is a polymer consisting of four monomers: adenine, thymine, guanine, and cytosine. C) DNA is the genetic material. D) Bacterial replication is fundamentally different from eukaryotic replication. The key shouldn't be way longer than the distractors.
Which of the following pairs is mismatched?
A) leprosy — direct contact B) poliomyelitis — respiratory route C) meningococcal meningitis — respiratory route D) rabies — direct contact E) listeriosis — ingestion