for karen 100

for karen 100

Question 1Base pairingA. requires hydrogen bonds.B. occurs between identical bases.C. takes place between sugars and phosphates on the two strands
in a helix.D. explains the X-ray results from Rosalind Franklin.E. occurs between A and C..5 pointsQuestion 2DNA replicationA. does not require proteins.B. takes place in the nucleus of the cell.C. occurs in G1 of interphase.D. occurs in the cytoplasm of the cell.E. is constantly happening in a cell..5 pointsQuestion 3The fact that the two strands composing a DNA molecule are
called antiparallel has to do with the orientation of theA. sugar molecules.B. bases.C. hydrogen bonds.D. sulfide bonds.E. phosphate molecules..5 pointsQuestion 4The most important experimental results that suggested to Watson
and Crick that DNA was in the form of a helix wasA. the findings of Chargaff that DNA always had equal amounts of
A and T and equal amounts of G and C.B. understanding DNA replication.C. X-ray data from Rosalind Franklin.D. the discovery that DNA is wound around histone proteins.E. Griffith’s results with transformation..5 pointsQuestion 5What step in DNA replication precedes the pairing of
complementary bases?A. mitotic division.B. polymerization of DNA.C. separation of the two strands.D. joining of the two strands.E. formation of the histone core..5 pointsQuestion 6A component of bacteria that are often used in biotechnology
areA. exons.B. operons.C. introns.D. plasmids.E. polypeptides..5 pointsQuestion 7Normal human body cells contain how many chromosomes?A. 42B. 46C. 23D. 22E. 44.5 pointsQuestion 8In recombinant DNA technology, enzymes used to precisely cut DNA
are calledA. RNA polymerases.B. DNA polymerases.C. vectors.D. DNA ligases.E. restriction enzymes..5 pointsQuestion 9What form of RNA carries instructions from the nucleus to the
ribosome?A. sRNAB. rRNAC. tRNAD. mRNAE. bRNA.5 pointsQuestion 10The two subunits of the ribosome join duringA. termination of transcription.B. termination of translation.C. initiation of translation.D. elongation.E. promotion of transcription..5 pointsQuestion 11In eukaryotes, transcription occurs in theA. cytoplasm.B. nucleus.C. ribosome.D. mitochondria.E. cell membrane..5 pointsQuestion 12In DNA, cytosine bonds to guanine. In RNA, cytosine bonds toA. uracil.B. guanine.C. thymine.D. cytosine.E. adenine..5 pointsQuestion 13The bases are bonded to what part of the backbone of the DNA
molecule?A. the 4’ carbon atom of the sugar molecule.B. the 5’ carbon atom of the sugar molecule.C. the 2’ carbon atom of the sugar molecule.D. the 1’ carbon atom of the sugar molecule.E. the 3’ carbon atom of the sugar molecule..5 pointsQuestion 14The anticodon of the tRNA molecule base pairs withA. polypeptides.B. amino acids.C. mRNA.D. rRNA.E. DNA..5 pointsQuestion 15DNA replication of a single DNA molecule is referred to as
semiconservative becauseA. one DNA strand is replicated continuously, while the other
must be replicated discontinuously.B. of the two DNA molecules, one is made up totally of parental
DNA, while the other is entirely newly synthesized DNA.C. each of the two DNA molecules will consist of one parental
strand and one newly synthesized strand.D. it results in two nonidentical DNA molecules.E. all the DNA strands in the two DNA molecules will have both
parental and newly synthesized DNA..5 pointsQuestion 16A package of histones with DNA wrapped around them forms
spherical structures calledA. lysosomes.B. nucleoli.C. nucleosomes.D. chromatin.E. ribosomes..5 pointsQuestion 17What enzyme is used to “glue” together the ends of cut pieces of
DNA?A. proteaseB. restriction enzymesC. DNA ligaseD. DNA polymeraseE. RNA polymerase.5 pointsQuestion 18Hershey and Chase performed an experiment in which they used
radioactive isotopes to phosphorus and sulfur to label different
components of bacterial viruses. Their results clearly showed
thatA. genetic material normally contains radioactive isotopes.B. DNA was entering into the infected bacteria.C. the viruses did not contain DNA.D. protein was entering into the infected bacteria.E. the viruses did not contain protein..5 pointsQuestion 19We refer to the DNA code as being redundant or repetitive. This
means thatA. one codon codes for one amino acid.B. a single triplet may code for more than one amino acid.C. each triplet codes for one amino acid.D. each triplet codes for a different amino acid.E. some codons code for the same amino acid..5 pointsQuestion 20When looking at a table depicting the genetic code, the base
sequences signifyA. tRNA.B. rRNA.C. mtDNA.D. mRNA.E. DNA.

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