General Biology Test #3 Molecular Biology And Cell Reproduction
- 1.Waston and Crick built models that demonstrated that
- A.
DNA and RNA have the same structure.
- B.
DNA is made of two strands that twist into a double helix.
- C.
Guanine forms hydrogen bonds with adenine.
- D.
Thymine forms hydrogen bonds with cytosine.
- 2.Molecules of DNA are composed of long chains of
- A.
Amino acids.
- B.
Fatty acids.
- C.
Monosaccharides.
- D.
Nucleotides.
- 3.
![The entire molecule shown in the diagram is called a(n)
- ProProfs]( "The entire molecule shown in the diagram is called a(n)")
The entire molecule shown in the diagram is called a(n)- A.
Amino acids.
- B.
Nucleotide.
- C.
Polysaccharide.
- D.
Pyrimidine.
- 4.Cancer cells that spread are called
- A.
Benign
- B.
Malignant
- C.
Somatic
- D.
Gametic
- 5.
![Using radioactive tracers (shown below) to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that
- ProProfs]( "Using radioactive tracers (shown below) to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that")
Using radioactive tracers (shown below) to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that- A.
Genes are compose of protein molecules
- B.
DNA and proteins are actually the same molecules located in different parts of the cells.
- C.
Bacteria injects their DNA into the cytoplasm of bacteriophages.
- D.
DNA is the molecule that stores genetic information in the cells.
- 6.In humans, gametes contain
- A.
22 autosomes and 1 sex chromosome.
- B.
1 autosome and 22 sex chromosomess.
- C.
45 autosome and 1 sex chromosome.
- D.
1 autosome and 45 sex chromosomes.
- 7.The X and Y chromosomes are called the
- A.
Extra chromosomes.
- B.
Phenotypes.
- C.
Sex chromosomes.
- D.
All of the above.
- 8.Normal humans males develop from fertilized eggs containing which of the following sex chromosome combinations?
- A.
XY
- B.
XX
- C.
XO
- D.
OO
- 9.Chromatids are
- A.
Dense patches within the nucleus.
- B.
Bacterial chromosomes.
- C.
Joined strands of duplicated genetic material (chromosome)
- D.
Prokaryotic nuclei.
- 10.A strand of DNA has the following sequence of bases: ATC GTC TTC AAG What sequence of bases will make up the other strand of DNA?
- A.
TAG CAG AAG TTC
- B.
UUC AAG CAG UAG
- C.
UAG CAG AAG UUC
- D.
GTC ATC AAG TTC
- 11.
![Griffith's transformation experiments shown below
- ProProfs]( "Griffith's transformation experiments shown below")
Griffith's transformation experiments shown below- A.
Changed proteins into DNA.
- B.
Caused non-harmful bacteria to become deadly.
- C.
Resulted in DNA molecules becoming proteins.
- D.
Were design to show the effect of heat on bacteria.
- 12.The point at which two chromatids are attached to each other in a chromosome is called a(n)
- A.
Chloroplast.
- B.
Centromere.
- C.
Gamete.
- D.
Centriole.
- 13.The diploid number of chromosomes in a human skin cells is 46. The number of chromosomes found in a human ovum (egg) is
- A.
46
- B.
92
- C.
23
- D.
12.5
- 14.At the very beginning of the translation, the first tRNA molecule
- A.
Binds to the ribosome's A site.
- B.
Attaches directly to the DNA codon.
- C.
Connects an amino acid to its anticodon.
- D.
Attaches to the P site of the ribosome.
- 15.
![Using the DNA fingerprinting shown below, which suspect most likely matchs the sample taken from the crime scene
- ProProfs]( "Using the DNA fingerprinting shown below, which suspect most likely matchs the sample taken from the crime scene")
Using the DNA fingerprinting shown below, which suspect most likely matchs the sample taken from the crime scene- A.
Suspect A
- B.
Suspect B
- C.
No suspect matches the DNA fingerprint
- 16.The non-coding portions of DNA that are separated from the portions of DNA actually used during transcription are called
- A.
Mutons
- B.
Exons
- C.
Introns
- D.
Exposons
- 17.Many biologists believe that having the genes of eukaryotic cells interrupted by introns
- A.
Prevents the code from being corrected.
- B.
Ensured severely damaging mutations.
- C.
Ensures that replication occurs correctly.
- D.
Provides evolutionary flexibility.
- 18.The lac operon is shut off when
- A.
Lactose is present.
- B.
Lactose is absent.
- C.
Glucose is present.
- D.
Glucose is absent.
- 19.The portions of DNA molecules that actually code for the production of proteins are called
- A.
Mutons
- B.
Exons
- C.
Introns
- D.
Exposons
- 20.
![Refer to the illustration below. Where on the lac operon does transcription take place?
- ProProfs]( "Refer to the illustration below. Where on the lac operon does transcription take place?")
Refer to the illustration below. Where on the lac operon does transcription take place?- A.
Promoter (p)
- B.
Operator (o)
- C.
Gene (z)
- 21.The function of an operator is to?
- A.
Regulate access of RNA polymerase to specific genes.
- B.
Turn on and off the molecules of tRNA.
- C.
Control the process of transcription within the nucleus.
- D.
Generate amino acids for protein synthesis.
- 22.Cells must control gene expression so that
- A.
Their genes will only be expressed when needed.
- B.
Their genes will always be expressed.
- C.
Their genes will never be expressed.
- D.
Genetic disorders can be corrected.
- 23.A repressor protein
- A.
Prevents DNA synthesis.
- B.
Blocks movement of RNA polymerase.
- C.
Attaches to ribosome during translation.
- D.
Destroys amino acids before protein synthesis occurs.
- 24.
![Refer to the illustration below. To which portion of the lac operon does the repressor bind?
- ProProfs]( "Refer to the illustration below. To which portion of the lac operon does the repressor bind?")
Refer to the illustration below. To which portion of the lac operon does the repressor bind?- A.
Promoter (p)
- B.
Operator (o)
- C.
Gene (z)
- 25.The anticodons on the tRNA molecule for the codons in the mRNA: CUCAAGUCCUUC would be
- A.
GAG--UUC--AGG--AAG.
- B.
GAG--TTC--ACG--AAG.
- C.
CUC--GAA--CGU--CUU.
- D.
CUU--CGU--GAA--CUC.
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