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Twelfth Grade (Grade 12) DNA, RNA, and Genetics Questions

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Grade 12 DNA, RNA, and Genetics
Grade 12 DNA, RNA, and Genetics
Which base is present in DNA but not RNA?
  1. cytosine
  2. uracil
  3. guanine
  4. thymine
  5. adenine
Grade 12 DNA, RNA, and Genetics
The structure of DNA is a(n)
  1. semicircle.
  2. lipid membrane.
  3. double helix.
  4. equilibrium.
Grade 12 DNA, RNA, and Genetics
The two identical halves of a chromosome after replication are
  1. kinetochores.
  2. spindle fibers.
  3. sister chromatids.
  4. centromeres.
Grade 12 DNA, RNA, and Genetics
The major function of DNA ligase is to
  1. cut DNA strand open at a specific site.
  2. help protein to bind DNA tightly.
  3. transcribe DNA into RNA.
  4. link two DNA strands from 3' to 5'.
Grade 12 DNA, RNA, and Genetics
If the universal adapter sequence is GTCATTGCTTGCAATGTT, which universal primer should be used for DNA sequencing?
  1. GTCATTGCTTGCAATGTT
  2. TTGTAACGTTCGTTACTG
  3. CAGTAACGAACGTTACAA
  4. AACATGCTGGTTAAGTCC
Grade 12 DNA, RNA, and Genetics
Which enzyme could be used to join two DNA fragments?
  1. DNA ligase
  2. DNA polymerase
  3. DNA recombinase
  4. DNA endonuclease
Grade 12 DNA, RNA, and Genetics
Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents will most likely produce a child with type O blood?
  1. one parent with type AB blood, and the other parent with type A blood
  2. one parent with type AB blood and the other parent with type O blood
  3. one parent with heterozygous type A blood, and the other parent with type O blood
  4. one parent with homozygous type A blood, and the other parent with homozygous type B blood
Grade 12 DNA, RNA, and Genetics
The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA
  1. contains one less oxygen atom.
  2. is a six-carbon sugar.
  3. is helical.
  4. is a six-ring carbon.
Grade 12 DNA, RNA, and Genetics
DNA ligase plays an essential role in biotechnology because it
  1. helps foreign DNA to integrate into native DNA.
  2. clears off alien DNA to keep the sample pure.
  3. prevents the DNA from being digested.
  4. is extremely thermostable and effective.
Grade 12 DNA, RNA, and Genetics
A man with type A blood has a child with a woman who has type B blood. The child has type O blood. What can be determined about the blood types of any future children this couple may have?
  1. All future children will also have type O blood.
  2. There is a 10% chance that most future children will be type AB.
  3. The future children have an equal chance of having all of the four possible blood types.
  4. The only other blood type that is possible for the future children to have is type B.
Grade 12 DNA, RNA, and Genetics
One characteristic Mendel examined was pea pod shape. If a pea plant that is heterozygous for inflated pots (Ii) is crossed with one that is homozygous for constricted pods (ii), what are the possible genotypic and phenotypic ratios of the offspring?
Table 2x2
  1. The genotypic ratio would be 1 Ii : 1 ii. The phenotypic ratio would be 1 inflated: 1 constricted.
  2. The genotypic ratio would be 1 II : 1 Ii : 2 ii. The phenotypic ratio would be 2 inflated: 2 constricted.
  3. The genotypic ratio would be 3 Ii : 1 Ii. The phenotypic ratio would be 4 constricted: 0 inflated.
  4. The genotypic ratio would be 1 II : 2 Ii : 1 ii. The phenotypic ratio would be 2 inflated: 2 constricted.
Grade 12 DNA, RNA, and Genetics
Endonucleases act on
  1. DNA.
  2. RNA.
  3. protein.
  4. carbohydrates.
Grade 12 DNA, RNA, and Genetics
For the two given DNA fragments, GTTCGACTAGGA and TGGGCATCG, ligation results in the product
  1. GTTCGACTAGGATGGGCATCG.
  2. TGGGCATCGGTTCGACTAGGA.
  3. both a and b
  4. neither a nor b
Grade 12 DNA, RNA, and Genetics
Grade 12 DNA, RNA, and Genetics
To make restriction fragments, a DNA sample is treated with
  1. restriction enzymes.
  2. gel electrophoresis.
  3. DNA polymerase.
  4. DNA ligase.
  5. PCR.
Grade 12 DNA, RNA, and Genetics
What characteristic makes plasmids useful as a vector?
  1. Many plasmids contain genes that convey antibiotic resistance.
  2. Plasmids do not need to be coaxed to infect cells by artificial means.
  3. Plasmids use the same origin of replication as eukaryotic cells.
  4. Plasmids can accommodate a large amount of DNA.
Grade 12 DNA, RNA, and Genetics
Grade 12 DNA, RNA, and Genetics
Hemophilia is a sex-linked, recessive trait. Which statement describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman whose father is a hemophiliac?
  1. Each of their sons will have hemophilia.
  2. None of their daughters will have hemophilia.
  3. Their sons have a 25% chance of having hemophilia.
  4. There is a 50% chance that their daughters will have hemophilia.
Grade 12 DNA, RNA, and Genetics
Which property distinguishes an expression vector from a typical vector?
  1. possession of a recognition sequence for a restriction enzyme
  2. presence of reverse transcriptase
  3. a promoter sequence
  4. ability to replicate independently within the host
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