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Ninth Grade (Grade 9) DNA, RNA, and Genetics Questions

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Grade 9 DNA, RNA, and Genetics
The two sides of the DNA ladder are loosely bonded together by
  1. polymer chains.
  2. molecular glue.
  3. hydrogen bonds.
  4. magnetism.
Grade 9 DNA, RNA, and Genetics
The dominant trait is represented by a                  ?
  1. capital letter
  2. lowercase letter
  3. italicized letter
  4. none of these
Grade 9 DNA, RNA, and Genetics
Deoxyribose is the
  1. DNA that is replicated.
  2. sugar in RNA nucleotides.
  3. sugar in DNA nucleotides.
  4. T-A, G-C, and U-A pairs in RNA.
Grade 9 DNA, RNA, and Genetics
Which nucleotide(s) bond(s) with adenine?
  1. thymine only
  2. uracil only
  3. guanine and cytosine
  4. thymine and uracil
Grade 9 DNA, RNA, and Genetics
DNA replication produces two DNA molecules,
  1. each with two new strands.
  2. one with two new strands and the other with two original strands.
  3. each with one new strand and one original strand.
  4. each with two original strands.
Grade 9 DNA, RNA, and Genetics
Mutations can be
  1. neutral.
  2. beneficial.
  3. harmful.
  4. all of the above
Grade 9 DNA, RNA, and Genetics
What is heredity?
  1. a communicable disease
  2. the passing of traits from parent to offspring
  3. a lifestyle behavior
  4. none of the above
Grade 9 DNA, RNA, and Genetics
Which series is the correct order of protein synthesis?
  1. transcription, translation, replication
  2. replication, translation, transcription
  3. replication, transcription, translation
Grade 9 DNA, RNA, and Genetics
Which statement describes the importance of tRNA in translation?
  1. tRNA brings the proper amino acids for a series of codons to form a polypeptide chain.
  2. tRNA brings the proper proteins to rRNA to bind together to form an enzyme.
  3. tRNA stays in the nucleus to continue making copies of DNA.
  4. tRNA does all of the above at different times.
Grade 9 DNA, RNA, and Genetics
What is the rod-shaped structure of a DNA molecule threaded around proteins?
  1. characteristic
  2. chromosome
  3. enzyme
  4. heredity
Grade 9 DNA, RNA, and Genetics
According to Mendel, an organism receives for each inherited characteristic
  1. a single gene in which one half of the genetic material is contributed by each parent.
  2. two alleles, one contributed by the father and the other by the mother.
  3. a pair of chromosomes, one from the father and one from the mother.
  4. 46 chromosomes, 23 from the father and 23 from the mother.
Grade 9 DNA, RNA, and Genetics
Recessive traits only tend to be expressed in
  1. homozygous dominant genotypes.
  2. heterozygous recessive genotypes.
  3. homozygous recessive genotypes.
  4. most genotypes.
Grade 9 DNA, RNA, and Genetics
Genetic information is usually stored in
  1. DNA.
  2. host cells.
  3. the fingernails.
  4. the bloodstream.
Grade 9 DNA, RNA, and Genetics
Which is NOT a nitrogen base found in RNA?
  1. thymine
  2. adenine
  3. guanine
  4. uracil
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