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

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Grade 9 DNA, RNA, and Genetics
Two alleles for pea shape are designated R (round) and r (wrinkled). These alleles are found on
  1. genes.
  2. sex chromosomes.
  3. ribosomes.
  4. homologous chromosomes.
Grade 9 DNA, RNA, and Genetics
Though all of the steps involved in expressing a gene could theoretically be regulated, for most genes, the most important point of control is
  1. amino acid synthesis.
  2. mRNA translation.
  3. RNA transport and localization.
  4. transcription initiation.
Grade 9 DNA, RNA, and Genetics
Which process uses adult somatic cells to make embryos that are genetically the same?
  1. adult stem cell culturing
  2. embryonic stem cell culturing
  3. totipotent cell transfer cloning
  4. somatic cell nuclear transfer cloning
Grade 9 DNA, RNA, and Genetics
If two parents with the dominant phenotype for a trait produce an offspring with the recessive phenotype, then it is probable that
  1. one parent is homozygous.
  2. one parent is heterozygous.
  3. both parents are homozygous.
  4. both parents are heterozygous.
Grade 9 DNA, RNA, and Genetics
Many genes have two forms, or alleles.
  1. True
  2. False
Grade 9 DNA, RNA, and Genetics
Which base pairs with adenine?
  1. T, or thymine
  2. G, or guanine
  3. C, or cytosine
Grade 9 DNA, RNA, and Genetics
Offspring that are the result of mating between genetically similar kinds of parents are called
  1. hybrids.
  2. blending theory.
  3. purebreds.
Grade 9 DNA, RNA, and Genetics
Select all the statements that are true of genetic testing.
  1. Labeled DNA probes can be used to detect specific sequences found in disease-causing alleles.
  2. It is impossible to test parents to find out if they are carriers of cystic fibrosis or Tay-Sachs disease.
  3. Some genetic tests use changes in restriction enzyme cutting sites to identify disease-causing alleles.
  4. DNA testing makes it possible to develop more effective therapy and treatment for individuals affected by genetic disease.
Grade 9 DNA, RNA, and Genetics
Genes in operons are turned off when                 is (are) present.
  1. RNA polymerase
  2. promoters
  3. repressors
  4. inducers
Grade 9 DNA, RNA, and Genetics
The offspring of two different types of true-breeding plants are called
  1. hybrids.
  2. the P generation.
  3. the F2 generation.
  4. false-sterile animals.
Grade 9 DNA, RNA, and Genetics
Females have                 chromosomes.
  1. XYX
  2. XX
  3. YX
  4. XY
Grade 9 DNA, RNA, and Genetics
Which blood types could have a heterozygous genotype?
  1. A
  2. B
  3. AB
  4. O
  5. only A and B
  6. only A, B, and AB
  7. all blood types
Grade 9 DNA, RNA, and Genetics
What is the start codon for RNA?
  1. AGU
  2. UGA
  3. AUG
  4. none of these
Grade 9 DNA, RNA, and Genetics
Which is NOT one of the bases found in DNA?
  1. adenine
  2. guinine
  3. thymine
  4. uracil
  5. cytosine
Grade 9 DNA, RNA, and Genetics
Which is NOT one of the three things that make up RNA?
  1. nitrogenous base pair
  2. sugar
  3. phosphate group
  4. amino acid
Grade 9 DNA, RNA, and Genetics
Scientists can clone carrots.
  1. True
  2. False
Grade 9 DNA, RNA, and Genetics
A unit of hereditary material is the
  1. allele.
  2. chromosome.
  3. centrosome.
  4. gene.
Grade 9 DNA, RNA, and Genetics
Select all the statements that are true of the structure of chromosomes.
  1. The DNA in eukaryotic cells is very loosely packed.
  2. A human cell contains more than one meter of DNA.
  3. Prokaryotic cells contain more DNA than eukaryotic cells do.
  4. The DNA of the smallest human chromosomes is nearly 10 times as long as many bacterial chromosomes.
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