Basic Biology Exam Quiz

39 Questions | Total Attempts: 53

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Basic Biology Exam Quiz

Questions and Answers
  • 1. 
    Two closely related species of Carabid beetle live in the same habitat. Although mating between the two species occurs frequently, no eggs are fertilized and no offspring are produced. This is most likely an example of:
    • A. 

      Postzygotic isolation

    • B. 

      Sexual selection

    • C. 

      Reduced hybrid fertility

    • D. 

      Mechanical isolation

  • 2. 
    The cambrian explosion describes the
    • A. 

      Formation of the universe.

    • B. 

      Appearance of most major animal groups in the fossil record

    • C. 

      Asteroid impact at the end of the Cretaceous that cause the extinction of the dinosaurs.

    • D. 

      adaptive radiation seen for many different groups of organisms in the Hawaiian islands.

  • 3. 
    In humans, polydactyly is inherited as an autosomal dominant trait; the individual in this picture has two thumbs. This mutation is an example of:
    • A. 

      Heterochrony

    • B. 

      Homeosis

    • C. 

      Paedomorphosis

  • 4. 
    For sympatric speciation, which of the following statements are true?I. Allele frequency changes are shared between geographically isolated populations. II. There is no obvious physical barrier to gene flow. III. Geographically isolated populations accumulate genetic changes over time and this eventually leads to reproductive isolation IV. Changes in chromosome number can isolate populations living in the same place.
    • A. 

      I and IV

    • B. 

      II and IV

    • C. 

      II and III

  • 5. 
    This image shows a triacylglycerol (a dietary fat). This is an example of a(n) ___________________ fat and fat comprised of only this type of molecule is expected to be _____________ at room temperature.
    • A. 

      saturated ; solid

    • B. 

      Unsaturated ; solid

    • C. 

      Unsaturated ; liquid

    • D. 

      Saturated ; liquid

  • 6. 
    If the females of a species prefer to mate with males that have a specific morphological trait, that trait may change over time through:
    • A. 

      Sexual selection.

    • B. 

      Frequency dependent selection.

    • C. 

      Artificial selection.

    • D. 

      Stabilizing selection.

  • 7. 
    Allele frequencies in the gene pool of a small population may change randomly, by chance alone. This type of change is called:
    • A. 

      Adaptation

    • B. 

      Random matin

    • C. 

      Artificial selection

    • D. 

      Genetic drift

  • 8. 
    The equation ___________________________ describes genotype frequencies in a population for a gene with three alleles.
    • A. 

      P2 + 2pq + q2 + 2pr + 2qr + r2 = 1

    • B. 

      P + q + r = 3

    • C. 

      p2 + 2pq +q2 = 1

  • 9. 
    Grizzly bears and polar bears have many genetic and morphological differences and are considered to be separate species. Recently, hunters in Canada have discovered “pizzlies,” which are the hybrid offspring of grizzly bears and polar bears. This year, an F2 hybrid was also found, indicating that pizzlies can reproduce. Based upon this information, which species concept does NOT apply to grizzly bears and polar bears in this area if they are still considered different species?
    • A. 

      He biological species concept.

    • B. 

      The morphological species concept.

    • C. 

      All of the species concepts apply to brown bears and polar bears.

    • D. 

      The evolutionary/phylogenetic species concept.

  • 10. 
    During digestion, macromolecules are broken down by enzymes secreted by various organs in the digestive tract. These are ____________________ reactions that ______________ water molecules during the process of the reaction.
    • A. 

      Catabolic/add

    • B. 

      Anabolic/add

    • C. 

      Catabolic/release

    • D. 

      Catabolic/release

  • 11. 
    Polymers of carbohydrates are made of monosaccharides that can be bound together in different configurations. The plant carbohydrate(s) _____________________ cannot be broken into smaller molecules by the digestive enzymes that animals produce.
    • A. 

      Cellulose

    • B. 

      Glycogen

    • C. 

      Amylose

    • D. 

      Cellulose and amylose

  • 12. 
    Which of the following sets of tRNA anticodons would associate with this mRNA molecule during translation?mRNA 5' AAU CCA UUU 3'
    • A. 

      3’UUA 5’ 3’GGU 5’ 3’AAA 5’

    • B. 

      3’TTA 5’ 3’GGT 5’ 3’AAA 5’

    • C. 

      3’AAA 5’ 3’UGG 5’ 3’AUU 5’

  • 13. 
    In frequency-dependent selection:
    • A. 

      The more common phenotype has a selective advantage.

    • B. 

      Two distinct phenotypes in the population are favored.

    • C. 

      The more common phenotype is selected against.

  • 14. 
    Which of the following statements about transcription is correct?
    • A. 

      Transcription results in a polypeptide chain that is further modified to make a functional protein.

    • B. 

      One strand of DNA serves as a template during transcription

    • C. 

      Transcription produces a double-stranded RNA molecule.

  • 15. 
    A biologist discovers a primitive organism new to science. Which of the following would be the best prediction about its molecular makeup?
    • A. 

      Its monosaccharides will serve as important structural molecules

    • B. 

      Its DNA will have unusual nucleotides.

    • C. 

      Its proteins will serve as the primary energy storage molecules.

    • D. 

      Its proteins will contain some of the same amino acids found in humans.

  • 16. 
    Kasugamycin is an antibiotic that kills bacteria by interfering with tRNAs ability to bind to the bacteria’s ribosomes, disrupting:
    • A. 

      DNA replication

    • B. 

      Transcription

    • C. 

      Translation

  • 17. 
    The amino acid tyrosine (Tyr) is coded for by the mRNA codons UAU and UAC. This is an example of ___________________ in the genetic code.
    • A. 

      Universality

    • B. 

      Redundancy

    • C. 

      Ambiguity

  • 18. 
    DNA and RNA nucleotides:
    • A. 

      differ in both the sugar they contain and some of the nitrogenous bases.

    • B. 

      use the same nitrogenous bases.

    • C. 

      Have different types of phosphate groups.

  • 19. 
    Which of the following is NOT an assumption of Hardy Weinberg equilibrium?
    • A. 

      Small population size

    • B. 

      Random mating

    • C. 

      No migration

  • 20. 
    N the diagram to the right, the arrow from letter A points to the ______ end of a newly synthesized DNA strand and the arrow from letter B points to the _____ end of another newly synthesized strand.
    • A. 

      A=3' B=5'

    • B. 

      A=5' B=5'

    • C. 

      A=3' B=3'

  • 21. 
    Given the DNA template strand shown below, what will be the sequence of nucleotides produced during its replication by DNA polymerase?DNA Template : 3’ ATTGGCATGCCGAGACC 5’
    • A. 

      3’ CCAGAGCCGTACGGTTA 5’

    • B. 

      3’ TGCCGATTGCATACGGA 5’

    • C. 

      3’ GGTCTCGGCATGCCAAT 5’

  • 22. 
    He plant Delphinium nudicaule (Red larkspur) is pollinated by hummingbirds, whileD. decorum (Coastal larkspur) is pollinated by bumblebees. The pollinators are attracted to the differences in flower shape between the species. D. nudicauleflowers resemble the flower buds (juvenile stage) of D. decorum flowers. This is an example of:
    • A. 

      Heterchrony

    • B. 

      Homeosis

    • C. 

      Paedomorphosis

    • D. 

      Heterchrony and paedomorphosis

  • 23. 
    _________________________ is not a function of proteins.
    • A. 

      Digestion of food

    • B. 

      Storage of genetic information in the nucleus

    • C. 

      Coloration of the skin and hair

  • 24. 
    The hydrogen bonds formed between water molecules are responsible for all of these properties of water except:
    • A. 

      Lower density of ice

    • B. 

      High heat capacity

    • C. 

      Variable transmission of different wavelenghts of light

    • D. 

      Cohesion of water molecules

  • 25. 
    The San Blas Islands are a small cluster of isolated islands off a densely forested coast of Panama. In the small population of indigenous people who live there, the frequency of albinism is much higher than it is in other human populations. Anthropologists hypothesize the islands were colonized several hundred years ago by a very small population from mainland Panama. The high incidence of albinism in this population is most likely due to:
    • A. 

      The bottleneck effect

    • B. 

      The founder effect

    • C. 

      Non random mating

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