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Unit 7 Review

Quiz by Amanda Wood

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17 questions
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  • Q1
    The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans —
    have identical genomes
    share a genetic code
    depend on the same food supply
    both have eukaryotic cells
  • Q2
    Which of the following provides growth and development information to cells?
    deoxyribonucleic acid
    adenosine triphosphate
    cell adhesion molecules
  • Q3
    DNA molecules separate into single strands which are then used to construct two identical strands of DNA.  This process ensures genetic —
  • Q4
    The fact that all organisms use DNA for their genetic material is evidence that all organisms —
    undergo sexual reproduction
    share a common ancestor
    have been genetically engineered
    evolve at the same rate
  • Q5
    Organisms can be classified based on homology, which is shared characteristics inherited from a common ancestor. In the past, homologies were based on studies of anatomical structures and patterns of embryonic development. In more recent years, the use of molecular biology techniques has allowed homologies to be compared at the level of nucleotide sequences. Nucleotide sequence comparisons are possible because all organisms share which of the following?
    Cellular organelles
    DNA bases
    Division of the nuclear chromosomes
    Types of proteins needed for cellular functions
  • Q6
    Scientists use zebra fish to study human genetic diseases because zebra fish and humans share many of the same genetic diseases.Which statement describes why zebra fish experience similar genetic diseases as humans?
    Zebra fish go through embryonic stages similar to those of humans. 
    Zebra fish have nucleotide sequences similar to those of humans.
    Zebra fish have an omnivorous diet similar to that of humans.  
    Zebra fish produce gametes through a process that is similar to that of humans. 
  • Q7
    Genome maps provide the DNA sequences of chromosomes. Some scientists have compared the genome maps of a hedgehog and a sloth. What do these genome maps allow the scientists to determine?
    How closely related the two species are to each other
    The methods of protein synthesis that each species uses
    The color patterns of the offspring of each species
    How much the size ranges of the two species differ
  • Q8
    Which condition is essential for natural selection to result in a new species?
    A long life span
    An inherited variation
    A static environment
    Unlimited resources
  • Q9
    Some organisms have genes that improve their ability to survive and reproduce. If the genes also help their offspring survive and reproduce, then which of the following will most likely increase?
    The number of genes in one chromosome
    The frequency of the genes in one individual
    The number of genes in the species
    The frequency of the genes in the population
  • Q10
    Which of the following is the best statement about natural selection?
    Most populations of organisms evolve to become more and more alike, eventually becoming genetic clones.
    A stable environment and less variations in a population's gene pool promotes evolution of a new species. 
    Some individuals in a population have a variation that gives them an advantage to survive and reproduce.
    If a population becomes isolated from others, the possibility for mutations to occur decreases and extinction results.
  • Q11
    Rabbits normally eat some grass as a food source. In a habitat, a new species of grass is introduced that out-competes most of the original species of grass. The new species of grass contains a chemical that is usually toxic and fatal to most rabbits. Assuming that all rabbits in this habitat will eat some of the new species of grass, how will the presence of the new grass most likely decrease the diversity of the rabbit population in this habitat?
    Only rabbits that eat less grass will survive.
    Only rabbits that can find old grass to eat will survive.
    Only rabbits that are resistant to the chemical will survive.
    Only rabbits that eat more grass will survive.
  • Q12
    The concept of gene flow is demonstrated when a cow is driven off from its herd, joins another herd, and reproduces. When the cow contributes to the gene pool of the new herd, which of these most likely increases?
    Genetic variation
    Reproductive mutations
    Environmental fitness
    Natural selection
  • Q13
    Adaptations that result from natural selection are expected to increase the fitness of an organism. In terms of natural selection, which of the following best describes fitness?
    Being among the strongest organisms in a population
    Being able to survive, find a mate, and produce offspring
    Being able to escape from predators
    Being able to survive long enough to reach the adult stage
  • Q14
    Which scientific concept did Charles Darwin and Alfred Wallace independently discover?
    natural selection
    sexual reproduction
  • Q15
    Which situation is most likely an example of convergent evolution?
    Worms and snakes both move without legs.
    Some bats and birds have wings that allow them to fly
    Squid and humans have eyes similar in structure.
    all of the above

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