Biology 117 final exam review
#40 on 4th exam - correct answer-??
1. First event of action potential - correct answer-The membrane is at rest and being
maintained by the Na+/K+ATPase pump and leak channels.
2. Second event of action potential - correct answer-K+ channels are closed while Na+
channels are opened. Na+ floods into the membrane.
3. Third event of action potential - correct answer-Na+ channels close, while some K+
channels being to open.
4. Fourth event of action potential - correct answer-Na+ channels are closed while K+ floods
out of the cell membrane.
5. Fifth event of action potential - correct answer-Hyperpolarization occurs.
6. Sixth event of action potential - correct answer-The membrane is at rest and being
maintained by the Na+/K+ATPase pump and leak channels.
A damn breaks in a forested area and flood waters destroy high numbers within a population
of snakes. The remaining members of the population mate to produce the next generation.
The newly created generation has drastically different allele frequency when compared to the
snake population prior to the flooding event. This change is best explained by? - correct
answer-The Bottleneck Effect
A mutation within a DNA sequence occurs. The mutation changes the amino acid that will
later be translated. What is the LEAST probable outcome of this mutation? - correct
answer-The change in the amino acid sequence will change the function of the protein for
the better (advantageous mutation).
A mutation within a gene of the developmental regulatory cascade is responsible for legs
growing where they do not belong. A mutation in which type of gene is most likely
responsible for the phenotype in this image? - correct answer-Homeotic gene
A population of frogs resides in cheat lake. The majority of this population has an average
leg length opt 2-6 inches are found in the population in low numbers. A new species of flying
insect appears in the area. These insects are fast flyers and the frogs that are able to catch
these insects need greater leg power to jump higher and faster than previous generations.
Overtime, the average leg length of the majority of frogs in Cheat Lake becomes 6 inches.
This is an example of what type of selection? - correct answer-Directional selection
A population of sea stars has a total population of 5,750 individuals. There are 3,100
individuals with long arms (which is the dominant trait for these organisms) and 2,650
, individuals with short arms (which is the recessive trait). - correct answer-1. Allele frequency
for the recessive allele in the population: 0.679
2. Phenotype frequency for long arms: 0.539
3. Genotype frequency for heterozygotes: 0.436
A scientist engineers a virus that contains the gene thought to provide bacterial resistance to
the antibiotic vancomycin. The scientist then takes a culture of bacteria and divides it in two.
One portion is allowed to incubate with the previously mentioned virus, while the other is not.
Both bacterial cultures are then placed onto petri plates whose media contain vancomycin.
Only the culture grown previously with viruses shows growth of bacterial colonies.
How did these bacteria FIRST come to have resistance to this antibiotic? - correct
answer-Transduction
According to Fick's Law, which of the following statements would increase the rate of
diffusion across a tissue used for gas exchange? - correct answer-Increase the difference in
partial pressure of the gases on either side of the membrane.
According to the morphospecies concept, if two organisms share similar DNA sequences,
they are considered to be the same species. (T/F) - correct answer-False
All animals are heterotrophic. (T/F) - correct answer-True
All heterokayotic mycelium is thought to be diploid after plasmogamy. (T/F) - correct
answer-False
All neurotransmitters invoke a excitatory response in neurons. (T/F) - correct answer-False
All protists, fungi, and animals are thought to be eukaryotic organisms. (T/F) - correct
answer-True
All vertebrates are chordates, but not all chordates are vertebrates. (T/F) - correct
answer-True
Allopatric Speciation usually occurs in freely breeding populations due to isolation based on
preferences. (T/F) - correct answer-False
Although both bacteria and archaea are considered to be "prokaryotes", archaea are more
closely related to eukaryotes than to bacteria. - correct answer-True
An action potential results when a nerve cell - correct answer-is depolarized to its threshold
potential
Antigens are ___________, whereas antibodies are _____________. - correct answer-A.
present on the foreign molecule; produced in response to a specific foreign molecule
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