BIOLOGY 1500 TEST #6 QUESTIONS
AND ANSWERS
Which of the following must occur for a population of gray squirrels (that all belong to
the same species) to evolve into two separate species of squirrels?
- The population of gray squirrels must evolve adaptations, e.g. to a new food
source.
- Genetic differences must build up between two different populations of gray
squirrels.
- The population must double in size over time to accommodate twice as many
species.
- Some of the gray squirrels must hybridize with other species of squirrels in the
area. - ANSWER-Genetic differences must build up between two different
populations of gray squirrels.
During the rise of the Himalayas, the mountains reached a height at which neither
the lowland Hb nor the high altitude Hb worked well for the geese. Which statement
best describes the situation at this time point?
- The alleles for high altitude Hb and lowland Hb are both present in the population
and neither allele is spreading much.
- The two alleles merge into a 'mid-altitude' allele, which allows geese to fly well at all
levels.
- Many animals do not survive migration across the mountains and the goose
species went extinct
- Natural selection increases the frequency of the high altitude Hb in preparation for
future rise in mountain height
- Because neither allele works well, natural selection generates a new allele that
works best at this altitude - ANSWER-The alleles for high altitude Hb and lowland Hb
are both present in the population and neither allele is spreading much.
Suppose a cell has a defect in which it makes an insufficient number of tRNA
molecules with the anti-codon CCA. How will this affect the cell? You may refer to
the table above if necessary.
- The cell will have difficulty incorporating glycine (Gly) into its proteins.
- The cell will be unable to bind enough codons together to make a protein.
- The cell will be unable to detach the ribosome from the mRNA.
- The cell is likely to suffer from frequent mutations in its DNA.
- The cell will have difficulty incorporating proline (Pro) into its proteins. – ANSWER-
The cell will have difficulty incorporating glycine (Gly) into its proteins.
When you buy packaged meat in a supermarket, the cling wrap that covers the
package allows O2 to pass through. What is the reason for this?
AND ANSWERS
Which of the following must occur for a population of gray squirrels (that all belong to
the same species) to evolve into two separate species of squirrels?
- The population of gray squirrels must evolve adaptations, e.g. to a new food
source.
- Genetic differences must build up between two different populations of gray
squirrels.
- The population must double in size over time to accommodate twice as many
species.
- Some of the gray squirrels must hybridize with other species of squirrels in the
area. - ANSWER-Genetic differences must build up between two different
populations of gray squirrels.
During the rise of the Himalayas, the mountains reached a height at which neither
the lowland Hb nor the high altitude Hb worked well for the geese. Which statement
best describes the situation at this time point?
- The alleles for high altitude Hb and lowland Hb are both present in the population
and neither allele is spreading much.
- The two alleles merge into a 'mid-altitude' allele, which allows geese to fly well at all
levels.
- Many animals do not survive migration across the mountains and the goose
species went extinct
- Natural selection increases the frequency of the high altitude Hb in preparation for
future rise in mountain height
- Because neither allele works well, natural selection generates a new allele that
works best at this altitude - ANSWER-The alleles for high altitude Hb and lowland Hb
are both present in the population and neither allele is spreading much.
Suppose a cell has a defect in which it makes an insufficient number of tRNA
molecules with the anti-codon CCA. How will this affect the cell? You may refer to
the table above if necessary.
- The cell will have difficulty incorporating glycine (Gly) into its proteins.
- The cell will be unable to bind enough codons together to make a protein.
- The cell will be unable to detach the ribosome from the mRNA.
- The cell is likely to suffer from frequent mutations in its DNA.
- The cell will have difficulty incorporating proline (Pro) into its proteins. – ANSWER-
The cell will have difficulty incorporating glycine (Gly) into its proteins.
When you buy packaged meat in a supermarket, the cling wrap that covers the
package allows O2 to pass through. What is the reason for this?
