BIO-152 Exam 1 VCU UPDATED ACTUAL
Exam Questions and CORRECT Answers
What has an impact on the rate at which mutations occur? - CORRECT ANSWER - The
number of times DNA is replicated, frequency of cell division, size of genome
A ___________ mutation originates during meiosis, while a _______ mutation originates during
mitosis - CORRECT ANSWER - germ-line, somatic
_________ evolution occurs when _______ related species become different over time and
__________ evolution occurs when _________ related species become more similar over time -
CORRECT ANSWER - divergent, closely, convergent, distantly
What contributes to the theory of evolution? - CORRECT ANSWER - Anatomical
structures that appear to be modified version from a common ancestor, patterns in fossil record,
biogeographic patterns in dist. of a species
What must be true in order for individuals best suited for growth and reproduction to contribute
disproportionately to the next generation? - CORRECT ANSWER - favorable traits that
can be inherited, and genetic variation within populations
An _________ mutation occurs when part of a chromosome breaks and is reinserted backwards -
CORRECT ANSWER - inversion
_______ _________ uses random genetic changes, it cannot anticipate future needs - CORRECT
ANSWER - Natural Selection
Evolutionary changes = - CORRECT ANSWER - Increased ability of a species to survive
and reproduce in a specific environment
, _________ are the ultimate source of genetic variation - CORRECT ANSWER -
mutations
Shared fundamental features at the level of molecular function and cell organization indicate that
- CORRECT ANSWER - organisms came from a common ancestor
These are examples of:
wing of a bird and bat wing
octupus eye and human eye - CORRECT ANSWER - analogous structures
__________ _________ means organisms are unrelated, but have similar adaptations -
CORRECT ANSWER - convergent evolution
What would happen if a frameshift mutation causes a stop codon to be inserted into a DNA
sequence? - CORRECT ANSWER - the resulting protein may be too short and non-
functional
Whether or not a trait is favorable depends on - CORRECT ANSWER - the environmental
conditions at the time and thus the same traits are not always selected
A frameshift mutation can result from? - CORRECT ANSWER - a single base deletion, or
a single base deletion (must mess up pairs of three)
One reason why mutation rates are down in multicellular organisms is? - CORRECT
ANSWER - the presence of proofreading enzymes
__________ ________ are sites in the DNA where a mutation is most likely to occur and cause a
change in protein structure - CORRECT ANSWER - mutational hotspots
Exam Questions and CORRECT Answers
What has an impact on the rate at which mutations occur? - CORRECT ANSWER - The
number of times DNA is replicated, frequency of cell division, size of genome
A ___________ mutation originates during meiosis, while a _______ mutation originates during
mitosis - CORRECT ANSWER - germ-line, somatic
_________ evolution occurs when _______ related species become different over time and
__________ evolution occurs when _________ related species become more similar over time -
CORRECT ANSWER - divergent, closely, convergent, distantly
What contributes to the theory of evolution? - CORRECT ANSWER - Anatomical
structures that appear to be modified version from a common ancestor, patterns in fossil record,
biogeographic patterns in dist. of a species
What must be true in order for individuals best suited for growth and reproduction to contribute
disproportionately to the next generation? - CORRECT ANSWER - favorable traits that
can be inherited, and genetic variation within populations
An _________ mutation occurs when part of a chromosome breaks and is reinserted backwards -
CORRECT ANSWER - inversion
_______ _________ uses random genetic changes, it cannot anticipate future needs - CORRECT
ANSWER - Natural Selection
Evolutionary changes = - CORRECT ANSWER - Increased ability of a species to survive
and reproduce in a specific environment
, _________ are the ultimate source of genetic variation - CORRECT ANSWER -
mutations
Shared fundamental features at the level of molecular function and cell organization indicate that
- CORRECT ANSWER - organisms came from a common ancestor
These are examples of:
wing of a bird and bat wing
octupus eye and human eye - CORRECT ANSWER - analogous structures
__________ _________ means organisms are unrelated, but have similar adaptations -
CORRECT ANSWER - convergent evolution
What would happen if a frameshift mutation causes a stop codon to be inserted into a DNA
sequence? - CORRECT ANSWER - the resulting protein may be too short and non-
functional
Whether or not a trait is favorable depends on - CORRECT ANSWER - the environmental
conditions at the time and thus the same traits are not always selected
A frameshift mutation can result from? - CORRECT ANSWER - a single base deletion, or
a single base deletion (must mess up pairs of three)
One reason why mutation rates are down in multicellular organisms is? - CORRECT
ANSWER - the presence of proofreading enzymes
__________ ________ are sites in the DNA where a mutation is most likely to occur and cause a
change in protein structure - CORRECT ANSWER - mutational hotspots
