Bio 100a Final Exam Questions With Complete Solutions
.
Mass extinctions occur mostly because of:
A)
competition.
B)
gradually changing environmental conditions.
C)
natural selection.
D)
extraordinary and sudden changes to the environment.
E)
poor fitness. Correct Answers D)
extraordinary and sudden changes to the environment.
10.
During gene flow, where do the genes flow to?
A)
The genes flow through cyberspace.
B)
The genes flow from a locus on one chromosome to another
locus on the same chromosome.
C)
The genes flow into and out of the population due to migration
of individuals from one population to another.
D)
The genes do not flow at all—flow is a mathematical metaphor
that means gene frequencies are unstable and are drifting from
one number to another.
E)
,The genes flow from a locus on one chromosome to a locus on
another chromosome. Correct Answers C)
The genes flow into and out of the population due to migration
of individuals from one population to another.
11.
An electron in a photosynthetic pigment that is excited to a
higher energy state generally has one of two fates. The first
option is the electron can return to its resting, unexcited state
and, in the process, energy is released. Some of this energy can
be transferred to a nearby molecule, bumping electrons in that
molecule to a higher energy state. What is the other possible
fate?
A)
The excited electron can split into tiny particles and gamma
rays.
B)
The excited electron itself can be passed to another molecule.
C)
The excited electron can absorb energy to further aid other
reactions.
D)
Another molecule can grab that electron and further excite it.
E)
The excited electron can be further excited to the point where it
takes on both proton and electron properties. Correct Answers
B)
The excited electron itself can be passed to another molecule.
11.
,Which of the following is not necessary for the evolution of a
trait by natural selection?
A)
heritability of the trait
B)
Both the first and second choices are not necessary for the
evolution of a trait by natural selection.
C)
variation in fitness due to variation in the trait
D)
large population size
E)
trait variation Correct Answers D)
large population size
12.
Adaptation:
A)
cannot occur in environments influenced by humans.
B)
occurs for physical traits but not behaviors.
C)
refers both to the process by which organisms become better
matched to their environment and to the features of an organism
that make it more fit than other individuals.
D)
is possible only when there is no mutation.
E)
is responsible for the fact that porcupines are at an unusually
high risk of predation. Correct Answers C)
, refers both to the process by which organisms become better
matched to their environment and to the features of an organism
that make it more fit than other individuals.
12.
Covalent bonds are bonds in which:
A)
the weak negative charge from one atom associates with the
weak positive charge from another atom.
B)
two atoms share electrons.
C)
one atom donates an electron to another atom.
D)
one atom donates a proton to another atom, and the resulting
positive and negative molecules are bound to each other.
E)
two atoms' nuclei fuse. Correct Answers B)
two atoms share electrons.
12.
The "synthesis" portion of photosynthesis consumes energy
from ATP and NADPH, which are products of:
A)
the "photo" reactions.
B)
the breakdown of rubisco.
C)
G3P synthesis.
D)
the Calvin cycle.
.
Mass extinctions occur mostly because of:
A)
competition.
B)
gradually changing environmental conditions.
C)
natural selection.
D)
extraordinary and sudden changes to the environment.
E)
poor fitness. Correct Answers D)
extraordinary and sudden changes to the environment.
10.
During gene flow, where do the genes flow to?
A)
The genes flow through cyberspace.
B)
The genes flow from a locus on one chromosome to another
locus on the same chromosome.
C)
The genes flow into and out of the population due to migration
of individuals from one population to another.
D)
The genes do not flow at all—flow is a mathematical metaphor
that means gene frequencies are unstable and are drifting from
one number to another.
E)
,The genes flow from a locus on one chromosome to a locus on
another chromosome. Correct Answers C)
The genes flow into and out of the population due to migration
of individuals from one population to another.
11.
An electron in a photosynthetic pigment that is excited to a
higher energy state generally has one of two fates. The first
option is the electron can return to its resting, unexcited state
and, in the process, energy is released. Some of this energy can
be transferred to a nearby molecule, bumping electrons in that
molecule to a higher energy state. What is the other possible
fate?
A)
The excited electron can split into tiny particles and gamma
rays.
B)
The excited electron itself can be passed to another molecule.
C)
The excited electron can absorb energy to further aid other
reactions.
D)
Another molecule can grab that electron and further excite it.
E)
The excited electron can be further excited to the point where it
takes on both proton and electron properties. Correct Answers
B)
The excited electron itself can be passed to another molecule.
11.
,Which of the following is not necessary for the evolution of a
trait by natural selection?
A)
heritability of the trait
B)
Both the first and second choices are not necessary for the
evolution of a trait by natural selection.
C)
variation in fitness due to variation in the trait
D)
large population size
E)
trait variation Correct Answers D)
large population size
12.
Adaptation:
A)
cannot occur in environments influenced by humans.
B)
occurs for physical traits but not behaviors.
C)
refers both to the process by which organisms become better
matched to their environment and to the features of an organism
that make it more fit than other individuals.
D)
is possible only when there is no mutation.
E)
is responsible for the fact that porcupines are at an unusually
high risk of predation. Correct Answers C)
, refers both to the process by which organisms become better
matched to their environment and to the features of an organism
that make it more fit than other individuals.
12.
Covalent bonds are bonds in which:
A)
the weak negative charge from one atom associates with the
weak positive charge from another atom.
B)
two atoms share electrons.
C)
one atom donates an electron to another atom.
D)
one atom donates a proton to another atom, and the resulting
positive and negative molecules are bound to each other.
E)
two atoms' nuclei fuse. Correct Answers B)
two atoms share electrons.
12.
The "synthesis" portion of photosynthesis consumes energy
from ATP and NADPH, which are products of:
A)
the "photo" reactions.
B)
the breakdown of rubisco.
C)
G3P synthesis.
D)
the Calvin cycle.
