Biology 2e exam questions and
their correct answers
People who have leukemia, a cancer that affects white
blood cells, are often given Cytarabine. This drug
inhibits the synthesis of DNA. Which phase of the cell
cycle is most affected by Cytarabine?
S phase
A single-celled organism can be classified as a
prokaryote based on the absence of -
a nucleus
Cells pass through a G2 checkpoint before entering
mitosis. Ideally, if DNA damage is detected, the cells
do not enter mitosis until the damage is repaired. Why
is DNA damage repaired before cells enter mitosis?
So that healthy daughter cells are produced, allowing the
organism to continue growing
Sc ientists can bioengineer skin in a laboratory to
treat severe burns and other types of skin injuries.
This bioengineered tissue is grown from living cells.
The cellular process that enables the cells to grow
and develop into tissue
.mitosis
Which phase of mitosis is occurring in the cell
indicated by the arrow
Anaphase
Which of these occurs just before the cell enters the
G2 stage of the cell cycle ?
DNA replicates
, Telophase is a stage of a cellular process that begins
after the chromosomes have moved to opposite poles
of the cell. During which cellular process does
telophase occur?
Mitosis
The model represents the change in the DNA content
of a cell during the cell cycle. Which part of the model
represents the S phase
Part II
An environmental change that removed which of these
would cause the most instability in the ecosystem?
organisms from the ecosystem
Zooplankton
Which of the following is most likely to cause the
greatest disruption to an ecosystem
Emptying an aquarium containing non-native species into
a local waterway
Which of these will most likely happen if the plateau
pikas are completely removed from the Tibetan
plateau grasslands?
The ecosystem will become unstable because predators
will have fewer prey, the birds will have fewer nesting
sites, and the area downriver will become vulnerable to
flooding without the burrows to aerate the soil and provide
drainage for monsoon rains.
Roads are often built through forests for industrial
purposes or as la nd is develo for residential and
commercial needs. How would road construction
throug h a forest most likely affect the ecosystem?
The natural succession of vegetation would change
their correct answers
People who have leukemia, a cancer that affects white
blood cells, are often given Cytarabine. This drug
inhibits the synthesis of DNA. Which phase of the cell
cycle is most affected by Cytarabine?
S phase
A single-celled organism can be classified as a
prokaryote based on the absence of -
a nucleus
Cells pass through a G2 checkpoint before entering
mitosis. Ideally, if DNA damage is detected, the cells
do not enter mitosis until the damage is repaired. Why
is DNA damage repaired before cells enter mitosis?
So that healthy daughter cells are produced, allowing the
organism to continue growing
Sc ientists can bioengineer skin in a laboratory to
treat severe burns and other types of skin injuries.
This bioengineered tissue is grown from living cells.
The cellular process that enables the cells to grow
and develop into tissue
.mitosis
Which phase of mitosis is occurring in the cell
indicated by the arrow
Anaphase
Which of these occurs just before the cell enters the
G2 stage of the cell cycle ?
DNA replicates
, Telophase is a stage of a cellular process that begins
after the chromosomes have moved to opposite poles
of the cell. During which cellular process does
telophase occur?
Mitosis
The model represents the change in the DNA content
of a cell during the cell cycle. Which part of the model
represents the S phase
Part II
An environmental change that removed which of these
would cause the most instability in the ecosystem?
organisms from the ecosystem
Zooplankton
Which of the following is most likely to cause the
greatest disruption to an ecosystem
Emptying an aquarium containing non-native species into
a local waterway
Which of these will most likely happen if the plateau
pikas are completely removed from the Tibetan
plateau grasslands?
The ecosystem will become unstable because predators
will have fewer prey, the birds will have fewer nesting
sites, and the area downriver will become vulnerable to
flooding without the burrows to aerate the soil and provide
drainage for monsoon rains.
Roads are often built through forests for industrial
purposes or as la nd is develo for residential and
commercial needs. How would road construction
throug h a forest most likely affect the ecosystem?
The natural succession of vegetation would change
