BIOL 212 EXAM 2 CORE GENETICS AND
MOLECULAR BIOLOGY CONCEPTS REVIEW
2026
◉ Most of the water taken up by a plant is ________.
a.
lost during transpiration
b.
converted to carbon dioxide
c.
used as a solvent
d.
used to keep cells turgid
e.
used as a hydrogen source in photosynthesis.
Answer: a.
lost during transpiration
◉ Water flows into the source end of a sieve tube because ________.
a.
water pressure outside the sieve tube forces in water
,b.
sucrose has been actively transported into the sieve tube, making it
hypertonic
c.
sucrose has been transported out of the sieve tube by active
transport
d.
sucrose has diffused into the sieve tube, making it hypotonic
e.
the companion cell of a sieve tube actively pumps in water.
Answer: b.
sucrose has been actively transported into the sieve tube, making it
hypertonic
◉ Which cells in a root form a protective barrier to the vascular
system where all materials must move through the symplast?
a.
endodermis
b.
epidermis
c.
pericycle
d.
,cortex
e.
exodermis.
Answer: a.
endodermis
◉ The function of the Casparian Strip is:
a.
to prevent water from getting into the xylem.
b.
to prevent water from moving out of the system.
c.
to keep ions from moving into the xylem cells.
d.
to attract water to the xylem cells..
Answer: b.
to prevent water from moving out of the system.
◉ Root hairs are most important to a plant because they ________.
a.
provide a habitat for nitrogen-fixing bacteria
b.
, store starches
c.
increase the surface area for absorption
d.
anchor a plant in the soil
e.
contain xylem tissue.
Answer: c.
increase the surface area for absorption
◉ How is the structure of kinesin related to its function?
a.
Kinesin has two intertwined polypeptides that make up the stalk
and enable it to contract and shorten.
b.
The kinesin tail has an ATP binding site to fuel its activities.
c.
Kinesin has two heads to attach to the vesicle being moved and a tail
region that attaches to microtubules.
d.
Kinesin has a tail region that binds to vesicles and two heads that
can attach to microtubules..
MOLECULAR BIOLOGY CONCEPTS REVIEW
2026
◉ Most of the water taken up by a plant is ________.
a.
lost during transpiration
b.
converted to carbon dioxide
c.
used as a solvent
d.
used to keep cells turgid
e.
used as a hydrogen source in photosynthesis.
Answer: a.
lost during transpiration
◉ Water flows into the source end of a sieve tube because ________.
a.
water pressure outside the sieve tube forces in water
,b.
sucrose has been actively transported into the sieve tube, making it
hypertonic
c.
sucrose has been transported out of the sieve tube by active
transport
d.
sucrose has diffused into the sieve tube, making it hypotonic
e.
the companion cell of a sieve tube actively pumps in water.
Answer: b.
sucrose has been actively transported into the sieve tube, making it
hypertonic
◉ Which cells in a root form a protective barrier to the vascular
system where all materials must move through the symplast?
a.
endodermis
b.
epidermis
c.
pericycle
d.
,cortex
e.
exodermis.
Answer: a.
endodermis
◉ The function of the Casparian Strip is:
a.
to prevent water from getting into the xylem.
b.
to prevent water from moving out of the system.
c.
to keep ions from moving into the xylem cells.
d.
to attract water to the xylem cells..
Answer: b.
to prevent water from moving out of the system.
◉ Root hairs are most important to a plant because they ________.
a.
provide a habitat for nitrogen-fixing bacteria
b.
, store starches
c.
increase the surface area for absorption
d.
anchor a plant in the soil
e.
contain xylem tissue.
Answer: c.
increase the surface area for absorption
◉ How is the structure of kinesin related to its function?
a.
Kinesin has two intertwined polypeptides that make up the stalk
and enable it to contract and shorten.
b.
The kinesin tail has an ATP binding site to fuel its activities.
c.
Kinesin has two heads to attach to the vesicle being moved and a tail
region that attaches to microtubules.
d.
Kinesin has a tail region that binds to vesicles and two heads that
can attach to microtubules..
