Biology 109 Exam 2 Questions and
Answers 100% Pass
Slows cell growth often antagonizing the action of other hormones - ✔✔Abscisic Acid
release from embryo signals seeds to break dormancy and germinate - ✔✔Gibberellins
accumulates in leaves when plant begins to wilt, causing stomata to close rapidly -
✔✔Abscisic Acid
synthetic forms of this hormone are widely employed as herbicides that target broad
leaf weeds such a dandelions - ✔✔Auxins
In the etiolation response, the function of protein kinases 1 and 2 is to - ✔✔Activate
specific transcription factors in the nucleus
Slowing of stem elongation, thickening and curvature of the stem to start growing
horizontally are all part of a growing shoot's response to - ✔✔Ethylene
Transcriptional regulation and post-transcriptional modification are most closely
associated with which stage of a signal transduction pathway - ✔✔Response
In addition to absorbing water and minerals from the soil, this type of root provides
enhanced anchoring of the plant to the substrate - ✔✔Taproot
These sugar-conducting cells lack nuclei and ribosomes and are intimately associated
with companion cells - ✔✔Sieve-tube elements
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, In the figure below right, the cells in the region enclosed by the middle part of a stem
constitute the - ✔✔Zone of elongation
As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. The
nail is about 1.5 meters from the ground. Fifteen years later, you return and discover the
tree has grown to a height of 30 meters. How tall is the nail above the ground? - ✔✔1.5
meters
Based on the ABC model, what would be the structure of a flower that had normal
expression of genes A and B but lacked expression of gene C? - ✔✔Sepal-petal-petal-
sepal
Suppose George Washington completely removed the bark from around the base of a
cherry tree but was stopped by his father before cutting the tree down. The leaves
retained their normal appearance for several weeks, but the tree eventually died. The
tissue that George left functional was the - ✔✔Xylem
This root structure ensures that all water and dissolved substances must pass through a
cell membrane before entering the stele (vascular cylinder) - ✔✔Casparian strip
Photosynthesis ceases when leaves wilt, mainly becuase - ✔✔Stomata closes, preventing
CO2 from entering the leaf
If _P = 0.3 MPa and _S = -0.45 MPa, the resulting _ is - ✔✔-0.15 MPa
What regulates the flow of water through the xylem? - ✔✔The evaporation of water
from the leaves
The early morning sun stimulates stomata to open by - ✔✔Stimulating the activity of
proton pumps in the plasma membrane of guard cells
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
Answers 100% Pass
Slows cell growth often antagonizing the action of other hormones - ✔✔Abscisic Acid
release from embryo signals seeds to break dormancy and germinate - ✔✔Gibberellins
accumulates in leaves when plant begins to wilt, causing stomata to close rapidly -
✔✔Abscisic Acid
synthetic forms of this hormone are widely employed as herbicides that target broad
leaf weeds such a dandelions - ✔✔Auxins
In the etiolation response, the function of protein kinases 1 and 2 is to - ✔✔Activate
specific transcription factors in the nucleus
Slowing of stem elongation, thickening and curvature of the stem to start growing
horizontally are all part of a growing shoot's response to - ✔✔Ethylene
Transcriptional regulation and post-transcriptional modification are most closely
associated with which stage of a signal transduction pathway - ✔✔Response
In addition to absorbing water and minerals from the soil, this type of root provides
enhanced anchoring of the plant to the substrate - ✔✔Taproot
These sugar-conducting cells lack nuclei and ribosomes and are intimately associated
with companion cells - ✔✔Sieve-tube elements
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, In the figure below right, the cells in the region enclosed by the middle part of a stem
constitute the - ✔✔Zone of elongation
As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. The
nail is about 1.5 meters from the ground. Fifteen years later, you return and discover the
tree has grown to a height of 30 meters. How tall is the nail above the ground? - ✔✔1.5
meters
Based on the ABC model, what would be the structure of a flower that had normal
expression of genes A and B but lacked expression of gene C? - ✔✔Sepal-petal-petal-
sepal
Suppose George Washington completely removed the bark from around the base of a
cherry tree but was stopped by his father before cutting the tree down. The leaves
retained their normal appearance for several weeks, but the tree eventually died. The
tissue that George left functional was the - ✔✔Xylem
This root structure ensures that all water and dissolved substances must pass through a
cell membrane before entering the stele (vascular cylinder) - ✔✔Casparian strip
Photosynthesis ceases when leaves wilt, mainly becuase - ✔✔Stomata closes, preventing
CO2 from entering the leaf
If _P = 0.3 MPa and _S = -0.45 MPa, the resulting _ is - ✔✔-0.15 MPa
What regulates the flow of water through the xylem? - ✔✔The evaporation of water
from the leaves
The early morning sun stimulates stomata to open by - ✔✔Stimulating the activity of
proton pumps in the plasma membrane of guard cells
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
