Biology 2015

During which step of signal transduction is a second messenger released into the cytoplasm?
$$\begin{array}{ll}{\text { a. reception }} & {\text { c. transduction }} \\ {\text { b. response }} & {\text { d. final step }}\end{array}$$

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
It is present in a gaseous form

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
Grapes can grow larger and exhibit stem elongation

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
Stomata close when a plant is water-stressed.

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
Stems bend toward the sun.

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
It inhibits plant senescence

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
It causes leaf abscission.

For questions $2-8,$ match each statement with a hormone in the key. Answers can be used more than once.
KEY:
a. auxin
b. gibberellin
c. cytokinin
d. ethylene
e. abscisic acid
It is responsible for apical dominance

Primary metabolites are needed for ______, while secondary metabolites are produced for ______.
a. growth, signal transduction
b. normal cell functioning, defense
c. defense, growth
d. signal transduction, normal cell functioning

The sensors in the cells of the root cap are called
a. mitochondria.
b. central vacuoles.
c. statoliths.
d. chloroplasts.
e. intermediate filaments.

A student places 25 corn seeds in a large pot and allows the seeds to germinate in total darkness. Which of the following growth or movement activities would the seedlings exhibit?
a. gravitropism, as the roots grow down and the shoots grow up
b. phototropism, as the shoots search for light
c. thigmotropism, as seedlings move toward the edge of the pot
d. All of these are possible.

The snapping of a Venus flytrap is an example of a
a. phototropism.
b. gravitropism.
c. circadian rhythm.
d. turgor movement.
e. thigmotropism.

A plant requiring a dark period of at least 14 hours will
a. flower if a 14-hour night is interrupted by a flash of light.
b. not flower if a 14-hour night is interrupted by a flash of light.
c. not flower if the days are 14 hours long.
d. not flower if the nights are longer than 14 hours.
e. Both b and c are correct.

Which of the following is false about the phytochrome protein?
a. There are two convertible forms.
b. It primarly absorbes blue wavelengths of light.
c. It is involved in seed germination.
d. It is involved in plant sensing of spacing.

A morning glory flower opens during the day and closes at night. This response is due to its
a. phototropism.
b. circadian rhythm.
c. hours in the darkness.
d. temperature.