Question 1

Cryptochrome absorbs blue light.

Accepted Answer

A) True 
 B)False

Question 2

Brassinosteroids differ from other plant hormones in that they are _______.

Accepted Answer

A)  peptides 
B)  steroids 
C)  derivatives of adenine 
D)  derivatives of aspirin 
E)  derivatives of prostaglandins 
A)  peptides 
B)  steroids 
C)  derivatives of adenine 
D)  derivatives of aspirin 
E)  derivatives of prostaglandins

Question 3

Auxin sprayed on tomato flowers stimulates the __________ to develop without the formation of __________.

Accepted Answer

A)  roots; root hairs 
B)  fruit; ovaries 
C)  seeds; ovaries 
D)  ovary; seeds 
E)  seeds; fruits 
A)  roots; root hairs 
B)  fruit; ovaries 
C)  seeds; ovaries 
D)  ovary; seeds 
E)  seeds; fruits

Question 4

When cytokinins are sprayed on leaves of a cut stem, the leaves turn yellow.
____________________

Accepted Answer

A) True 
 B)False

Question 5

What hypothetical hormone promotes flowering but has never been successfully isolated?

Accepted Answer

A)  florigen 
B)  ubiquitin 
C)  jasmonic acid 
D)  brassinosteroids 
E)  methyl salicylate 
A)  florigen 
B)  ubiquitin 
C)  jasmonic acid 
D)  brassinosteroids 
E)  methyl salicylate

Question 6

Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl salicylate and jasmonic acid.

Accepted Answer

Methyl salicylate triggers a signal tran

Question 7

Jasmonic acid is structurally similar to prostaglandins.

Accepted Answer

A) True 
 B)False

Question 8

Which statement about the internal biological clock is not true:

Accepted Answer

A)  is known as a circadian rhythm. 
B)  is related to the opening and closing of stomata. 
C)  includes the sleep movements observed in some plants, such as beans. 
D)  may involve both phytochrome and cryptochrome. 
E)  disappears abruptly if it is not reset by the rising and setting sun. 
A)  is known as a circadian rhythm. 
B)  is related to the opening and closing of stomata. 
C)  includes the sleep movements observed in some plants, such as beans. 
D)  may involve both phytochrome and cryptochrome. 
E)  disappears abruptly if it is not reset by the rising and setting sun.

Question 9

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-Differentiate between circadian rhythms and photoperiodism.Give examples of each.What regulates these responses?

Accepted Answer

Concepts to Consider: Photoperiodism is

Question 10

In the mechanism of action for auxin, after auxin binds with its receptor, which of the following happens next?

Accepted Answer

A)  Proteins are targeted for destruction. 
B)  Genes are activated. 
C)  Ubiquitin attaches to repressor proteins. 
D)  Transcription occurs. 
E)  The cell wall loosens. 
A)  Proteins are targeted for destruction. 
B)  Genes are activated. 
C)  Ubiquitin attaches to repressor proteins. 
D)  Transcription occurs. 
E)  The cell wall loosens.

Question 11

Which of the following statements concerning the auxin F-box protein is FALSE?

Accepted Answer

A)  It is located in the nucleus. 
B)  It is a type of receptor. 
C)  It is involved in catalyzing the addition of ubiquitin tags. 
D)  Plants have about 700 of them. 
E)  An example is the transport inhibitor response 1 protein. 
A)  It is located in the nucleus. 
B)  It is a type of receptor. 
C)  It is involved in catalyzing the addition of ubiquitin tags. 
D)  Plants have about 700 of them. 
E)  An example is the transport inhibitor response 1 protein.

Question 12

When Pfr absorbs far-red light, the Pfr is converted to Pr.

Accepted Answer

A) True 
 B)False

Question 13

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-regulates thigmomorphogenesis

Accepted Answer

The answer of MATCHING
Match the plant hormone with its description.
a.abscisic...

Question 14

Which hormone promotes cell division and delays senescence in plants?

Accepted Answer

A)  abscisic acid 
B)  auxin 
C)  cytokinin 
D)  ethylene 
E)  gibberellin 
A)  abscisic acid 
B)  auxin 
C)  cytokinin 
D)  ethylene 
E)  gibberellin

Question 15

Which of the following statements concerning phytochrome-induced responses is FALSE?

Accepted Answer

A)  All responses are very rapid and short-term. 
B)  Red light causes potassium channels to open. 
C)  The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. 
D)  Phytochrome activates transcription of the gene for a subunit of rubisco. 
E)  Far-red light causes potassium channels to close. 
A)  All responses are very rapid and short-term. 
B)  Red light causes potassium channels to open. 
C)  The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. 
D)  Phytochrome activates transcription of the gene for a subunit of rubisco. 
E)  Far-red light causes potassium channels to close.

Question 16

Which of the following would be the most likely consequence of removing the apical meristem from a plant?

Accepted Answer

A)  The plant dies. 
B)  The plant remains alive but will not grow again. 
C)  The growth of axillary buds is inhibited. 
D)  The axillary buds die. 
E)  Some axillary buds grow into branches. 
A)  The plant dies. 
B)  The plant remains alive but will not grow again. 
C)  The growth of axillary buds is inhibited. 
D)  The axillary buds die. 
E)  Some axillary buds grow into branches.

Question 17

Any response of a plant to the relative lengths of light and darkness is referred to as:

Accepted Answer

A)  gravitropism. 
B)  photoperiodism. 
C)  phototropism. 
D)  thigmotropism. 
E)  thigmomorphogenesis. 
A)  gravitropism. 
B)  photoperiodism. 
C)  phototropism. 
D)  thigmotropism. 
E)  thigmomorphogenesis.

Question 18

When a root is placed on its side, what happens to the amyloplasts in the root cap cells?

Accepted Answer

A)  They move to the top. 
B)  They settle on the bottom. 
C)  They are digested by amylase. 
D)  They move into the root apical meristem. 
E)  They move into a root hair. 
A)  They move to the top. 
B)  They settle on the bottom. 
C)  They are digested by amylase. 
D)  They move into the root apical meristem. 
E)  They move into a root hair.

Question 19

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-Summarize the effects of each of the six classes of plant hormones.

Accepted Answer

Concepts to Consider: Auxins promote cel

Question 20

Which of the following statements about plant hormones is false?

Accepted Answer

A)  They are organic compounds that act as a highly specific chemical signal. 
B)  They are effective in extremely small amounts. 
C)  They elicit many different responses. 
D)  They stimulate a response at one concentration and inhibit that same response at a different concentration. 
E)  They can be categorized into seven major classes. 
A)  They are organic compounds that act as a highly specific chemical signal. 
B)  They are effective in extremely small amounts. 
C)  They elicit many different responses. 
D)  They stimulate a response at one concentration and inhibit that same response at a different concentration. 
E)  They can be categorized into seven major classes.

Exam 38: Plant Developmental Responses to External and Internal Signals

Cryptochrome absorbs blue light.

Brassinosteroids differ from other plant hormones in that they are _______.

Auxin sprayed on tomato flowers stimulates the __________ to develop without the formation of __________.

When cytokinins are sprayed on leaves of a cut stem, the leaves turn yellow. ____________________

What hypothetical hormone promotes flowering but has never been successfully isolated?

Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl salicylate and jasmonic acid.

Jasmonic acid is structurally similar to prostaglandins.

Which statement about the internal biological clock is not true:

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -Differentiate between circadian rhythms and photoperiodism.Give examples of each.What regulates these responses?

In the mechanism of action for auxin, after auxin binds with its receptor, which of the following happens next?

Which of the following statements concerning the auxin F-box protein is FALSE?

When Pfr absorbs far-red light, the Pfr is converted to Pr.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -regulates thigmomorphogenesis

Which hormone promotes cell division and delays senescence in plants?

Which of the following statements concerning phytochrome-induced responses is FALSE?

Which of the following would be the most likely consequence of removing the apical meristem from a plant?

Any response of a plant to the relative lengths of light and darkness is referred to as:

When a root is placed on its side, what happens to the amyloplasts in the root cap cells?

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -Summarize the effects of each of the six classes of plant hormones.

Which of the following statements about plant hormones is false?

A View of Life

Atoms and Molecules: the Chemical Basis of Life

The Chemistry of Life: Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp: Energy-Releasing Pathways

Photosynthesis: Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna: the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity: Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure, Growth, and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Animal Structure and Function: an Introduction

Protection, Support, and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System: Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology: Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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Auxin sprayed on tomato flowers stimulates the to develop without the formation of .