Question 1

Because the major clue to the mechanism of hearing is speed, sounds are detected through

Accepted Answer

A)  7TM receptors. 
B)  amiloride-sensitive ion channels. 
C)  chemical receptors. 
D)  mechanosensory ion channels. 
E)  None of the answers is correct. 
A)  7TM receptors. 
B)  amiloride-sensitive ion channels. 
C)  chemical receptors. 
D)  mechanosensory ion channels. 
E)  None of the answers is correct.

Question 2

Which of the following is a tastant category?

Accepted Answer

A)  acidic 
B)  oily 
C)  fruity 
D)  creamy 
E)  umami 
A)  acidic 
B)  oily 
C)  fruity 
D)  creamy 
E)  umami

Question 3

Which ions signal a sour taste as they pass through ion channels?

Accepted Answer

A)  hydrogen 
B)  sodium 
C)  potassium 
D)  chloride 
E)  ammonium 
A)  hydrogen 
B)  sodium 
C)  potassium 
D)  chloride 
E)  ammonium

Question 4

How were most OR proteins and ligands identified?

Accepted Answer

A combination of techniques wa

Question 5

The daily rhythms of activity and restfulness are known as _____ rhythms.

Accepted Answer

A)  biennial 
B)  diurnal 
C)  circadian 
D)  arcadian 
E)  None of the answers is correct. 
A)  biennial 
B)  diurnal 
C)  circadian 
D)  arcadian 
E)  None of the answers is correct.

Question 6

What evidence is there that sweet receptors are heterodimeric?

Accepted Answer

Studies in knockout mice indic

Question 7

Odor and some taste sensations are dependent on the stimulus of specific 7TM receptors causing triggering of _________________ stimulation.

Accepted Answer

The answer of Odor and some taste sensations are dependent...

Question 8

What structural features are important in the light-detecting function of the chromophore 11-cis-retinal?

Accepted Answer

A)  It is a polyene with alternating single and double bonds forming an unsaturated electron network. 
B)  It is easily ionized to carry a charge. 
C)  It has several linked cyclic rings. 
D)  It is very water soluble. 
E)  It is highly colored. 
A)  It is a polyene with alternating single and double bonds forming an unsaturated electron network. 
B)  It is easily ionized to carry a charge. 
C)  It has several linked cyclic rings. 
D)  It is very water soluble. 
E)  It is highly colored.

Question 9

What condition is characterized by the inability to smell certain compounds?

Accepted Answer

A)  dysosmia 
B)  specific anosmia 
C)  ageusia 
D)  parosmia 
E)  Kallmann syndrome 
A)  dysosmia 
B)  specific anosmia 
C)  ageusia 
D)  parosmia 
E)  Kallmann syndrome

Question 10

Which G-protein subunit is expressed in taste buds?

Accepted Answer

A)  transducin 
B)  Rho 
C)  $\alpha$olf 
D)  gustducin 
E)  GNAL 
A)  transducin 
B)  Rho 
C)  $\alpha$olf 
D)  gustducin 
E)  GNAL

Question 11

Specific odors are detected and transmitted to the olfactory bulb by ____________________.

Accepted Answer

The answer of Specific odors are detected and transmitted to...

Question 12

How many active olfactory genes are found in rats and humans? Explain the discrepancy.

Accepted Answer

Rats contain as many as 1000 genes, whil

Question 13

What is the end point for the taste transduction pathways regardless of the diverse nature of the detection process?

Accepted Answer

Bitter, sweet, and umami tastants are de

Question 14

Many of the receptors involved in transmission of stimuli contain multiple transmembrane domains. Why?

Accepted Answer

Several parts of the protein,

Question 15

Describe the steps leading to the detection of light.

Accepted Answer

A photon of light causes a conformationa

Question 16

What type of receptor detects pain?

Accepted Answer

A)  nociceptor 
B)  baroreceptor 
C)  chemoreceptor 
D)  osmoreceptor 
E)  proprioceptor 
A)  nociceptor 
B)  baroreceptor 
C)  chemoreceptor 
D)  osmoreceptor 
E)  proprioceptor

Question 17

Which of the following animals has the most highly developed color perception?

Accepted Answer

A)  dog 
B)  human 
C)  iguana 
D)  honeybee 
E)  chicken 
A)  dog 
B)  human 
C)  iguana 
D)  honeybee 
E)  chicken

Question 18

Which of the following taste sensations is not detected by 7TM receptors?

Accepted Answer

A)  umami (delicious) 
B)  sweet 
C)  salty 
D)  bitter 
E)  All of the answers are correct. 
A)  umami (delicious) 
B)  sweet 
C)  salty 
D)  bitter 
E)  All of the answers are correct.

Question 19

How are the molecular mechanisms for salty taste sensations and nonpainful touch sensations similar?

Accepted Answer

Both are a combination of sens

Question 20

What protein has been identified as a potential transduction channel for detecting sound from fruit fly experiments?

Accepted Answer

A)  ankyrin repeats 
B)  helix-turn-helix protein 
C)  NompC (No mechanoreceptor potential) 
D)  hear2 
E)  bundl 
A)  ankyrin repeats 
B)  helix-turn-helix protein 
C)  NompC (No mechanoreceptor potential) 
D)  hear2 
E)  bundl

Exam 33: Sensory Systems

Because the major clue to the mechanism of hearing is speed, sounds are detected through

Which of the following is a tastant category?

Which ions signal a sour taste as they pass through ion channels?

How were most OR proteins and ligands identified?

The daily rhythms of activity and restfulness are known as _____ rhythms.

What evidence is there that sweet receptors are heterodimeric?

Odor and some taste sensations are dependent on the stimulus of specific 7TM receptors causing triggering of _________________ stimulation.

What structural features are important in the light-detecting function of the chromophore 11-cis-retinal?

What condition is characterized by the inability to smell certain compounds?

Which G-protein subunit is expressed in taste buds?

Specific odors are detected and transmitted to the olfactory bulb by ____________________.

How many active olfactory genes are found in rats and humans? Explain the discrepancy.

What is the end point for the taste transduction pathways regardless of the diverse nature of the detection process?

Many of the receptors involved in transmission of stimuli contain multiple transmembrane domains. Why?

Describe the steps leading to the detection of light.

What type of receptor detects pain?

Which of the following animals has the most highly developed color perception?

Which of the following taste sensations is not detected by 7TM receptors?

How are the molecular mechanisms for salty taste sensations and nonpainful touch sensations similar?

What protein has been identified as a potential transduction channel for detecting sound from fruit fly experiments?

Biochemistry: an Evolving Science

Protein Composition and Structure

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Oxidative Phosphorylation

Catalytic Strategies

Regulatory Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

The Light Reactions of Photosynthesis

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

The Biosynthesis of Amino Acids

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, Repair, and Recombination

Rna Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

The Immune System

Molecular Motors

Drug Development

Filters