Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants. Evidence points to a need for a minimum daily dose of selenium of 55 F1F1F1S1F1F1F10g. How many moles of selenocysteine (C3H7NO2Se, 168 g /mol) can be synthesized using this amount of selenium?

A) 3.3 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol B) 7.0 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol C) 3.3 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 mol D) 7.0 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 mol E) 3.7 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol A) 3.3 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol B) 7.0 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol C) 3.3 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 mol D) 7.0 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 mol E) 3.7 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F107 mol

The Mg2F1F1F1S1F1F1F10 ion plays a significant role in the human body by

A) maintaining osmotic pressure. B) forming structure support for the body. C) transmitting nerve impulses. D) balancing ion flow in the bloodstream. E) participating in ATP hydrolysis and ADP phosphorylation. A) maintaining osmotic pressure. B) forming structure support for the body. C) transmitting nerve impulses. D) balancing ion flow in the bloodstream. E) participating in ATP hydrolysis and ADP phosphorylation.

Exam 21: The Main Group Elements: Life and the Periodic Table

The photosynthesis of carbohydrates from carbon dioxide and water is a redox reaction. Metalloenzymes containing manganese assist in the transfer of electrons. (1) Write the reaction equation for the photosynthetic production of glucose. (2) Identify the species that is oxidized. (3) Identify the species that is reduced. (4) Identify the number of electrons transferred per mole of glucose produced.

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Question 1

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(1)
(2) Oxygen goes from 2 to 0, so it is oxidized.
(3) Carbon goes from 4 to 0, so it is reduced.
(4) To produce a molecule of glucose, 6 atoms of carbon must each receive 4 electrons to reduce their oxidation number from 4 to 0. So to produce a mole of glucose, 24 moles of electrons must be transferred.

The average concentration of calcium in the human body is 15 mg/g of body mass. What is the mass of calcium in the body of a person weighing 150 lb? (1 lb  454 g)

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Stomach acid is 0.16 M HCl. What is the pH of stomach acid?

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How much energy must be expended by a cell to transport 1 mole of sodium ions across a membrane with an electrochemical potential of 62 mV in order to maintain this potential?

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Question 4

The cation BiO^ is found in some over-the-counter antacids. Draw the Lewis structure of this cation that satisfies the octet rule for both atoms. Based on this Lewis structure, this cation has ________ of nonbonding electrons.

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Question 5

An essential biological element ________

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Question 6

The concentration of a trace essential element in the body is typically in the range of ________ per gram of body mass.

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Question 7

Pacemakers implanted in the chests of patients with certain heart conditions are powered by a lithium/iodine PVP battery, where PVP represents polyvinylpyridine. The cell reaction and standard cell potential are given below. The standard reduction potential for Li/Li is 3.05 V. What species is oxidized in this reaction? 3.59 V

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Question 8

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants. Evidence points to a need for a minimum daily dose of selenium of 55 g. How many moles of selenocysteine (C₃H₇NO₂Se, 168 g /mol) can be synthesized using this amount of selenium?

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Question 9

Magnesium is found in which one of the following important biological molecules?

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Question 10

Which element, by mass, is most abundant in the human body?

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Question 11

Which ion is important in transmitting nerve impulses?

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Question 12

Ions need to move in and out of cells through cell membranes. Direct diffusion of ions through the lipid bilayer of the cell membrane is difficult because ions are not soluble in these nonpolar regions. Describe three mechanisms by which ions are transported through cell membranes.

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Question 13

Fluoridation to prevent tooth decay replaces ________ with fluoride in hydroxyapatite.

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Question 14

Plants convert nitrate into ammonia by using enzymes called ________

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Question 15

Hearing aid batteries utilize a zinc/air electrochemical cell. The reduction half-reactions and standard reduction potentials for this cell are given below. What is the standard cell potential of zinc/air cell? 1.249 V

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Question 16

Which of the following is not a characteristic of a nonessential biological element?

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Question 17

The active site of an enzyme typically contains ________

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Question 18

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass. What is this concentration in ppm (parts per million)?

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Question 19

The Mg²^ ion plays a significant role in the human body by

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Question 20

Showing 1 - 20 of 96

The average concentration of calcium in the human body is 15 mg/g of body mass. What is the mass of calcium in the body of a person weighing 150 lb? (1 lb  454 g)

Stomach acid is 0.16 M HCl. What is the pH of stomach acid?

How much energy must be expended by a cell to transport 1 mole of sodium ions across a membrane with an electrochemical potential of 62 mV in order to maintain this potential?

The cation BiO^ is found in some over-the-counter antacids. Draw the Lewis structure of this cation that satisfies the octet rule for both atoms. Based on this Lewis structure, this cation has ________ of nonbonding electrons.

An essential biological element ________

The concentration of a trace essential element in the body is typically in the range of ________ per gram of body mass.

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants. Evidence points to a need for a minimum daily dose of selenium of 55 g. How many moles of selenocysteine (C₃H₇NO₂Se, 168 g /mol) can be synthesized using this amount of selenium?

Magnesium is found in which one of the following important biological molecules?

Which element, by mass, is most abundant in the human body?

Which ion is important in transmitting nerve impulses?

Ions need to move in and out of cells through cell membranes. Direct diffusion of ions through the lipid bilayer of the cell membrane is difficult because ions are not soluble in these nonpolar regions. Describe three mechanisms by which ions are transported through cell membranes.

Fluoridation to prevent tooth decay replaces ________ with fluoride in hydroxyapatite.

Plants convert nitrate into ammonia by using enzymes called ________

Hearing aid batteries utilize a zinc/air electrochemical cell. The reduction half-reactions and standard reduction potentials for this cell are given below. What is the standard cell potential of zinc/air cell? 1.249 V

Which of the following is not a characteristic of a nonessential biological element?

The active site of an enzyme typically contains ________

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass. What is this concentration in ppm (parts per million)?

The Mg²^ ion plays a significant role in the human body by

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

Transition Metals: Biological and Medical Applications

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Exam 21: The Main Group Elements: Life and the Periodic Table

The average concentration of calcium in the human body is 15 mg/g of body mass. What is the mass of calcium in the body of a person weighing 150 lb? (1 lb  454 g)

Stomach acid is 0.16 M HCl. What is the pH of stomach acid?

How much energy must be expended by a cell to transport 1 mole of sodium ions across a membrane with an electrochemical potential of 62 mV in order to maintain this potential?

The cation BiO is found in some over-the-counter antacids. Draw the Lewis structure of this cation that satisfies the octet rule for both atoms. Based on this Lewis structure, this cation has ________ of nonbonding electrons.

An essential biological element ________

The concentration of a trace essential element in the body is typically in the range of ________ per gram of body mass.

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants. Evidence points to a need for a minimum daily dose of selenium of 55 g. How many moles of selenocysteine (C3H7NO2Se, 168 g /mol) can be synthesized using this amount of selenium?

Magnesium is found in which one of the following important biological molecules?

Which element, by mass, is most abundant in the human body?

Which ion is important in transmitting nerve impulses?

Ions need to move in and out of cells through cell membranes. Direct diffusion of ions through the lipid bilayer of the cell membrane is difficult because ions are not soluble in these nonpolar regions. Describe three mechanisms by which ions are transported through cell membranes.

Fluoridation to prevent tooth decay replaces ________ with fluoride in hydroxyapatite.

Plants convert nitrate into ammonia by using enzymes called ________

Hearing aid batteries utilize a zinc/air electrochemical cell. The reduction half-reactions and standard reduction potentials for this cell are given below. What is the standard cell potential of zinc/air cell? 1.249 V

Which of the following is not a characteristic of a nonessential biological element?

The active site of an enzyme typically contains ________

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass. What is this concentration in ppm (parts per million)?

The Mg2 ion plays a significant role in the human body by

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

Transition Metals: Biological and Medical Applications

Filters

The cation BiO^ is found in some over-the-counter antacids. Draw the Lewis structure of this cation that satisfies the octet rule for both atoms. Based on this Lewis structure, this cation has ________ of nonbonding electrons.

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants. Evidence points to a need for a minimum daily dose of selenium of 55 g. How many moles of selenocysteine (C₃H₇NO₂Se, 168 g /mol) can be synthesized using this amount of selenium?

The Mg²^ ion plays a significant role in the human body by