Question 1

Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time, so an up regulation of enzymes would be expected to

Accepted Answer

A)   increase the cell's response that is produced by the reaction catalyzed by the enzyme.
B)   decrease the level of productivity of chemical reactions that rely on them.
C)   have no effect on the rate of reactions catalyzed by the enzymes.
D)   decrease the rate of reactions catalyzed by the enzymes.
E)   both decrease the level of productivity of chemical reactions that rely on them and decrease the rate of reactions catalyzed by the enzymes.F) A) and E)
G) C) and E)

Question 2

During intense exercise our muscles produce lactate and hydrogen ions.Which of the following molecules would be affected by the accumulation of hydrogen ions?

Accepted Answer

A)   cholesterol in the plasma membrane
B)   glucose molecules in the adipose tissue
C)   DNA in the nucleus
D)   the proteins actin and myosin
E)   phospholipids in the membraneF) A) and C)
G) A) and B)

Question 3

Which bases below are purines?
1) adenine
2) cytosine
3) guanine
4) thymine
5) uracil

Accepted Answer

A)   1 and 2
B)   2 and 3
C)   1, 3, and 5
D)   1 and 3
E)   2, 4, and 5F) None of the above
G) All of the above

Question 4

You are a student intern in the research and development department of a pharmaceutical company.You have discovered a compound that destroys the common cold virus in cultured human cells.Chemical characterization reveals that carbon, hydrogen, and oxygen are present, in a 20:40:4 ratio of C:H:O.Which chemical class is this compound? Experiments in rats show that neither oral nor injectable treatment with the compound was effective in destroying the virus.Discuss some possible reasons for this lack of effectiveness.

Accepted Answer

The relatively low amount of oxygen and ...

Question 5

Electrons travel around the center of the atom at high speed forming a(n)

Accepted Answer

A)   atom.
B)   molecule.
C)   element.
D)   nucleus.
E)   shell.F) A) and B)
G) A) and C)

Question 6

This particle has a charge of -1 and a negligible mass.

Accepted Answer

A)   proton
B)   neutron
C)   electron
D)   hydrogen
E)   magnesiumF) All of the above
G) A) and D)

Question 7

The ________ of a solution is the negative logarithm of the hydrogen ion concentration, expressed in moles per liter of solution.

Accepted Answer

The answer of The ________ of a solution is the...

Question 8

A.Distinguish between the mass of a molecule and the mass of a mole, using NaCl in your example.
B.Calculate the mass of a mole of NaCl in g, using the mass of one Da (amu).
C.Calculate the mass of a dozen NaCl molecules, a dozen donuts, and a mole of donuts, assuming a 30 gram donut.

Accepted Answer

A.The mass of a molecule is determined b...

Question 9

Essential amino acids that are used to build proteins

Accepted Answer

A)   exist in twenty six different configurations.
B)   are linked together by ionic chemical bonds in proteins.
C)   can be used medically for both diagnosis and treatment of diseases.
D)   are derived from the foods we eat and digest.
E)   can only be made by cells within our bodies.F) C) and D)
G) C) and E)

Question 10

These result when the carbon atoms in phospholipids share a pair of electrons.

Accepted Answer

A)   a Van der Waals attraction
B)   an ionic bond
C)   a hydrogen bond
D)   a covalent bond
E)   a potassium bondF) B) and C)
G) A) and E)

Question 11

Each amino acid differs from others in the

Accepted Answer

A)   number of central carbon atoms.
B)   size of the amino group.
C)   number of carboxyl groups.
D)   chemical structure of the R group.
E)   number of peptide bonds in the molecule.F) A) and C)
G) B) and C)

Question 12

Which of the following biological molecules does glycogen belong to?

Accepted Answer

A)   carbohydrates
B)   lipids
C)   proteins
D)   nucleotides
E)   lipids and proteinsF) None of the above
G) B) and D)

Question 13

This particle has a charge of +1 and a mass of 1.

Accepted Answer

A)   proton
B)   neutron
C)   electron
D)   molecular oxygen
E)   sodium chlorideF) None of the above
G) C) and D)

Question 14

A typical blood concentration of glucose is 100 mg/dL.The molecular weight of glucose is approximately 180 Daltons.What is the molarity of this solution in millimoles?

Accepted Answer

A)   100
B)   10
C)   0.56
D)   18
E)   5.6F) A) and B)
G) B) and E) E

Question 15

Two methods of protein activation include ________ and ________.

Accepted Answer

A)   exergonic, endogonic
B)   enzymatic, glycolytic
C)   homeostatic, osmotic
D)   mechanistic, covalent bonding
E)   proteolytic, cofactor bindingF) None of the above
G) A) and D)

Question 16

Which of the following statements best describes the relationship between pH and hydrogen ions?

Accepted Answer

A)   pH and hydrogen ions are equivalent.
B)   pH and hydrogen ions are directly proportional.
C)   pH and hydrogen ions are inversely proportional.
D)   pH is always 100 times more than the number of hydrogen ions.
E)   pH and hydrogen ions are independent and unrelated.F) All of the above
G) A) and B) C

Question 17

A fatty acid that contains three double bonds in its carbon chain is said to be

Accepted Answer

A)   saturated.
B)   monounsaturated.
C)   polyunsaturated.
D)   hydrogenated.
E)   carboxylated.F) A) and D)
G) A) and E)

Question 18

The term polar is used to describe molecules because

Accepted Answer

A)   polar covalent molecules are found in colder climates.
B)   polar covalent molecules were first discovered in polar bears.
C)   there are at least two distinct ends of the molecule regarding electron position and the resulting charge.
D)   there are at least two distinct ends of the molecule regarding hydrogen placement.
E)   such molecules are always linear in shape.F) B) and E)
G) D) and E) C

Question 19

Most of the lipid found in the human body is in the form of

Accepted Answer

A)   steroids.
B)   phospholipids.
C)   triglycerides.
D)   prostaglandins.
E)   monoglycerides.F) C) and D)
G) B) and E)

Question 20

Stanley is confused on the similarities and differences between proteins and nucleic acids.Assuming he has learned and understood the basic chemistry, what is the likely source of his confusion? To help him sort this out, make a table or flow chart to explain the structure of these molecules and their relationship to each other.

Accepted Answer

His confusion probably stems from the fa...

Exam 2: Molecular Interactions

Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time, so an up regulation of enzymes would be expected to

Correct Answer
verified

During intense exercise our muscles produce lactate and hydrogen ions.Which of the following molecules would be affected by the accumulation of hydrogen ions?

Correct Answer
verified

Which bases below are purines? 1) adenine 2) cytosine 3) guanine 4) thymine 5) uracil

Correct Answer
verified

Correct Answer
verified
The relatively low amount of oxygen and ...
View Answer

Electrons travel around the center of the atom at high speed forming a(n)

Correct Answer
verified

This particle has a charge of -1 and a negligible mass.

Correct Answer
verified

The ________ of a solution is the negative logarithm of the hydrogen ion concentration, expressed in moles per liter of solution.

Correct Answer
verified

A.Distinguish between the mass of a molecule and the mass of a mole, using NaCl in your example. B.Calculate the mass of a mole of NaCl in g, using the mass of one Da (amu). C.Calculate the mass of a dozen NaCl molecules, a dozen donuts, and a mole of donuts, assuming a 30 gram donut.

Correct Answer
verified
A.The mass of a molecule is determined b...
View Answer

Essential amino acids that are used to build proteins

Correct Answer
verified

These result when the carbon atoms in phospholipids share a pair of electrons.

Correct Answer
verified

Each amino acid differs from others in the

Correct Answer
verified

Which of the following biological molecules does glycogen belong to?

Correct Answer
verified

This particle has a charge of +1 and a mass of 1.

Correct Answer
verified

A typical blood concentration of glucose is 100 mg/dL.The molecular weight of glucose is approximately 180 Daltons.What is the molarity of this solution in millimoles?

Correct Answer
verified
E

Two methods of protein activation include and .

Correct Answer
verified

Which of the following statements best describes the relationship between pH and hydrogen ions?

Correct Answer
verified
C

A fatty acid that contains three double bonds in its carbon chain is said to be

Correct Answer
verified

The term polar is used to describe molecules because

Correct Answer
verified
C

Most of the lipid found in the human body is in the form of

Correct Answer
verified

Correct Answer
verified
His confusion probably stems from the fa...
View Answer

Exam 2: Molecular Interactions

Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time, so an up regulation of enzymes would be expected to

Correct AnswerverifiedShow Answer

During intense exercise our muscles produce lactate and hydrogen ions.Which of the following molecules would be affected by the accumulation of hydrogen ions?

Correct AnswerverifiedShow Answer

Which bases below are purines? 1) adenine 2) cytosine 3) guanine 4) thymine 5) uracil

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThe relatively low amount of oxygen and ...View AnswerShow Answer

Electrons travel around the center of the atom at high speed forming a(n)

Correct AnswerverifiedShow Answer

This particle has a charge of -1 and a negligible mass.

Correct AnswerverifiedShow Answer

The ________ of a solution is the negative logarithm of the hydrogen ion concentration, expressed in moles per liter of solution.

Correct AnswerverifiedShow Answer

A.Distinguish between the mass of a molecule and the mass of a mole, using NaCl in your example. B.Calculate the mass of a mole of NaCl in g, using the mass of one Da (amu). C.Calculate the mass of a dozen NaCl molecules, a dozen donuts, and a mole of donuts, assuming a 30 gram donut.

Correct AnswerverifiedA.The mass of a molecule is determined b...View AnswerShow Answer

Essential amino acids that are used to build proteins

Correct AnswerverifiedShow Answer

These result when the carbon atoms in phospholipids share a pair of electrons.

Correct AnswerverifiedShow Answer

Each amino acid differs from others in the

Correct AnswerverifiedShow Answer

Which of the following biological molecules does glycogen belong to?

Correct AnswerverifiedShow Answer

This particle has a charge of +1 and a mass of 1.

Correct AnswerverifiedShow Answer

A typical blood concentration of glucose is 100 mg/dL.The molecular weight of glucose is approximately 180 Daltons.What is the molarity of this solution in millimoles?

Correct AnswerverifiedE

Two methods of protein activation include ________ and ________.

Correct AnswerverifiedShow Answer

Which of the following statements best describes the relationship between pH and hydrogen ions?

Correct AnswerverifiedC

A fatty acid that contains three double bonds in its carbon chain is said to be

Correct AnswerverifiedShow Answer

The term polar is used to describe molecules because

Correct AnswerverifiedC

Most of the lipid found in the human body is in the form of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedHis confusion probably stems from the fa...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The relatively low amount of oxygen and ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A.The mass of a molecule is determined b...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Two methods of protein activation include and .

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
His confusion probably stems from the fa...
View Answer