Biochemistry

Phenol is treated with Fremys salt, (KSO3)2NO, followed by SnCl2/H2O. What is the product of these ...

Phenol is treated with Fremys salt, (KSO3)2NO, followed by SnCl2/H2O. What is the product of these ...

Phenol is treated with Fremys salt, (KSO3)2NO, followed by SnCl2/H2O. What is the product of these manipulations?
 

tarapratt95   26   1 Reply

jana_akkari

The following diol is prepared from propanal (CH3CH2CHO) and 3-bromopropanol. Which derivatives will ...

The following diol is prepared from propanal (CH3CH2CHO) and 3-bromopropanol. Which derivatives will ...

The following diol is prepared from propanal (CH3CH2CHO) and 3-bromopropanol. Which derivatives will be among intermediate products in this transformation?
 

kekebab001   53   1 Reply

joeypmulllz

Which of the following would yield the desired Grignard reagent when treated with Mgo in ether? ...

Which of the following would yield the desired Grignard reagent when treated with Mgo in ether? ...

Which of the following would yield the desired Grignard reagent when treated with Mgo in ether?
  1.4-bromopentanol
  2.4-bromobutyric acid
  3.4-bromobutan-2-one
  4.4-bromopentene
  5.4-bromophenol

rachelkimq   289   2 Replies

rachelkimq

What is the reduction product of the compound below?

What is the reduction product of the compound below?

What is the reduction product of the compound below?
 

bubblegum123   22   1 Reply

gecko.girl

Nitric oxide is synthesized by NO synthase from what?

Nitric oxide is synthesized by NO synthase from what?

Nitric oxide is synthesized by NO synthase from what?
 a. lysine
 b. glutamine
 c. arginine
 d. asparagine

shoppa   33   1 Reply

freddieg23

Zinc finger proteins generally share what characteristic?

Zinc finger proteins generally share what characteristic?

Zinc finger proteins generally share what characteristic?
 a. They contain a SH2 domain.
 b. They bind steroid hormones.
 c. They are DNA-binding proteins.
 d. They are membrane-bound proteins.

Revolver38   29   1 Reply

sandyb2

All of the following statements concerning nicotine receptors are true except:

All of the following statements concerning nicotine receptors are true except:

All of the following statements concerning nicotine receptors are true except:
 a. Nicotine receptors are cation channels.
 b. The nicotine receptor is a transmembrane glycoprotein.
 c. Acetylcholine causes a conformational change in

lovelyturret   35   1 Reply

physico

Normal metabolic activity can occur only when cells are at least ____ H2O.

Normal metabolic activity can occur only when cells are at least ____ H2O.

Normal metabolic activity can occur only when cells are at least ____ H2O.
 a. 23
 b. 45
 c. 53
 d. 65
 e. 85

shoppa   43   1 Reply

neontoast91

Which of the following statements about water is false?

Which of the following statements about water is false?

Which of the following statements about water is false?
 a. Water can serve as both a donor and an acceptor in hydrogen bond formation.
 b. Water has an unusually high dielectric constant.
 c. Pure liquid water consists of H2O molecul

98lindsey   30   1 Reply

canelo

The average lifetime of hydrogen bonds between water molecules is about how long?

The average lifetime of hydrogen bonds between water molecules is about how long?

The average lifetime of hydrogen bonds between water molecules is about how long?
 a. 10 picoseconds
 b. 10 nanoseconds
 c. 10 microseconds
 d. 10 seconds
 e. 10 minutes

redheadprincess   30   1 Reply

bethclip

The net attraction that nonpolar solute molecules experience for one another in water is called:

The net attraction that nonpolar solute molecules experience for one another in water is called:

The net attraction that nonpolar solute molecules experience for one another in water is called:
 a. colligative interaction
 b. osmotic pressure
 c. semipermeability
 d. hydrophobic interaction
 e. hydrophilic interaction

mahi   47   2 Replies

mahi

An amphiphilic molecule: (Multiple Choice)

An amphiphilic molecule: (Multiple Choice)

An amphiphilic molecule:
 a. contains both strongly polar and strongly nonpolar groups
 b. has no biological relevance
 c. always has a highly ordered structure
 d. is quite different than an amphipathic molecule
 e. all of

stalmoney   43   1 Reply

dthomas18

The constant Kw, the ion product of water, can be written as:

The constant Kw, the ion product of water, can be written as:

The constant Kw, the ion product of water, can be written as:
 a. Keq = 1014 = H+OH-
 b. Keq = 10-14 = H+OH-
 c. Keq = 10-12 = H+OH-
 d. Keq = 10-7 = H+OH-
 e. none of the above

alexiswells   37   1 Reply

hellokristi4

If the pH of a solution is 7, then the concentration of hydrogen ions in that solution is:

If the pH of a solution is 7, then the concentration of hydrogen ions in that solution is:

If the pH of a solution is 7, then the concentration of hydrogen ions in that solution is:
 a. 1014
 b. 10-14
 c. 107
 d. 10-7
 e. none of the above

Miller123   61   1 Reply

PrincessAwesome

PH = pKa + log10 A-/HA:

PH = pKa + log10 A-/HA:

pH = pKa + log10 A-/HA:
 a. is known as the Henderson-Hasselbalch equation
 b. provides a general solution to the quantitative treatment of acid-base equilibria
 c. allows the pH of a solution composed of a weak electrolyte to be calc

sarah_verduzco1   65   1 Reply

jogden1011

Phosphoric acid, H3PO4: (Multiple Choice)

Phosphoric acid, H3PO4: (Multiple Choice)

Phosphoric acid, H3PO4:
 a. is a polyprotic acid
 b. requires two equivalents of OH- to neutralize it
 c. is a strong acid
 d. has a pKa of 2.38
 e. all of the above

kristina92293   68   1 Reply

physico

Phosphoric acid, H3PO4, serves to buffer the intracellular fluid of cells at physiological pH ...

Phosphoric acid, H3PO4, serves to buffer the intracellular fluid of cells at physiological pH ...

Phosphoric acid, H3PO4, serves to buffer the intracellular fluid of cells at physiological pH because:
 a. it is a naturally occurring amino acid
 b. phosphate is only found in an organic form in biological molecules
 c. its pK2 lies

yjuhen   60   2 Replies

yjuhen

Which of the following statements is true of histidine?

Which of the following statements is true of histidine?

Which of the following statements is true of histidine?
 a. The concentration of free histidine is low in cells.
 b. Protein-bound and dipeptide histidine may be the dominant buffering system in some cells.
 c. The pKa for dissociatio

98lindsey   52   1 Reply

gecko.girl

The bicarbonate buffer system of blood plasma works well because:

The bicarbonate buffer system of blood plasma works well because:

The bicarbonate buffer system of blood plasma works well because:
 a. the concentration of H2CO3 is maintained relatively constant
 b. the system includes both gaseous and dissolved CO2
 c. the concentration of H2PO4 is maintained rel

98lindsey   52   1 Reply

PurpleMonkey

Which of the following is true about buffer systems?

Which of the following is true about buffer systems?

Which of the following is true about buffer systems?
 a. They are typically made up of a strong acid and a strong base mixed together.
 b. The pH will vary greatly in the region of the titration curve where HA = A-.
 c. They will have

ugai_kyut   34   1 Reply

ashleyjohnson81

Which of the following has the highest affinity for protons?

Which of the following has the highest affinity for protons?

Which of the following has the highest affinity for protons?
 a. lactic acid - pKa = 3.86
 b. pyruvic acid - pKa = 2.50
 c. acetic acid - pKa = 4.76
 d. cysteine acid - pKa = 1.71
 e. succinic acid - pKa = 4.21

mahi   40   1 Reply

mousesareplural

A buffer of HPO42-/H2PO4- has a pH of 7.4 . What is the ratio of HPO42-/H2PO4- in this buffer?

A buffer of HPO42-/H2PO4- has a pH of 7.4 . What is the ratio of HPO42-/H2PO4- in this buffer?

A buffer of HPO42-/H2PO4- has a pH of 7.4 . What is the ratio of HPO42-/H2PO4- in this buffer?
 a. 1.6
 b. 0.62
 c. 2 x 10-3
 d. 7.0
 e. 1 x 10-14

omrglss   77   1 Reply

hsprouse

The pH of a solution with a hydroxyl ion concentration of 4 x 10-3 is:

The pH of a solution with a hydroxyl ion concentration of 4 x 10-3 is:

The pH of a solution with a hydroxyl ion concentration of 4 x 10-3 is:
 a. 11.6
 b. 3.6
 c. 2.4
 d. 10.4
 e. 12.6

lovelyturret   40   2 Replies

lovelyturret

The internal energy of a system:

The internal energy of a system:

The internal energy of a system:
 a. depends only on the present state of the system
 b. depends on the pathway by which the system came to its present condition
 c. does not change if energy flows in or out of the system
 d. is

crownlessking   59   1 Reply

Beehappy2

The second law of thermodynamics states that:

The second law of thermodynamics states that:

The second law of thermodynamics states that:
 a. the entropy of a system plus surroundings is unchanged by irreversible processes
 b. systems tend to proceed from disordered to more ordered states
 c. naturally occurring processes pr

ksultz   48   1 Reply

car2065596

A van't Hoff plot is used to:

A van't Hoff plot is used to:

A van't Hoff plot is used to:
 a. determine the entropy change for a reaction
 b. determine the enthalpy change for a reaction
 c. determine the free energy change for a reaction
 d. determine the equilibrium constant for a react

Larrhea   52   1 Reply

salmajed1

For a reaction to proceed spontaneously:

For a reaction to proceed spontaneously:

For a reaction to proceed spontaneously:
 a. DH must be negative.
 b. DS must be negative
 c. DG must be negative.
 d. DT must be positive.
 e. DG must be positive.

Brooke.catlin   41   1 Reply

Findingskate61

If DG for a reaction is negative, then:

If DG for a reaction is negative, then:

If DG for a reaction is negative, then:
 a. DS is always negative.
 b. DS is always positive.
 c. DS can be either negative or positive.
 d. DH is always positive.
 e. DH is always negative.

lacoya15   42   1 Reply

Nrcp1978

The free energy of hydrolysis of ATP is:

The free energy of hydrolysis of ATP is:

The free energy of hydrolysis of ATP is:
 a. unaffected by the concentration of metal ions
 b. increased when metal ions such as magnesium are present
 c. decreased when metal ions such as magnesium are present
 d. unaffected by

Linalovespickle   32   2 Replies

Linalovespickle

There are ___ commonly occurring amino acids.

There are ___ commonly occurring amino acids.

There are ___ commonly occurring amino acids.
 a. 4
 b. 5
 c. 40
 d. 20
 e. none of the above

Miller123   38   1 Reply

P.liania

At neutral pH (pH = 7): (Multiple Choice)

At neutral pH (pH = 7): (Multiple Choice)

At neutral pH (pH = 7):
 a. the carboxyl group exists as -COOH and the amino group exists as -NH3+
 b. the carboxyl group exists as -COO- and the amino group exists as -NH3+
 c. the carboxyl group exists as -COO- and the amino group e

ksultz   43   1 Reply

Nickluna@msn.co

At neutral pH (pH = 7): (Multiple Choice)

At neutral pH (pH = 7): (Multiple Choice)

At neutral pH (pH = 7):
 a. acidic amino acids have a net positive charge
 b. basic amino acids have a net positive charge
 c. acidic amino acids have no charge
 d. basic amino acids have no charge
 e. none of the above

stalmoney   40   1 Reply

hurricanechris7

Which of the following is not a nonpolar amino acid?

Which of the following is not a nonpolar amino acid?

Which of the following is not a nonpolar amino acid?
 a. isoleucine
 b. valine
 c. methionine
 d. phenylalanine
 e. arginine

lovelyturret   52   1 Reply

131231

Which of the following amino acids contain(s) a sulfur atom?

Which of the following amino acids contain(s) a sulfur atom?

Which of the following amino acids contain(s) a sulfur atom?
 a. leucine serine
 b. methionine, cysteine
 c. histidine
 d. arginine
 e. tyrosine, phenylalanine

redheadprincess   45   1 Reply

salmajed1

The hormone epinephrine (also known as adrenaline) is derived from which amino acid?

The hormone epinephrine (also known as adrenaline) is derived from which amino acid?

The hormone epinephrine (also known as adrenaline) is derived from which amino acid?
 a. phenylalanine
 b. glycine
 c. tyrosine
 d. histidine
 e. arginine

Jovaini   33   1 Reply

poot10

Which of the following amino acid(s) is (are) neutral and polar at pH = 7?

Which of the following amino acid(s) is (are) neutral and polar at pH = 7?

Which of the following amino acid(s) is (are) neutral and polar at pH = 7?
 a. tyrosine
 b. serine
 c. asparagine
 d. threonine
 e. all of the above

98lindsey   26   1 Reply

mwarner93

Amino acids can be readily detected and quantified by reaction with:

Amino acids can be readily detected and quantified by reaction with:

Amino acids can be readily detected and quantified by reaction with:
 a. zwitterion
 b. hydroxyproline
 c. 5,5'-Dithiobis (2-nitrobenzoic acid)
 d. ninhydrin (triketohydrindene hydrate)
 e. all of the above

alshernandez   39   1 Reply

joeypmulllz

Which of the following statements is false regarding enantiomers?

Which of the following statements is false regarding enantiomers?

Which of the following statements is false regarding enantiomers?
 a. Enantiomeric molecules display optical activity.
 b. Enantiomers are nonsuperimposable mirror image isomers.
 c. Enantiomeric molecules are able to rotate the plane

lovelyturret   39   1 Reply

MSROGERS

Which of the following amino acids has (have) two chiral centers?

Which of the following amino acids has (have) two chiral centers?

Which of the following amino acids has (have) two chiral centers?
 a. threonine
 b. proline
 c. isoleucine
 d. a and b
 e. a and c

yjuhen   46   1 Reply

hentrus

Which of the following best describes the order of elution of a mixture of asparagine, lysine, and ...

Which of the following best describes the order of elution of a mixture of asparagine, lysine, and ...

Which of the following best describes the order of elution of a mixture of asparagine, lysine, and serine (from first to last) from a cation exchange column? You must also know the one-letter codes for the amino acids to answer this question.
 

bubblegum123   51   1 Reply

elizabethxo1