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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
ksultz   74   2 Replies
6 years ago
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
6 years ago
A buffer solution (Multiple Choice)
A buffer solution (Multiple Choice)
A buffer solution
 a. is used to control the pH of a solution
  b. contains at least 100 times more of a weak acid than its conjugate base
  c. contains at least 100 times less of a weak acid than its conjugate base
  d. always h
ksultz   45   1 Reply
6 years ago
A buffer solution : (Multiple Choice)
A buffer solution : (Multiple Choice)
A buffer solution
 A) is used to control the pH of a solution
  B) contains at least 100 times more of a weak acid than its conjugate base
  C) contains at least 100 times less of a weak acid than its conjugate base
  D) alway
bdiddydog   52   1 Reply
6 years ago
A buffer solution at pH 10 has a ratio of HA/A of 10 . What is the pKa of the acid?
A buffer solution at pH 10 has a ratio of HA/A of 10 . What is the pKa of the acid?
A buffer solution at pH 10 has a ratio of HA/A of 10 . What is the pKa of the acid?
 a. 8
  b. 9
  c. 10
  d. 11
  e. 12
shoppa   61   2 Replies
6 years ago
A buffer solution at pH 10 has a ratio of HA/A of 10. What is the pKa of the acid?
A buffer solution at pH 10 has a ratio of HA/A of 10. What is the pKa of the acid?
A buffer solution at pH 10 has a ratio of HA/A of 10. What is the pKa of the acid?
 A) 8
  B) 9
  C) 10
  D) 11
  E) 12
avaaaaa   60   1 Reply
6 years ago
A can of soda has a volume of 355 mL. The area of a circle is given as A = r2, where r is the radius ...
A can of soda has a volume of 355 mL. The area of a circle is given as A = r2, where r is the radius ...
A can of soda has a volume of 355 mL. The area of a circle is given as A = r2, where r is the radius of the circle, so the volume of the can is given by V = ( r2)h, where h is the height of the can. If a particular can has a height of 12.2 cm what is
Linalovespickle   67   1 Reply
6 years ago
A cancer patient receives an injection of the drug on March 1. Suppose that the patient must receive ...
A cancer patient receives an injection of the drug on March 1. Suppose that the patient must receive ...
A cancer patient receives an injection of the drug on March 1. Suppose that the patient must receive a second injection once the amount of the drug decreases to less than 6% in his or her body. On approximately what day should the cancer patient sche
samualson   90   2 Replies
5 years ago
A carbohydrate with 4 carbons is called a:
A carbohydrate with 4 carbons is called a:
A carbohydrate with 4 carbons is called a:
A) hexose
B) triose
C) pentose
D) tetrose
Neves   73   2 Replies
7 years ago
A carbohydrate with 5 carbons is called a:
A carbohydrate with 5 carbons is called a:
A carbohydrate with 5 carbons is called a:
A) hexose
B) triose
C) pentose
D) tetrose
Neves   69   2 Replies
7 years ago
A carbohydrate with 6 carbons and a ketone functional group is called a(n):
A carbohydrate with 6 carbons and a ketone functional group is called a(n):
A carbohydrate with 6 carbons and a ketone functional group is called a(n):
A) ketohexose
B) aldohexose
C) ketopentose
D) aldopentose
Neves   84   2 Replies
7 years ago
A carbohydrate with 6 carbons and an aldehyde functional group is called a(n):
A carbohydrate with 6 carbons and an aldehyde functional group is called a(n):
A carbohydrate with 6 carbons and an aldehyde functional group is called a(n):
A) ketohexose
B) aldohexose
C) ketopentose
D) aldopentose
Neves   239   2 Replies
7 years ago
A carbohydrate with a ketone functional group is called:
A carbohydrate with a ketone functional group is called:
A carbohydrate with a ketone functional group is called:
A) ketose
B) aldose
C) disaccharide
D) hexose
Neves   84   2 Replies
7 years ago
A carbohydrate with an aldehyde functional group is called:
A carbohydrate with an aldehyde functional group is called:
A carbohydrate with an aldehyde functional group is called:
A) ketose
B) aldose
C) disaccharide
D) hexose
Neves   81   2 Replies
7 years ago
A carbon atom that has single bond to four substituents with exactly two of the
A carbon atom that has single bond to four substituents with exactly two of the
A carbon atom that has single bond to four substituents with exactly two of the four substituents identical is called a ________.
A) prochiral carbon atom
B) tetrahedral stereocenter
C) divalent carbon atom
D) anomeric carbon a
mikael   2276   2 Replies
10 years ago
A carboxylic acid is formed by oxidation of an aldehyde.Pick whether it's true or false...
A carboxylic acid is formed by oxidation of an aldehyde.Pick whether it's true or false...
A carboxylic acid is formed by oxidation of an aldehyde.
Pick whether it's true or false...
Neves   111   2 Replies
7 years ago
A catalyst (Multiple Choice)
A catalyst (Multiple Choice)
A catalyst
 a. increases the rate of a chemical reaction
  b. increases the amount of product obtained in a chemical reaction
  c. decreases the amount of product obtained in a chemical reaction
  d. none of the choices
mdlc0516   63   1 Reply
6 years ago
A catalyst : (Multiple Choice)
A catalyst : (Multiple Choice)
A catalyst
 A) increases the rate of a chemical reaction
  B) increases the amount of product obtained in a chemical reaction
  C) decreases the amount of product obtained in a chemical reaction
  D) none of the choices
Jovaini   59   1 Reply
6 years ago
A catalyst increases the reaction rate by reducing the activation energy. Pick whether it's true or ...
A catalyst increases the reaction rate by reducing the activation energy. Pick whether it's true or ...
A catalyst increases the reaction rate by reducing the activation energy.
Pick whether it's true or false...
Neves   89   2 Replies
7 years ago
A catalyst increases the reaction rate by reducing the free energy change for the process.Is this ...
A catalyst increases the reaction rate by reducing the free energy change for the process.Is this ...
A catalyst increases the reaction rate by reducing the free energy change for the process.
Is this statement T or F?
Neves   118   2 Replies
7 years ago
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
 a. It increases the number of collisions between reacting molecules.
  b. It makes the reaction more endothermic.
  c. It makes the reaction more exother
lacoya15   48   2 Replies
6 years ago
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
 a. It increases the number of collisions between reacting molecules.
  b. It makes the reaction more endothermic.
  c. It makes the reaction more exother
Brooke.catlin   43   1 Reply
6 years ago
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
 a. It provides an alternate pathway with a lower activation energy.
  b. It increases the number of collisions between reacting molecules.
  c. It makes
mahi   54   1 Reply
6 years ago
A catalyst speeds up a reaction rate by ________.
A catalyst speeds up a reaction rate by ________.
A catalyst speeds up a reaction rate by ________.
Neves   99   2 Replies
7 years ago
A cataract is a clouding of the:
A cataract is a clouding of the:
A cataract is a clouding of the:
 A) cornea.
  B) iris.
  C) lens.
  D) conjunctiva.
Theleeman   56   1 Reply
6 years ago
A cell in an active metabolic state has
A cell in an active metabolic state has
A cell in an active metabolic state has
 a. a high (ATP/ADP) and a high (NADH/NAD+) ratio.
  b. a high (ATP/ADP) and a low (NADH/NAD+) ratio.
  c. a low (ATP/ADP) and a low (NADH/NAD+) ratio.
  d. a low (ATP/ADP) and a high (NADH
linasottile   37   1 Reply
6 years ago
A cell in an active metabolic state has :
A cell in an active metabolic state has :
A cell in an active metabolic state has
 A) a high (ATP/ADP) and a high (NADH/NAD+) ratio.
  B) a high (ATP/ADP) and a low (NADH/NAD+) ratio.
  C) a low (ATP/ADP) and a low (NADH/NAD+) ratio.
  D) a low (ATP/ADP) and a high (N
lovelyturret   39   1 Reply
6 years ago
A cell that has been fed glucose containing carbon — radioactive with carbon 14
A cell that has been fed glucose containing carbon — radioactive with carbon 14
A cell that has been fed glucose containing carbon — radioactive with carbon 14  in carbon #1 will have ________ percent of the radioactivity in each mole of glyceraldehyde-3-phosphate.
A) 0%
B) 25%
C) 50%
D) 100%
mikael   317   2 Replies
10 years ago
A cell that neither gains nor loses water when it is immersed in a solution is _
A cell that neither gains nor loses water when it is immersed in a solution is _
A cell that neither gains nor loses water when it is immersed in a solution is ______.
A) isotonic to its environment
B) hypertonic to its environment
C) hypotonic to its environment
D) metabolically inactive
mikael   1769   2 Replies
10 years ago
A certain automobile has an 18 gallon gas tank. What is the volume of this tank in liters? 1 gallon ...
A certain automobile has an 18 gallon gas tank. What is the volume of this tank in liters? 1 gallon ...
A certain automobile has an 18 gallon gas tank. What is the volume of this tank in liters? 1 gallon = 4 quarts, 1 quart = 0.946 liter
 a. 4.3 L c. 68 L
  b. 4.8 L d. 76 L
Greenspotsock   56   2 Replies
6 years ago
A certain quantity of neon gas is under 1.05 atm pressure at 303 K in a 10.0 L vessel. How many ...
A certain quantity of neon gas is under 1.05 atm pressure at 303 K in a 10.0 L vessel. How many ...
A certain quantity of neon gas is under 1.05 atm pressure at 303 K in a 10.0 L vessel. How many moles of neon are present?
 a. 0.222 mol c. 0.422 mol
  b. 0.402 mol d. 2.37 mol
kekebab001   47   1 Reply
6 years ago
A certain wine contains 0.0100 M NaHSO3 as a preservative. What mass of NaHSO3 is in a 750 mL bottle ...
A certain wine contains 0.0100 M NaHSO3 as a preservative. What mass of NaHSO3 is in a 750 mL bottle ...
A certain wine contains 0.0100 M NaHSO3 as a preservative. What mass of NaHSO3 is in a 750 mL bottle of this wine?
 a. 0.39 g c. 0.78 g
  b. 0.70 g d. 1.5 g
Pooh bear   39   1 Reply
6 years ago
A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is
A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is
A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is referred to as a ________ whereas if it becomes more negative it is referred to as ________.
A) polarization : depolarization
B) depola
SalwanJ   167   3 Replies
7 years ago
A channel that opens in response to binding a particular molecule is called a ________ channel. ...
A channel that opens in response to binding a particular molecule is called a ________ channel. ...
A channel that opens in response to binding a particular molecule is called a ________ channel.
A)   passive diffusion    D)   All of the above.
B)   symport    E)   None of the above.
C)   ligand-gated
jackamus   71   2 Replies
6 years ago
A characteristic feature of feedback inhibition is that
A characteristic feature of feedback inhibition is that
A characteristic feature of feedback inhibition is that
 a. it is wasteful of energy and reducing power in anabolic pathways
  b. it leads to buildup of the end products of anabolic pathways
  c. it seldom occurs in the metabolism of
sophie0209   57   2 Replies
6 years ago
A characteristic feature of feedback inhibition is that :
A characteristic feature of feedback inhibition is that :
A characteristic feature of feedback inhibition is that
 A) it is wasteful of energy and reducing power in anabolic pathways
  B) it leads to buildup of the end products of anabolic pathways
  C) it seldom occurs in the metabolism o
Angela26kristin   66   1 Reply
6 years ago
A characteristic feature of NMP kinases is a sequence of Gly-X-X-X-X-Gly-Lys that is referred to as ...
A characteristic feature of NMP kinases is a sequence of Gly-X-X-X-X-Gly-Lys that is referred to as ...
A characteristic feature of NMP kinases is a sequence of Gly-X-X-X-X-Gly-Lys that is referred to as the ______________________.
tulao68   48   1 Reply
6 years ago
A characteristic of sickle cell hemoglobin, Hb S, is that it:
A characteristic of sickle cell hemoglobin, Hb S, is that it:
A characteristic of sickle cell hemoglobin, Hb S, is that it:
 a. will not bind oxygen
  b. has abnormal heme groups
  c. contains only alpha globin chains
  d. tends to form aggregates when deoxygenated
  e. contains no hem
lovelyturret   41   1 Reply
6 years ago
A characteristic of sickle cell hemoglobin, Hb S, is that it:
A characteristic of sickle cell hemoglobin, Hb S, is that it:
A characteristic of sickle cell hemoglobin, Hb S, is that it:
 a. will not bind oxygen
 b. has abnormal heme groups
 c. contains only alpha globin chains
 d. tends to form aggregates when deoxygenated
 e. contains no heme gr
motee   46   1 Reply
6 years ago
A characteristic of the glycerol phosphate shuttle is
A characteristic of the glycerol phosphate shuttle is
A characteristic of the glycerol phosphate shuttle is
 a. it shuttles NADH across the mitochondrial membrane to yield 5 ATP/NADH
  b. it shuttles the electrons from NADH across the mitochondrial membrane to FADH2, yielding 5 ATP/NADH
linasottile   93   1 Reply
6 years ago
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