Biochemistry

The mechanism of membrane transport may involve the following:

The mechanism of membrane transport may involve the following:

The mechanism of membrane transport may involve the following:
 A) ATP hydrolysis.
  B) Conformation change of membrane proteins.
  C) Phosphorylation or dephosphorylation of membrane proteins.
  D) ATP hydrolysis and conforma

Linalovespickle   41   1 Reply

Keeze

Transport of a compound across a cell membrane (down a concentration gradient) was measured at ...

Transport of a compound across a cell membrane (down a concentration gradient) was measured at ...

Transport of a compound across a cell membrane (down a concentration gradient) was measured at several concentrations. The presence or absence of ATP had no effect on the transport of this compound. Which best describes the mechanism of transport? Co

jayfro   50   1 Reply

gracieelaine12

The difference between active transport and passive transport is that :

The difference between active transport and passive transport is that :

The difference between active transport and passive transport is that
 A) concentration gradients are involved in one and not in the other.
  B) glycolipids play a role in one and not in the other.
  C) one requires expenditure of e

Jnortontruvisio   73   1 Reply

lhess431

Facilitated diffusion requires : (Multiple Choice)

Facilitated diffusion requires : (Multiple Choice)

Facilitated diffusion requires
 A) a channel protein through which the transported substance passes without binding
  B) a carrier protein to which the transported substance binds
  C) a receptor protein
  D) expenditure of en

nclariceb   86   2 Replies

nclariceb

Which of the following is not true?

Which of the following is not true?

Which of the following is not true?
 A) Receptors are often invaginated into the cell after binding to their specific molecule.
  B) A given receptor type is present at a constant level on the outside of a cell
  C) In certain disea

tarapratt95   31   1 Reply

PrincessAwesome

In the operation of the sodium-potassium pump :

In the operation of the sodium-potassium pump :

In the operation of the sodium-potassium pump
 A) conformational changes in membrane proteins are inhibited
  B) the ions involved bind to the lipid portion of the membrane
  C) a membrane protein is phosphorylated with ATP as the s

Brooke.catlin   31   1 Reply

shonsber

What distinguishes primary from secondary active transport?

What distinguishes primary from secondary active transport?

What distinguishes primary from secondary active transport?
 A) The requirement for protein.
  B) The type of linkage to ATP hydrolysis
  C) The number of kinds of molecules or ions transported
  D) The relative direction of t

Jovaini   31   1 Reply

neontoast91

Which of the following methods of transport across a membrane does not require a protein?

Which of the following methods of transport across a membrane does not require a protein?

Which of the following methods of transport across a membrane does not require a protein?
 A) Passive transport
  B) Facilitated transport
  C) Active Transport
  D) Simple diffusion
  E) they all require a protein

omrglss   41   1 Reply

mickeymouse1

Which of the following statements concerning active transport is true?

Which of the following statements concerning active transport is true?

Which of the following statements concerning active transport is true?
 A) It takes place in the same direction as a concentration gradient.
  B) It requires no expenditure of energy by the cell.
  C) It can be compared to water run

Jovaini   46   1 Reply

Lettyyys

A major difficulty in extracting receptor proteins from membranes is that :

A major difficulty in extracting receptor proteins from membranes is that :

A major difficulty in extracting receptor proteins from membranes is that
 A) it is difficult to remove the proteins from the membrane without denaturation
  B) there may be very few molecules of the protein in a cell
  C) receptor

alexiswells   25   2 Replies

alexiswells

In the sodium-potassium pump : (Multiple Choice)

In the sodium-potassium pump : (Multiple Choice)

In the sodium-potassium pump
 A) sodium is transported out of the cell and potassium into the cell, both against concentration gradients
  B) sodium is transported into the cell and potassium out of the cell, both against concentration gr

bdiddydog   77   1 Reply

Godzilla159

A useful method for studying membrane proteins in place in the membrane is :

A useful method for studying membrane proteins in place in the membrane is :

A useful method for studying membrane proteins in place in the membrane is
 A) nuclear magnetic resonance
  B) x-ray crystallography
  C) treatment with mercaptoethanol
  D) treatment with detergents

hiufwsiuefbwe   51   1 Reply

poot10

Glycoproteins on the cell surface are involved in this type of function:

Glycoproteins on the cell surface are involved in this type of function:

Glycoproteins on the cell surface are involved in this type of function:
 A) Cell identification
  B) Receptor sites
  C) Immune function
  D) Cell identification and receptor sites
  E) All of these are correct.

Jnortontruvisio   63   1 Reply

physico

The key reaction of eyesight (in dim light) involving vitamin A is:

The key reaction of eyesight (in dim light) involving vitamin A is:

The key reaction of eyesight (in dim light) involving vitamin A is:
 A) Reaction of the protein complex called Rhodopsin.
  B) A cis-trans isomerization of a double bond.
  C) Bleaching of a pigment in the retina.
  D) Reactio

Abessesen   199   1 Reply

DR.BREEEEEE

These two lipid vitamins are often found in membranes:

These two lipid vitamins are often found in membranes:

These two lipid vitamins are often found in membranes:
 A) A and D
  B) A and E
  C) D and E
  D) E and K
  E) None of these is the correct pair.

kekebab001   25   1 Reply

Godzilla159

The following lipid vitamin is often used to preserve foods from spoiling:

The following lipid vitamin is often used to preserve foods from spoiling:

The following lipid vitamin is often used to preserve foods from spoiling:
 A) A
  B) D
  C) E
  D) K
  E) None of these preserves food.

lacinb30   44   2 Replies

lacinb30

Vitamin E has all of the following properties, except:

Vitamin E has all of the following properties, except:

Vitamin E has all of the following properties, except:
 A) It is an antioxidant.
  B) It can be made in the sunshine.
  C) It is essential for at least some mammal's fertility.
  D) It is often a component of membranes.

tarapratt95   42   1 Reply

hurricanechris7

The vitamin needed for blood coagulation is :

The vitamin needed for blood coagulation is :

The vitamin needed for blood coagulation is
 A) vitamin A
  B) vitamin D
  C) vitamin E
  D) vitamin K

MB0727   89   1 Reply

kburke

The vitamin classified as fat soluble rather than water soluble is :

The vitamin classified as fat soluble rather than water soluble is :

The vitamin classified as fat soluble rather than water soluble is
 A) vitamin A
  B) vitamin B1
  C) vitamin B6
  D) vitamin C

alshernandez   47   1 Reply

Keeze

There are likely to be huge stores of lipid vitamins in healthy animals. :

There are likely to be huge stores of lipid vitamins in healthy animals. :

There are likely to be huge stores of lipid vitamins in healthy animals.
 A) True
  B) False

Jnortontruvisio   38   1 Reply

gracieelaine12

Which of the following is not a lipid-soluble vitamin?

Which of the following is not a lipid-soluble vitamin?

Which of the following is not a lipid-soluble vitamin?
 A) Ascorbic Acid
  B) Cholicalciferol
  C) Vitamin K
  D) Retinol
  E) Tocopherol

stalmoney   54   2 Replies

stalmoney

The following lipid vitamin has important involvement with calcium ions:

The following lipid vitamin has important involvement with calcium ions:

The following lipid vitamin has important involvement with calcium ions:
 A) A
  B) D
  C) E
  D) K
  E) More than one reacts with calcium ion.

alshernandez   20   1 Reply

DR.BREEEEEE

Which of the following is a metabolic precursor of prostaglandins & leukotrienes?

Which of the following is a metabolic precursor of prostaglandins & leukotrienes?

Which of the following is a metabolic precursor of prostaglandins & leukotrienes?
 A) vitamin A.
  B) arachidonic acid.
  C) sphingomyelin.
  D) cholesterol.

Miller123   42   1 Reply

DR.BREEEEEE

Aspirin produces most of its analgesic effects by :

Aspirin produces most of its analgesic effects by :

Aspirin produces most of its analgesic effects by
 A) binding to the plasma membrane of nerve cells
  B) inhibiting the synthesis of vitamin A
  C) inhibiting the synthesis of phospholipids
  D) inhibiting the synthesis of pro

Greenspotsock   38   1 Reply

freddieg23

Which of the following does not belong in the list?

Which of the following does not belong in the list?

Which of the following does not belong in the list?
 A) Retinol
  B) Vitamin A
  C) beta-carotene
  D) Cholesterol

sophie0209   64   1 Reply

pripaw

Explain how the overall shape of fatty acids is affected by cis and trans double bonds.

Explain how the overall shape of fatty acids is affected by cis and trans double bonds.

Explain how the overall shape of fatty acids is affected by cis and trans double bonds.

ugai_kyut   43   1 Reply

canelo

When an organism uses fatty acids, the ester linkages of triacylglycerols are hydrolyzed by enzymes ...

When an organism uses fatty acids, the ester linkages of triacylglycerols are hydrolyzed by enzymes ...

When an organism uses fatty acids, the ester linkages of triacylglycerols are hydrolyzed by enzymes called _____.
 A) transferases
  B) lipases
  C) ligases
  D) isomerases

jayfro   51   2 Replies

jayfro

Which of the following lipids is an example of glycolipids?

Which of the following lipids is an example of glycolipids?

Which of the following lipids is an example of glycolipids?
 A) Oleomargarine
  B) Progesterone
  C) Cholesterol
  D) Gangliosides

kristina92293   21   1 Reply

winger785

Explain the significance of prostaglandins.

Explain the significance of prostaglandins.

Explain the significance of prostaglandins.

ahh_risa   34   1 Reply

jana_akkari

The nucleotide sequence of DNA is which level of structure?

The nucleotide sequence of DNA is which level of structure?

The nucleotide sequence of DNA is which level of structure?
 A) primary
  B) secondary
  C) tertiary
  D) quaternary

stalmoney   67   1 Reply

P.liania

Quaternary structure refers to the non-covalent interaction(s) between polymeric units, such as two ...

Quaternary structure refers to the non-covalent interaction(s) between polymeric units, such as two ...

Quaternary structure refers to the non-covalent interaction(s) between polymeric units, such as two or more monomer protein units that noncovalently interact. Which of the following scenarios for nucleic acids most closely resembles quaternary struct

sarah_verduzco1   38   1 Reply

jianhong9991

The double helix of DNA is which level of structure?

The double helix of DNA is which level of structure?

The double helix of DNA is which level of structure?
 A) primary
  B) secondary
  C) tertiary
  D) quaternary
  E) None of these

sophie0209   48   1 Reply

sophiamendoza94

What distinguishes nucleotides from nucleosides?

What distinguishes nucleotides from nucleosides?

What distinguishes nucleotides from nucleosides?
 A) Nucleosides lack the phosphate group.
  B) Nucleosides lack the sugar group.
  C) Nucleosides lack a nitrogenous base.
  D) The two words are synonymous

bubblegum123   61   2 Replies

bubblegum123

Which of the following is the most distinguishing difference between a purine and a pyrymidine :

Which of the following is the most distinguishing difference between a purine and a pyrymidine :

Which of the following is the most distinguishing difference between a purine and a pyrymidine
 A) purines are found in DNA while pyrimidines are found in RNA
  B) purines have nitrogens in the rings while pyrimidines do not
  C) py

omrglss   29   1 Reply

mrperretti

Which of the following is the most common modification of nucleic acid bases?

Which of the following is the most common modification of nucleic acid bases?

Which of the following is the most common modification of nucleic acid bases?
 A) addition of a methyl group
  B) addition of a carboxylic acid
  C) addition of a fluorine
  D) reduction of a carbonyl to an alcohol

hawkins1346   32   1 Reply

Mulatta

Deoxyadenylate (dA) is a: (Multiple Choice)

Deoxyadenylate (dA) is a: (Multiple Choice)

Deoxyadenylate (dA) is a:
 A) purine base
  B) pyrimidine base
  C) purine based nucleoside
  D) purine based nucleotide
  E) pyrimidine based nucleotide

kekebab001   65   1 Reply

Nrcp1978

Which of the following bases is not found in RNA?

Which of the following bases is not found in RNA?

Which of the following bases is not found in RNA?
 A) A
  B) C
  C) G
  D) T
  E) All of these are found in RNA.

omrglss   27   1 Reply

ksullivan042197

Which of the following nucleobases is a purine?

Which of the following nucleobases is a purine?

Which of the following nucleobases is a purine?
 A) adenine
  B) cytosine
  C) thymine
  D) uracil

hiufwsiuefbwe   41   1 Reply

jianhong9991

Deoxythymidylate (dT) is a: (Multiple Choice)

Deoxythymidylate (dT) is a: (Multiple Choice)

Deoxythymidylate (dT) is a:
 A) purine base
  B) pyrimidine base
  C) pyrimidine based nucleotide
  D) purine based nucleotide
  E) nucleoside

Brooke.catlin   74   2 Replies

Brooke.catlin

The fundamental differences between RNA and DNA are :

The fundamental differences between RNA and DNA are :

The fundamental differences between RNA and DNA are
 A) the organic bases only
  B) bases, ribose units, and the phosphodiester linkage
  C) bases, ribose units, and the glycosidic bond type
  D) bases and the ribose units onl

shoppa   61   1 Reply

bunique227744