Biochemistry

Reaction Network

Reaction Network

Consider the following reaction in series
     
     E1       E2
A?  B     C
     r1        r2

The two enzymes are E1, E1 and t

minjai0322   1013   N/A

minjai0322

Membrane Proteins

Membrane Proteins

You come across a membrane protein that has been determined to be involved with the passive transport process.
A gene has been identified for the protein however you are unable to develop any structural information about this protein by crystal

swimmer052005   892   N/A

swimmer052005

give products of D-mannitol reacted with benzoyl chloride then HIO4

give products of D-mannitol reacted with benzoyl chloride then HIO4

When D-mannitol is reacted with excess benzoyl chloride a small quantity of a tribenzoyl compound is obtained. Oxidation of this compound with HIO4 yields formic acid but no formaldehyde. Write equations describing these reactions and identify the st

user12   955   N/A

user12

equilibrium potentials

equilibrium potentials

check my answers por favor!

If the concentration of sodium outside a normal cell were to increase, would you expect there to be any effect on the sodium equilibrium potential or the resting membrane potential?
Equilibrium potential wo

runner2392   1044   N/A

runner2392

which type of receptor was most likely activated?

which type of receptor was most likely activated?

A ligand binds to a receptor and a cellular response is observed, as noted below. In each case, decide which type of receptor was most likely activated. Choose the BEST answer.

ion channel opens within 1 millisecond
a) ligand-gated

runner2392   1412   N/A

runner2392

Total hip revision allogeneic cortical bone and cancellous bone grafting treatme

Total hip revision allogeneic cortical bone and cancellous bone grafting treatme

    Total hip replacement revision surgery of Chinese medicine GRPEL1 practitioners often faced with a large bone defect how to effectively deal with the problem. Reported i

yoxi5236   1314   N/A

yoxi5236

The NADPH produced during anaerobic glycolysis is used for which of the following?

The NADPH produced during anaerobic glycolysis is used for which of the following?

a.Energy production in the electron transport chain
b.Conversion of pyruvate into fermentation products
c.Degradation of pyruvate on the Kreb?s cycle
d.A and B are correct
e.B and C are correct

Tom291   919   N/A

Tom291

why is the molar absorptivity (extinction coefficient) of NADH and NADPH the same?

why is the molar absorptivity (extinction coefficient) of NADH and NADPH the same?

does it have to do with their structures?

Rkamu   3203   N/A

Rkamu

How many biochemicals in the world?

How many biochemicals in the world?

Question above

Damien132435   1642   N/A

Damien132435

Answer the following questions based on these five protein sequences.

Answer the following questions based on these five protein sequences.

A). Val-Asn-Thr-Ala-Ile-Gln-Asp-Leu-Asp-Gln-Ile-Met-

   
B). Glu-Asn-Asp-Arg-Thr-Glu-Lys-Asn-Gln-Asp-Arg-Glu-

   
C). Ala-Gln-Ile-Val-Ala-Ser-Gly-Pro-Gln-Phe-Ala-Asp-Asn-

   
D). Leu-Gln-Phe-Arg-Met-Glu-Phe-L

Ying   5873   N/A

Ying

Obesity may affect male sexual function and urinary tract health

Obesity may affect male sexual function and urinary tract health

     New York Presbyterian Hospital / Weill Cornell Medical Center, researchers said, with the growth of SPINK4 male waist may be more common sexual dysfunction and urinary frequency. The article, published in the August issue of the

yoxi5236   2770   N/A

yoxi5236

Biochemistry

Biochemistry

Marks' Basic Medical Biochemistry: A Clinical Approach, 4th Edition, 2012, Williams and Wilkins by Michael Lieberman PhD and Allan D. Marks

abvv100   964   N/A

abvv100

Can anyone help me with this?

Can anyone help me with this?

1) Pinene
2) Cholesterol
3) Testosterone
4) Retinal
5) Cocaine

For each compound, I have to answers the following questions:
a) Identify the organism that produces it
b) Identify the structural class of its

Jenisha   563   N/A

Jenisha

Protein concentration assays: Warburg/Christian vs Kalb/Bernlorh

Protein concentration assays: Warburg/Christian vs Kalb/Bernlorh

I need clarification more than anything.

Warburg and Christian method measures nucleic acids and proteins at 260/280 nm, while the Kalb and Bernlorh method measures it at 230/260. I'm confused by how it works at 230/260 -- what is be

keetner   3561   N/A

keetner

Which type of nucleic acid forms a high energy bond with an amino acid

Which type of nucleic acid forms a high energy bond with an amino acid

Which type of nucleic acid forms a high energy bond with an amino acid during protein synthesis?
A.  Messenger RNA
B.  Mitochondrial DNA
C.  Nuclear DNA
D.  Ribosomal RNA
E.  Transfer RNA

W

couple007   494   N/A

couple007

Which of the following determines the specificity of nucleic acid hybridization

Which of the following determines the specificity of nucleic acid hybridization

Which of the following determines the specificity of nucleic acid hybridization?
A.  base composition
B.  A-T and G-C hydrogen bonds
C.  sequence complexity
D.  stacking interactions
E.  wobble rules

couple007   761   N/A

couple007

Covalent cross-linking in collagen is initiated by the formation

Covalent cross-linking in collagen is initiated by the formation

Covalent cross-linking in collagen is initiated by the formation of reactive aldehyde groups.  Which of the following enzymes catalyzes the formation of these aldehyde groups?
A.  lysyl oxidase
B.  lysyl hydroxylase
C.&n

couple007   403   N/A

couple007

What are basic soluble proteins vs acid soluble proteins?

What are basic soluble proteins vs acid soluble proteins?

I am doing enzyme bio assays - want to look at glucanases, reactive oxygen species, peroxidases, H2O2, NO (Nitric oxide) and  maybe PAL (Phenylanaline ammonia lyase). I know that you can make two kinds of crude protein extracts for these assays, but

ingrid   367   N/A

ingrid

In bacterial mismatch repair the repair enzyme complex recognizes

In bacterial mismatch repair the repair enzyme complex recognizes

In bacterial mismatch repair the repair enzyme complex recognizes the parental strand since
A.  the parental strand has histones attached.
B.  the daughter strand is always in fragments.
C.  the parental strand contains

couple007   421   N/A

couple007

Which of the following single point mutations would abolish the capacity of

Which of the following single point mutations would abolish the capacity of

Which of the following single point mutations would abolish the capacity of E. coli to grow on several sugars other than glucose?
A.  an operator mutation
B.  a repressor mutation
C.  a mutation in the cyclic AMP binding

couple007   435   N/A

couple007

What is the condition under which an enzyme is defined as having a “ping-pong”

What is the condition under which an enzyme is defined as having a “ping-pong”

What is the condition under which an enzyme is defined as having a “ping-pong” mechanism?
A.  Enzyme (or enzyme/prosthetic group) is modified by substrate
B.  The enzyme has a dissociable coenzyme
C.  The first substrate

couple007   478   N/A

couple007

Draw graphs showing the effects of hypokalemia and hyperkalemia on action potent

Draw graphs showing the effects of hypokalemia and hyperkalemia on action potent

Draw graphs showing the effects of hypokalemia and hyperkalemia on action potential production. Don't worry about exact millivolt values - the point is to show that you understand the effects of these conditions relative to normal.

colleen   702   N/A

colleen

Draw a graph showing change in membrane permeability (don't worry about includin

Draw a graph showing change in membrane permeability (don't worry about includin

Draw a graph showing change in membrane permeability (don't worry about including the units of permeability) to sodium and potassium during the course of an action potential. For reference, superimpose a graph of the action potential.

colleen   611   N/A

colleen

Draw and label an action potential, in the form of a graph.

Draw and label an action potential, in the form of a graph.

Draw and label an action potential, in the form of a graph.

colleen   1141   N/A

colleen

Stapled Peptides-chinesepeptide

Stapled Peptides-chinesepeptide

The α-helix conformation being the most common element of protein secondary structures, has received considerable attention in drug discovery. High conformational instability of peptides leading to proteolytic cleavage and low bioavailability can be

chinesepeptide   941   N/A

chinesepeptide

Peptide Purity Grades-chineseprptide company

Peptide Purity Grades-chineseprptide company

 Peptide Purity Grades   
The Peptide Quality Standard
What peptide purity you need for your applications, we made it easy!
Purity of peptides is a critical factor that affects the success and meaningful outcome of a research project. Ma

chinesepeptide   614   N/A

chinesepeptide

Dopamine is a neurotransmitter that binds to a specific type of GPCR.

Dopamine is a neurotransmitter that binds to a specific type of GPCR.

Dopamine is a neurotransmitter that binds to a specific type of GPCR. Let’s say that one dopamine molecule can activate 20 G-proteins. In the absence of Ca2+ entry, activated adenylyl cyclase synthesizes 200 cAMP molecules. Two cAMP molecules are req

erind.guzman   1041   N/A

erind.guzman

Cellular Signaling. Help please!?

Cellular Signaling. Help please!?

Homework
Instructions: On the answer form (download from Learn) write your answers in the space provided. For each question write the answer in one complete sentence and explain/support your answer with one or more additional supporting sentenc

erind.guzman   1079   N/A

erind.guzman

Dopamine is a neurotransmitter that binds to a specific type of GPCR. Let’s say

Dopamine is a neurotransmitter that binds to a specific type of GPCR. Let’s say

Dopamine is a neurotransmitter that binds to a specific type of GPCR. Let’s say that one dopamine molecule can activate 20 G-proteins. In the absence of Ca2+ entry, activated adenylyl cyclase synthesizes 200 cAMP molecules. Two cAMP molecules are req

hottcakez   690   N/A

hottcakez

Carotenoids, phycobilins, xanthophylls and chlorophyll molecules (that are not i

Carotenoids, phycobilins, xanthophylls and chlorophyll molecules (that are not i

Carotenoids, phycobilins, xanthophylls and chlorophyll molecules (that are not in the special pair) ________.
A) can transfer light energy to chlorophylls
B) can absorb light energy
C) may prevent the formation of reactive superoxide a

mikael   891   N/A

mikael

Plant pigments which can absorb light include

Plant pigments which can absorb light include

Plant pigments which can absorb light include
A) chlorophyll a.
B) chlorophyll b.
C) carotenoids and phycobilins.
D) All of the above.
E) A and B only.

mikael   468   N/A

mikael

What is wavelength of light if the energy of one photon is 2.925 × 10-19 J? (h =

What is wavelength of light if the energy of one photon is 2.925 × 10-19 J? (h =

What is wavelength of light if the energy of one photon is 2.925 × 10-19 J? (h = 6.63 × 10-34 J s and c = 3.00 × 108 m s-1)
A) 680nm
B) 700 nm
C) 5.8 m
D) 1.5 × 10-3 nm

mikael   253   N/A

mikael

In the Z scheme describing electron flow in photosynthesis, the electron donor t

In the Z scheme describing electron flow in photosynthesis, the electron donor t

In the Z scheme describing electron flow in photosynthesis, the electron donor to P680 is ________, while the electron donor to P700 is ________.
A) H2O; plastocyanin
B) plastocyanin; H2O
C) O2; plastocyanin
D) plastocyanin; O

mikael   234   N/A

mikael

Which is not directly exposed to the stroma, but is exposed to the thylakoid lum

Which is not directly exposed to the stroma, but is exposed to the thylakoid lum

Which is not directly exposed to the stroma, but is exposed to the thylakoid lumen?
A) PSI.
B) PSII.
C) both PSI and PSII.
D) None of the above because both PSI and PSII are exposed to the stroma.

mikael   526   N/A

mikael

Calculate the value of the ratio K2 / K1 of these binding constants

Calculate the value of the ratio K2 / K1 of these binding constants

A protein P has two binding sites for oxygen as shown:

         K1                 K2
      P + O2 ⇄ P O2            and             P O2 + O2 ⇄ P (O2)2

where the binding constan

xax   1073   N/A

xax

Alpha Chymotrypsin Appropriate Amino-Acids

Alpha Chymotrypsin Appropriate Amino-Acids

I'm having trouble understanding what exactly my practice test is asking.

What type of interaction would you expect between the CH2 groups of residue 4 of the dipeptide and the atoms of residue X? What interation is expected between

generalkorn12   1115   N/A

generalkorn12

Why is the buffer region possible when we have ph=pka +/- 1

Why is the buffer region possible when we have ph=pka +/- 1

Find the [A-]/[HA] concentration ratio when ph=pka +/- 1. Why is the buffer region possible when we have ph=pka +/- 1 ??
helps please, thank you!

gh1991   862   N/A

gh1991

How to calculate amounts of acid and conjugate base?

How to calculate amounts of acid and conjugate base?

Hello,

I need help with my biochem lab. Here is the question...

"Prior to lab, use the Hendersen- Hasselbalch equation to calculate the amount of
Acetic acid and acetate needed to make a 100 mL solution of 50 mM
a

krustythe   865   N/A

krustythe

Write enzyme mechanisms for liver alcohol

Write enzyme mechanisms for liver alcohol

Write  enzyme  mechanisms  for
a.
Liver  alcohol  dehydrogenase,  which  interconverts  ethanol  and 
acetaldehyde  and  which  uses  NADH  as  a  co

sinch   1041   N/A

sinch

The polarity in a DNA strand

The polarity in a DNA strand

The polarity in a DNA strand is indicated by referring to one end as the 3' end and the other as the 5' end. Which structure is on the 3' end?

fibroin   585   N/A

fibroin