Biochemistry

folic acid deficiency q...

folic acid deficiency q...

Folic acid deficiency, believed to be the most common vitamin deficiency, causes a type of anemia in which haemoglobin synthesis is impaired and erythrocytes do not mature properly. Explain the metabolic relationship between haemoglobin synthesis and

qew   2857   2 Replies

qew

How many gene products are required to form this structure?

How many gene products are required to form this structure?

A cellular structure is composed of 20 proteins that have identical structures. How many gene products are required to form this structure?

Susan   1884   1 Reply

duddy

Amino Acid Polypeptide Q

Amino Acid Polypeptide Q

I need help on the review question:

How many molecules of water are used up in the breakdown of a polypeptide 15 amino acids in length?

B

barry   6070   1 Reply

bio_man

Amino acids phosphorylation

Amino acids phosphorylation

Which of the following amino acids could be a target for phosphorylation, and why?

The options are:

Phe, Tyr, Ala, Asp, Ser, Cys, Thr.

jonas   1445   1 Reply

bio_man

Matter, Isotopes and Buffers Homework Help

Matter, Isotopes and Buffers Homework Help

I have a small presentation I have to do for my biology class and the topics were chosen at random. The point of the presentation is to connect the topics together and explain how they relate. My problem is that I can't find a relationship betwe

dinosaur5   1794   3 Replies

bio_man

Functionality of carbohydrates

Functionality of carbohydrates

Hello fellow scientists!
This is my first topic here, and I look forward to enlarging my knowledge on this forum!

So, in school we talked about carbohydrates briefly. I know that they are grouped by the number of carbon atoms and so o

CLukic   2311   9 Replies

bio_man

Hemoglobin Oxygen Binding Curve Question

Hemoglobin Oxygen Binding Curve Question

From the link:

For the following questions, which would it be?

-from A to B
-B to A
-B to C
-C to B

1) the blood pH drops from 7.4 to 7.2
2) The blood CO2 concentration increases
3) THe conce

chels194   17521   10 Replies

chels194

Glycolysis

Glycolysis

So I have this homework assignment and was wondering if I could get some help.

How does oxygen consumption affect glucose metabolism of heart tissue. During an experiment, deoxygenated blood is passed through a heart and measures a consta

confused   2405   7 Replies

karim89

Keratin

Keratin

So I kinda need help w/ this..not really sure about it...

chels194   2343   9 Replies

chels194

DNA molecules present

DNA molecules present

2. A cell has 8 chromosome in G1 of interphase.
-Draw a picture of this cell with its chromosomes at the following stages (0.5 each).
-Indicate how many DNA molecules are present at each stage (0.5 each).

a. Metaphase of mitos

Babygal   1617   4 Replies

bio_man

How long would it take for saliva to get harmful bacteria in it?

How long would it take for saliva to get harmful bacteria in it?

I asked this on yahoo answers and it was suggested that I re-ask here. It was a bit of a hassle to register and everything for one question, but I'm still curious. xP

I've been wondering about this for a while now and saliva is s

Ryn1001   2554   7 Replies

Ryn1001

functional groups

functional groups

In the following table, indicate whether each functional group is polar or nonpolar and hydrophobic or hydrophilic. Which of these functional groups are found in proteins and lipids?

Functional Group

OH

- CH2

levik24   19250   1 Reply

bio_man

You are working in a research lab investigating lignin degradation by the bacterium Eatusdetree ...

You are working in a research lab investigating lignin degradation by the bacterium Eatusdetree ...

You are working in a research lab investigating lignin degradation by the bacterium Eatusdetree totalii which was isolated from a rotting piece of birch your supervisor found while strolling in the forest. The genomic sequence of this bacterium has n

star   1257   1 Reply

bio_man

Interferon tau

Interferon tau

Is it feasible/possible to measure the interferon tau (NOT the ISG) in blood sample of inseminated cows ?
I was searching the for " determination of interferon tau". But all searched results show "interferon tau stimulated genes&q

gautam   1530   2 Replies

bio_man

discuess the process of DNA molecules base-pairing in thermodynamic terms

discuess the process of DNA molecules base-pairing in thermodynamic terms

If two single-stranded DNA molecules with complementary sequences are mixed
in solution under physiological conditions (as found in a cell), they will base-pair
to form a doubled-stranded molecule. Briefly discuss this process in thermodyna

roxana90   1305   2 Replies

karim89

Emergent properties/versatility of carbon?

Emergent properties/versatility of carbon?

Emergent properties versatility of carbon? doing a review sheet  and need as much detail as possible. aslso try to connect the emergent properties with something else in life.

Morbesety   5840   3 Replies

bio_man

Km and Vmax

Km and Vmax

1) For Kinetic experiments performed with increasing cocentrations of an noncompetitive inhibitor, which of the following would be observed?
What Km and Vmax do? decrease or increase

2) Based upon the definition for a competitive inhi

chels194   4271   2 Replies

karim89

Diffrence between allosteric inhibitor & feedback inhibition?

Diffrence between allosteric inhibitor & feedback inhibition?

what is the difference between allosteric inhibitor & feedback inhibition?...

Morbesety   9854   1 Reply

bio_man

A ribbon representation of a protein domain

A ribbon representation of a protein domain

Shown below is a ribbon representation of a protein domain. Name the recognizable secondary structures a, b, (c & d). Are c and d parallel or antiparallel?

minjai0322   1087   1 Reply

bio_man

membrane transport

membrane transport

1) Arrange the following in order of the greatest to least contribution to the ability of fatty acids to pack together.

 
 1. Short unsaturated tail
 2. Short saturated tail
 3. Long unsaturated tail
 4. Long saturated

chels194   1039   1 Reply

bio_man

Idenfifying the unit of polypeptide linked to a tRNA

Idenfifying the unit of polypeptide linked to a tRNA

A segment of a polypeptide linked to a tRNA is shown below. Identify the N-terminus, the C-terminus, the amino acid units (which key atoms belong to the same amino acid), the peptide bond and the side chains. Where can this peptide tRNA complex be fo

minjai0322   1236   3 Replies

bio_man

What do cyanophages do to dead photosynthetic organisms?

What do cyanophages do to dead photosynthetic organisms?

What do cyanophages do to dead photosynthetic organisms? How do they do it? Why are they called 'cyanophages'?

short and sweet please 

Morbesety   1053   1 Reply

bio_man

two-dimensional gel electrophoresis

two-dimensional gel electrophoresis

There are two proteins; one has a molecular weight of 10,000 Dalton and a pI of 7.1. The other has MW of 40,000 Da and pI of 4.9. They are separated by two-dimensional gel electrophoresis. The first dimension is PAGE. The second dimension is on a pH

minjai0322   1873   5 Replies

bio_man

microfilaments

microfilaments

which of the following are true about microfilaments?

1. polymerization of actin generally occurs more slowly at the (-) end of the actin polymer.
2. microfilaments are larger in diameter than intermediate filaments.
3. microfila

nickname   5611   5 Replies

karim89

What are intercellular junctions and why are they important?

What are intercellular junctions and why are they important?

What are intercellular junctions and why are they important? also

Contrast plasmodesmata, tight junctions, desmosomes, and gap junctions.

thanks!~

Morbesety   14603   1 Reply

bio_man

True or False questions for Enzyme kinetics

True or False questions for Enzyme kinetics

True or False: Cells in most tissues have only hexokinase for energy metabolism. Liver cells also have glucokinase that is used for taking up glucose for glycogen synthesis. Hexokinase has a higher Km for glucose than glucokinase.


Tr

minjai0322   2748   3 Replies

lewis

Linweaver-Burke plot / Enzyme catalysis

Linweaver-Burke plot / Enzyme catalysis

In the presence of a competitive inhibitor, the intercept of the Linweaver-Burke plot on y axis (1/r)
(a) increases
(b) decreases
(c) stays the same
(d) none of the above


Which of the following is not an advantage

minjai0322   1344   2 Replies

lewis

catalysis

catalysis

Does the following applied to acid-base , covalent , or metal ion catalysis or all of them?

-may use amino acids such a aspartate or lysine
-lowers the energy or stabilizes the transition state or intermediate.
-may take part in

chels194   3813   5 Replies

star

Multiple enzyme reactions

Multiple enzyme reactions

Many compounds are used in multiple enzyme reactions in the cell as a co-substrate. For example ATP and NADH. In a way those enzymes which need those substrates are competing for the shared substrate. Explain how cells may have developed a strategy t

minjai0322   1160   1 Reply

bio_man

facilitated diffusion, active transport

facilitated diffusion, active transport

So I need help with this...

chels194   1547   4 Replies

bio_man

Chemical Structure

Chemical Structure

/

jake52   1290   3 Replies

Biology Forums

Indicate whether each of the compounds in the stomach would be in protonated form or as a neutral ba

Indicate whether each of the compounds in the stomach would be in protonated form or as a neutral ba

Technically, this is just chemistry and not biochemistry but I'm hoping someone can help me!

Many moderately large organic molecules containing basic nitrogen atoms are not very soluble in water as neutral molecules, but they are freq

Polymorphism   5118   7 Replies

karim89

Multiple choice question for glycolysis

Multiple choice question for glycolysis

In glycolysis, each glucose molecule produces how many molecules of pyruvate?
(a) 0
(b) 1
(c) 2
(d) 3
(e) none of the above


The energy from glycolysis is preserved as (mark all that are correct)
(a) ATP

minjai0322   5129   1 Reply

bio_man

Glycolysis in a cell extract

Glycolysis in a cell extract

Glycolysis can be carried out not only in the cell, but can also in a cell extract. In that case, all
enzymes in glycolysis are extracted from a cell to allow the reaction to proceed thus
converting glucose to pyruvate. One such reaction sy

minjai0322   2550   4 Replies

sarah!

In one tracer experiment glucose is labeled with C13 at its C1 [the carbon one, (which carbon

In one tracer experiment glucose is labeled with C13 at its C1 [the carbon one, (which carbon

In one tracer experiment glucose is labeled with C13 at its C1 [the carbon one, (which carbon
C1?)]. The glucose is used to feed yeast Saccharomyces cerevisiae that ferments it into
ethanol. Assuming all glucose fed becomes fermented to eth

minjai0322   991   1 Reply

bio_man

Listed below are the redox potential of “half reactions” of some reactions involved in electron ...

Listed below are the redox potential of “half reactions” of some reactions involved in electron ...

Listed below are the redox potential of “half reactions” of some reactions involved in electron transfer. Rank them according to the sequence of their position in transferring electrons from a high energetic state to a lower one.

Half reac

minjai0322   1525   1 Reply

bio_man

List two of the cofactors involved in the reaction catalyzed by pyruvate dehydrogenase. What is a ...

List two of the cofactors involved in the reaction catalyzed by pyruvate dehydrogenase. What is a ...

1. List two of the cofactors involved in the reaction catalyzed by pyruvate dehydrogenase. What is a cofactor of an enzyme?

2. The three reactions at the junction o fTCA cycle and glycolysis are shown below:
(a)      &n

minjai0322   1764   2 Replies

minjai0322

Oxidative Phosphorylation

Oxidative Phosphorylation

When dinitrophenol (DNP) is added to mitochondria, the inner membrane becomes permeable to protons.
(a) How will the electrochemical proton gradient change in response to DNP?
(b) DNP was one described as a weight loss drug. How would it pr

minjai0322   1195   1 Reply

bio_man

TCA cycle

TCA cycle

List two of the cofactors involved in the reaction catalyzed by pyruvate dehydrogenase. What is a cofactor of an enzyme?

minjai0322   791   1 Reply

bio_man

alpha helices and beta sheets

alpha helices and beta sheets

the amino acid with a distinct locked structure which interrupts alpha helices and beta sheets is called....................?

saab   3069   1 Reply

bio_man