Biochemistry

Chemical Structure of Zinc

Chemical Structure of Zinc

What is the chemical structure of Zinc? Because I found this picture on Google Images
[url=http://www.google.ca/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/0/0b/L-Fucose_pyranose_chemical_structure.png&imgrefurl=http://www.m

Nurse   1884   1 Reply

bio_man

BALANCINGGG :(

BALANCINGGG :(

Can someone please explain to me how to balance this equation, like how do you know how to do it

the equation C6H14 + O2= CO2 + H2O

please and thanks

gh1991   565   1 Reply

duddy

protein fragment

protein fragment

I cleave a protein with Cyanogen Bromide and get 2 fragments, A and B.  Sequencing of fragment B reveals that it ends (C-terminal) in homoserine lactone.  Which end of the protein does this fragment represent?

not sure how to app

linda   858   1 Reply

lewis

UV damge repair

UV damge repair

You have been out sunbathing and experience UV damage to the DNA in your skin cells.
a) What type of damage that might occur to you DNA due to the prolonged UV exposure?

b) Describe a cellular mechanism capable of repairing this damag

packersfan   887   1 Reply

bio_man

Explain what effect methylation of Lys and Arg will have on the nature of these two amino acids?

Explain what effect methylation of Lys and Arg will have on the nature of these two amino acids?

A common histone post-translational modification is methylation of Lys and Arg residues.
a) Explain what effect methylation of Lys and Arg will have on the nature of these two amino acids?

b) How does the change in chemistry from meth

packersfan   1116   1 Reply

bio_man

As the concentration of the HCL solution decreases, the conductance...

As the concentration of the HCL solution decreases, the conductance...

As the concentration of the HCL solution decreASES, The conductance _______(decrease or increase) because _____________________________ ___. Mixtures of metals also called alloys are conductors because______?

please & thanks )

gh1991   3227   1 Reply

bio_man

Crop Science Innovation Jam

Crop Science Innovation Jam

Hi,

We are running a one week collaborative "Idea Jam" for geneticists,
biologists, chemists, biochemists, plant scientists, and other
experts, to help develop the topic of Crop Yield, with a goal of
helping wor

datageekgh   776   1 Reply

bio_man

Electron transport Chain - Complex 2

Electron transport Chain - Complex 2

I am going through the electron transport chain and am not really finding much in my book or lecture about what Complex II roll in the Chain.  I know it turns succinate into fumarate,  Inturn turning FAD into FAD+ and producing QH2[/su

element41skater   1685   1 Reply

bio_man

Hemoglobin

Hemoglobin

Attached is a binding curve plot of oxygen binding by whole human blood.

1) What percent of bound O2 is delivered to the tissues?
2) Assume pH=7.4 in the lungs and 6.8 in the tissues per the figure,   0 (oxygen symbol) at 30mm Hg

shelby88   6669   1 Reply

duddy

Lineweaver-Burke plot-how to determine....

Lineweaver-Burke plot-how to determine....

A) What is Km for the uninhibited enzyme?
B) What is kcat for the uninhibited enzyme? enzyme concentration used for the experiment was 1nM.
C) Is the viral enzyme a very efficient catalyst? Why or why not? so I'm guess to tell this

shelby88   1805   1 Reply

duddy

Nucleic acids, molecular form

Nucleic acids, molecular form

You have also isolated and determined the sequence of two small pieces of nucleic acid from the baby tiger:
 
5’-GCCAUCUAGAUACGUG-3’
3’-CGGUAGAUCUAUGCAC-5’

5’-AUCAUCUAAAUACGUG-3’
3’-UAGUAGAUUUAUGCAC-5’

Which

linda   900   1 Reply

bio_man

enzyme

enzyme

can someone explain to me the relationship between enzyme activity and rate of reaction?

iki08   737   1 Reply

bio_man

Basic NaOH

Basic NaOH

a) why is it important to keep the NaOH solution covered at all times?
b) how will the molarity of the NaOH solution be affected by its continued exposure to the atmosphere?
c) the pale pink color of the titration solution at the end point

gh1991   3950   1 Reply

duddy

two critical regions of a tRNA molecule which allow translation

two critical regions of a tRNA molecule which allow translation

What are two critical regions of a tRNA molecule which allow it to participate in translation?

element41skater   4885   1 Reply

sarah!

In vitro translation: what is missing in this example?

In vitro translation: what is missing in this example?

A graduate student wants to do in vitro translation of a prokaryotic message and adds purified prokaryote small and large ribosomal subunits, f-met-tRNAf-met and all 20 charged tRNAs, a template mRNA with a known start codon and GTP to a flask in an

element41skater   700   1 Reply

sarah!

another electrochem problem

another electrochem problem

What is delta G knot for this reaction? How do you differentiate which is a cathode and which is an anode? Which is which for the following?


GSSG + NADPH + H+ ? 2GSH + NADP+
 
 
GSSG + 2e- + 2H+ ? 2GSH    &nb

emily   636   1 Reply

wouldbe

Krebs cycle

Krebs cycle

Does anybody where I can find a good drawing of the Krebs Cycle with its structures, products, cofactors, and enzymes?

emily   1353   1 Reply

bio_man

equilibrium constant

equilibrium constant

Zombie cerebral corticase lowers the activation energy for the rxn:
cadaverine+putrescine<-> zombine
from +40 to +10kJ/mol. what is the change in the equilibrium constant?

emily   909   1 Reply

supermario

Help please! urgent more chemistry then bio but :)

Help please! urgent more chemistry then bio but :)

What effect would each of the following have on the calculated molecular weight of an unknown? would the calculated value be higher than the true value? lower? same? explain.

1) some of the unknown fails to dissolve

2) the therm

gh1991   886   1 Reply

chemb

What is a permissive hormone effect?

What is a permissive hormone effect?

What is a permissive hormone effect? Provide an example, explaining what would result if the permissive hormone was absent.

ppk   17252   1 Reply

bio_man

Explain how cortisol suppresses the immune system

Explain how cortisol suppresses the immune system

Explain how cortisol suppresses the immune system, and why this is sometimes a useful therapy. What are some negative side effects of cortisol therapy? Why do doctors prescribe cortisol in doses that taper off at the end of the therapy period? Why do

ppk   3817   1 Reply

bio_man

What are the three common causes of hypercortisolism?

What are the three common causes of hypercortisolism?

What are the three common causes of hypercortisolism?

ppk   1533   1 Reply

bio_man

Which hormones are involved, and what effects do they have?

Which hormones are involved, and what effects do they have?

Billy has been serving in a noncombat position in the army for two years and has just been informed that he is leaving on a combat mission tomorrow. Billy is feeling very stressed. How has his endocrine system responded to this bad news? Which hormon

ppk   1379   1 Reply

bio_man

List and explain the effects of cortisol.

List and explain the effects of cortisol.

List and explain the effects of cortisol.

ppk   1442   1 Reply

bio_man

Which hormones of growth and metabolism have a permissive effect...

Which hormones of growth and metabolism have a permissive effect...

Which hormones of growth and metabolism have a permissive effect on other hormones of growth and metabolism?

ppk   1433   1 Reply

bio_man

Consider effects of normal amounts, as well as hyper- and hyposecretion.

Consider effects of normal amounts, as well as hyper- and hyposecretion.

Describe differences in effects of hormones of growth and metabolism in children compared to effects in adults. Consider effects of normal amounts, as well as hyper- and hyposecretion.

ppk   946   1 Reply

bio_man

Describe the hypothalamic-pituitary-endocrine organ pathways for the adrenal cortex and thyroid ...

Describe the hypothalamic-pituitary-endocrine organ pathways for the adrenal cortex and thyroid ...

Describe the hypothalamic-pituitary-endocrine organ pathways for the adrenal cortex and thyroid gland. Do releasing and/or trophic hormones exert effects outside this pathway? Explain.

ppk   2630   1 Reply

bio_man

Describe the endocrine regulation of bone growth.

Describe the endocrine regulation of bone growth.

Describe the endocrine regulation of bone growth.

ppk   1105   1 Reply

bio_man

Increasing height with testosterone or other androgens

Increasing height with testosterone or other androgens

Juan has great hopes that his 12-year-old son will play professional basketball and wants to do anything that might be helpful. He has heard that the administration of testosterone or other androgens might increase his son's height. Alarmed, you

ppk   747   1 Reply

bio_man

Therapeutic uses for cortisol

Therapeutic uses for cortisol

In an effort to impress her physiology instructor, your roommate did an Internet search on cortisol. In her exuberance, she failed to read the book chapter, the instructor has not yet lectured on this chapter, and frankly she knows next to nothing ab

ppk   1955   1 Reply

bio_man

Carl is suffering from hypothyroidism.

Carl is suffering from hypothyroidism.

Carl is suffering from hypothyroidism. How could his physician determine if his symptoms result from problems at the level of the hypothalamus and pituitary or at the level of the gland itself?

ppk   2857   1 Reply

bio_man

Ca2+ ions muscle contraction and neuron function

Ca2+ ions muscle contraction and neuron function

Rani has read how important Ca2+ ions are to muscle contraction and neuron function. Rani, age 25, hates milk and most dairy products, and doesn't think she eats many foods that are sources of calcium, nor does she take supplements. Why don'

ppk   1874   1 Reply

bio_man

Therapeutic surgical removal of the thyroid gland

Therapeutic surgical removal of the thyroid gland

Therapeutic surgical removal of the thyroid gland was documented more than 1000 years ago. In the 19th century, a surgeon performing that procedure had only about 50% patient survival, and patient death was often unrelated to nonspecific complication

ppk   1113   1 Reply

bio_man

Precocious puberty in girls can result from hypersecretion

Precocious puberty in girls can result from hypersecretion

Precocious puberty in girls can result from hypersecretion of nongonadal steroids. In such girls, there is early breast development, onset of menses, and ovulation of viable eggs. This can occur by age 7 or even earlier. Which hormone(s) and nongonad

ppk   1016   1 Reply

bio_man

edema and poor blood flow into the pituitary

edema and poor blood flow into the pituitary

Carmen has just given birth to her third child, and as with the first two, she stayed home and used the services of a nurse-midwife. While her recovery from the births of the first two children was normal and she was able to breast feed both for two

ppk   1011   1 Reply

bio_man

List the hormones of growth and metabolism

List the hormones of growth and metabolism

The approach to treating patients who secrete abnormal amounts of hormone sometimes depends upon the age of the patient. List the hormones of growth and metabolism for which this statement is true, and explain in each case how and why the approach wo

ppk   1049   1 Reply

bio_man

incomplete manifestation of puberty

incomplete manifestation of puberty

An adult with cretinism has incomplete manifestation of puberty (e.g., scant pubic hair), abnormal facial features, dwarfism, and mental retardation. Explain what causes these symptoms. How is cretin dwarfism different from pituitary dwarfism? How co

ppk   1623   1 Reply

bio_man

Which hormone or hormones may now be deficient?

Which hormone or hormones may now be deficient?

A diagnosis of thyroid cancer may be treated with removal of the thyroid gland. Which hormone or hormones may now be deficient? Considering each hormone individually, which ones should be restored and why? Explain any age-related considerations. Whic

ppk   1105   1 Reply

sarah!

Explain the polar character of an ammonia molecule (NH3)

Explain the polar character of an ammonia molecule (NH3)

Explain the polar character of an ammonia molecule (NH3). What is the cause of the partial charges? What is the overall charge for NH3?

ppk   3399   1 Reply

star

If the dissociation constant of a protein is less than one (Kd < 1)

If the dissociation constant of a protein is less than one (Kd < 1)

If the dissociation constant of a protein is less than one (Kd < 1), what can you conclude about the affinity of the protein for the ligand?

ppk   1141   1 Reply

bio_man