Biochemistry

how to find hill nnumber and min of subunit

how to find hill nnumber and min of subunit

How do you find the hill number (nH) and  minimum number of subunits in a hill plot graph? Can you give me like an example to show me it? Thnks!

lisa142   2219   4 Replies

duddy

Help Please :) NaOH

Help Please :) NaOH

For each of the following circumstances indicate where the calulated molarity of NaOH would be lower, higher, or unaffected. Explain your answer:
a) the inside of the pipet used to transfer the standard HCl solution was wet with water.
b) Y

gh1991   5453   2 Replies

duddy

Calculate proton motive force

Calculate proton motive force

1) calculate the proton motive force across the inner mitochondrial membrane @ 25 degrees Celsius when the electrical difference is -0.18 V (inside negative), the pH outside is 6.7 and the pH inside is 7.5

Proton motive force = -2.303RTdel

09mohamf   7762   2 Replies

bio_man

Erythrocytes Membrane

Erythrocytes Membrane

I don't understand the following. Please help me. I'm more interested in the explanation if you can. Thank you!

 1) Membrane lipids from 4.74*109 erythrocytes form a monolayer of 0.89 m2 in water.  The surface area of an ave

superhero   1876   6 Replies

bio_man

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!

electrochemistry

electrochemistry

What is the standard cell potential for an electrochemical cell in which this reaction takes place:
Malate + NAD <-> Oxaloacetate + NADH + H+

This is how I did it:
Malate?Oxaloacetate + 2e- + 2H+       

emily   915   2 Replies

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

drawing the structures

drawing the structures

How would you draw the following structures? Please guide me where to start..
A) 18:1c?11
B) Saturated FA w/ Tm < 30oC

linda   2158   7 Replies

duddy

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

Amino acid structure

Amino acid structure

I apologise if this has an obvious simple answer- I have been looking at this and cannot figure it out, I'm sure it has a very straightforward answer.

I have always been taught than an amino acid looks like this:
[url=http://commo

lrob   1305   4 Replies

duddy

Pathways/Cycles...

Pathways/Cycles...

Where in the cell do the following pathways occur (cytoplasm? nucleus?, etc)
Pyruvate Dehydrogenase
Glycolysis
Krebs Cycle
Gluconeogenesis
Electron Transport
Beta Oxidation

shelby88   1253   4 Replies

duddy

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

watching TV and eating "junk food"

watching TV and eating "junk food"

Todd is 13 and lives in an urban apartment. He spends most of his time watching TV and eating "junk food" (low in nutrition, high in calories). One afternoon during gym class, he falls on the playground and breaks his leg. Although he appea

ppk   1236   3 Replies

sarah!

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!

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

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

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

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

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

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

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

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

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

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

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

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

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

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 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

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

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 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

Define hypertrophy and hyperplasia, and describe their hormone regulation.

Define hypertrophy and hyperplasia, and describe their hormone regulation.

Define hypertrophy and hyperplasia, and describe their hormone regulation.

ppk   1420   2 Replies

ppk

What are the symptoms and causes of Cushing's disease?

What are the symptoms and causes of Cushing's disease?

What are the symptoms and causes of Cushing's disease? How do they compare and contrast with symptoms and causes of Addison's disease?

ppk   771   3 Replies

duddy

While every level of a protein’s structure is important to the function of that protein...

While every level of a protein’s structure is important to the function of that protein...

While every level of a protein’s structure is important to the function of that protein, which level of structure is most important to the function of enzymes, and why?

ppk   3232   1 Reply

bio_man

List and distinguish between the level(s) that produce a linear shape vs. a glob

List and distinguish between the level(s) that produce a linear shape vs. a glob

Proteins are described as having different levels of structure. List and distinguish between the level(s) that produce a linear shape vs. a globular shape, and explain why one of those levels can result in either a linear or globular shape.

ppk   761   1 Reply

bio_man

Stanley Student is confused on the similarities and differences between proteins

Stanley Student is confused on the similarities and differences between proteins

Stanley Student is confused on the similarities and differences between proteins and nucleic acids. Assuming he has learned and understood the basic chemistry, what is the likely source of his confusion? To help him sort this out, make a table or flo

ppk   1734   1 Reply

bio_man

Your roommate is not a science major but is interested in science and asks you t

Your roommate is not a science major but is interested in science and asks you t

Your roommate is not a science major but is interested in science and asks you to verify a rumor he has heard: it is theoretically possible for two people to walk through each other without causing harm. Confirm or refute what he has heard, and expla

ppk   1077   1 Reply

bio_man