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Biological Chemistry

Free Energy Changes in Glycolysis

Free Energy changes in glycolysis. a) Which three reactions are irreversible? What does this mean? b) The other seven reactions are near equilibrium. Explain how this diagram reflects this. Please see attached for the full question (ignore question 7.)

Signal amplification is explored.

The signaling mechanisms used by a steroid-hormone receptor and by an ion channel linked receptor have very few components. Can either mechanism lead to an amplification of the initial signal? If so, how? Ideas are included.

Vitamin A 0.05% gel

I am trying to find out which chemical form of vitamin A is used in pharmaceutical gels. - Vitamin A 0.05% gel for pharmaceutical 1) vitamin A 2) vitamin A Aldehyde 3) 9-cis-Retinoic Acid 4) 13-cis-Retinoic Acid

Life on Earth - 8 Short Questions.

Life on Earth - Biological Concepts from the Non-Science Major Perspective Quiz: (1 point each) 1. Describe the difference between and exergonic and endergonic reaction? 2. Why do environmentalists claim that an increase in forests, i.e. rainforests, will slow down the effects of global warming? 3. Explain how fats a

Oxidation of palmitate

Estimate the amount of energy a mammal can obtain from the oxidation of palmitate, in the liver under conditions of ketosis, relative to the amount obtainable under conditions of a balanced diet with adequate consumption of glucogenic fuels.

Major pathway of glycine degradation

In order to determine the major pathway of glycine degradation, you devise an experiment in which mice are fed 13C(alpha)-labeled glycine, and the livers are then isolated and radioactive intermediates detected by GC-MS. Interestingly, you find that the amino acid serine contains the most radioactivity, and that both the Calpha

GRE subject Biochem

Discuss the feasibility of using methylation analysis to distinguish between each of the following pairs of carbohydrates: A) Maltose and Trehalose B) Maltose and Amylose C) Amylose and Cellulose

Inhibitors: Irreversible and Reversible

Question: It is possible to distinguish between an irreversible inhibitor and a classical mixed type reversible inhibitor by measuring Vmax of the enzymatic reaction as a function of [E]t in the absence and presence of the inhibitor. What does the slope represent in each case? What does the X-axis intercept represent in

Biophysics - Calculating deltaG

In one day the average person secretes about 2.5 litres of gastric juice into the stomach. The pH of the cells in the stomach lining that perform the secretion is about 7 (the same as for all cells) and the pH of the stomach is about 1. Thus, H+ ions must be moved against an H+ gradient. The free energy change for moving molecul

Converting Units Examples

1. A deep space probe is traveling at a velocity of 18.8km/s. What is its velocity in miles/minutes? 2. Astronomers have measured a faint galaxy to be at a distance of 200 megaparsecs from earth? How far is this in miles? (1 Parsec = 3.26 Light-years, Mega = 1x10^6). 3. A perfume company wants to dispense 13.9 quarts of a

Equation for Flight

Hi, I need assistance setting up an equation for the following problem: A bird is flying around the world at a rate of 14.5 ft/sec. How many days will it take to complete its journey?(circumference of earth=25000 miles)

Setting Up Equations

Hi, I need assistance setting up an equation for this problem: Problem: If a satellite orbits the earth at a velocity of 3.2x10 to the fourth power km/hr, this would be the same as how many ft/min?


Butter that is spreadable even when cold - does this have anything to do with oleic acid passing through the cow's digestive system in to the milk?


How would feeding cows rape seed increase the level of good fats in their milk?

Gibbs Free Energy: ATP-coupled reactions:

Calculate the change in G value for the reactions: (include change in Energy in the answer). (a) Phosphocreatine + ATP --> creatine + ATP (b) ATP + fructose --> ADP + fructose 6-phosphate

Carbonic Anhydrase: Calculate Turnover Number

Please help with the following problem. Provide step by step calculations. Carbonic anhydrase of red blood cells, which has a molecular weight of 30,000, is among the most active known enzymes. It catalyzes the reversible hydration of CO2, which is important for the transport of carbon dioxide from the tissues to the lungs.

Single enzyme that will breakdown all proteins,lipids, and carbs??

A friend of yours has just received a new dietary supplement purchased online. The bottle states that the single enzyme it contains will break down all proteins, lipids, and carbohydrates in food we eat into smaller easily digestible pieces. the bottle also states that the enzyme is an "organic protein." has your friend been mis

Cleaning Products, Proteins and Macromolecules

Please help with the following problem. You are the owner of a company that sells cleaning products. The people in research and development have two new products for you to review. The first is a type of hand soap that they say cuts grease because "it is from lipid and like dissolves like." The second is a laundry detergent

Please Help

What is the pH of 4% (w/v) solution of Ca(OH)2? Assume that Ca(OH)2 is 100% dissociated.

Need Help

What is the pK of a monoprotic acid if it is known that at pH 3, 75% of the acid is in dissociation for (A)?

Formula of "Cacium Polycarbophil"

What is the formula of calcium polycarbophil? Calcium Polycarbophil is the calcium salkt of polyacrylic acid cross linked with divinyl glycol. But what is its forumla? I am looking for something in the format Ca[Ca3H4O3]n....etc. Be sure to includes a way to convey the subscript numbers.

Trematol Poisoning

Why does physical exertion increase symptoms of poisoning by trematol? Why does the pH of the blood decrease in a person who has digested trematol?