Biochemistry Answers

In bacterial cell the DNA is the ?

Show your complete solution to earn points. Glucose, a major energy-yielding nutri￾ent, is present in bacterial cells at a concentration of about 1.6mM (mM=millimolar). 

What is the concentration of glucose, expressed as mg/mL? How many glucose mol￾ecules contained in a typical E. coli cell? (Recall Avogadro’s number= 6.023x1023)

Given: Glucose concentration= 1mM= 1x10-3 mol/L, Molecular weight=180g/mol, Vol￾ume= 1x10-15 L

yeast cells can catabolise glucose under both aerobic conditions (respiration) and anaerobic conditions (fermentation/glycolysis). In this experiment, we will study both processes using a culture of Saccharomyces cerevisiae which has been aerobically adapted. By relating the amount of ethanol produced to the amount of glucose consumed over the same period of time, we will attempt to determine which process is the most efficient provider of energy to the yeast cells. This assumes of course that the energy needs of the cells are similar under the two sets of conditions. 

how can we determine which process is more efficient by calculating Moles ethanol produced per mole glucose catabolized ??

Meningitis is a disease that is characterized by swelling of the meninges that puts pressure on the brain. Which is least likely to be a symptom of this disease?

Under which of the following conditions is the R form of Hb favored?

a.At low O2 partial pressures, as in the lungs.

b.At high O2 partial pressures, as in muscles.

c.At low O2 partial pressures, as in muscles.

d.At high O2 partial pressures, as in the lungs.

e.The R form of Hb does not depend on the presence of O2

Identify and describe two ways that you can reduce the effectiveness of an enzyme

Almost no metabolic reaction is able to occur without the help of an enzyme. Explain how the structure of an allosteric enzyme and substrate function to control a metabolic pathway. Include a specific example in your answer. 

Suppose you are working in a lab to optimize enzyme activity and you observe that the enzyme activity decrease with increase in time. What could be the possible reason/s?

what is the value of glycine pKa of nh3 group

16. How do activators and inhibitors affects enzymes activity?