Biochemistry Answers

Following a heart attack, a physician orders a patient to begin taking a beta-blocker to treat angina and hypertension. The tablets are available in 50 mg. If the physician gradually increases the patient’s dosage, calculate the number of tablets required if the doctor requests 150 mg/day, 200 mg/day and 225 mg/day

A chemical dye absorbs light with wavelength 578 nm.

Using a standard solution of concentration 0.7 mM, the absorption is measured

to be 0.3 units. The absorption for a solution of unknown concentration is then

measured and found to be 0.1 units. What is the concentration? Give the answer to

at least 3 significant figures

Calculate the Orthoquinone formed (µg/ml) at 30 minutes incubation time? Unknown OD 0.076

Find the equation of the line which passes through the point (9,5) and has slope 1. Give your answer in the form y=m x+b. The constants should be given exactly, e.g., 1/3 rather than 0.33.

A reversible chemical reaction combines A and B to produce C and D. At equilibrium, A, B and C are present in concentrations 1 M, 0.05 M, 500 mM respectively.

If the rate constants are k1=2M^{-2}s^{-1} and k2 = 1 M^{-1} s^{-1}, what is the concentration of D in M at equilibrium? Give the result to three significant figures.

A chemical dye absorbs light with wavelength 578 nm.

Using a standard solution of concentration 0.7 mM, the absorption is measured

to be 0.8 units. The absorption for a solution of unknown concentration is then

measured and found to be 0.6 units. What is the concentration? Give the answer to

at least 3 significant figures.

1) If calcium and phospate ion concentrations are adequate for crustallisation, why desnt it occur throughout the body ?

2) if calcium and phospate ion concentrations are not adequate for crystallisation, why should it occur at all ? and suprisingly at specific locatio.

4. In organic chemistry and biochemistry labs, diethyl ether (CH₃CH₂OCH₂CH₃) and water (H₂O) are often used to do liquid/liquid extractions. These two liquids form two layers or are immiscible.  

(a) Why are they immiscible, i.e. why do they form two layers?

(b) You are extracting Vitamin Alpha and Vitamin Omega from a new microbe that has been discovered in an underwater steam vent and find that (i) Vitamin Alpha separates into the water fraction, what functional groups would you expect on it? Why? (ii) You find that Vitamin Omega separates into the diethyl ether fraction, what functional groups would you expect to find on it? Why?

Loose connective tissue