Biochemistry Answers

The focal length of the human eye is approximately 1.7cm.

Part A

What is thef-number for the human eye in bright light, when the pupil diameter is2.5mm?
f_{\rm number}= __________

Part B
What is thef-number in dim light, when the pupil diameter has expanded to7.0mm?
f_{\rm number}= __________

Express your answers using two significant figures.

What will be the probable number of type of genotypes in a cross AABBCC×aabbcc in F2 ?
a)27 b)64 c)8 d)81

A pregnant woman, who has done amniocentesis test,finds an extra barr body in her embryo.The syndrome which is likely to be associated with embryo is- a)Edward's syndrome b)Down's syndrome c)Klinefelters syndrome d)Patau's syndrome.

In a cross between a pure tall pea plant with green pod and a pure short plant with yellow pod,how many short plants out of 16 you would expect in F2 generation?

respiration in arthropods occurs through--------??

animals with 2 layered body wall enclosing a single cavity opening on one sidde only are one of the charecteristics of which phylum???

Read the following from the perspective of a dietitian. In point form, write five statements that you would discuss with Curtis, with the goal of improving his health. For each point, add a sentence that gives him information about metabolism that he should be aware of and the reason why he should consider changing his diet and lifestyle.

Curtis is a 50 year old male. His job is sedentary and he participates in no regular physical activity. He quit smoking when he was 40, after having had a near-fatal heart attack. His mother and father both suffered heart attacks in their fifties and his grandmother (on his mothers side had two strokes. He drinks energy drinks in the morning with bacon and eggs, and has two hamburgers and a plate of fries for lunch everyday. He always has a serving of meat and salad for dinner, and a bag of potato chips and a diet soft drink for a snack in the evening.

After not eating all day and feeling absolutely famished, you eat a meal high in vitamin A. Predict and explain what type of transport process (described in class; ie, simple diffusion, facilitated diffusion, or active transport) that you expect the vitamin to use to cross your intestinal membranes.

Red blood cell membranes are completely impermeable to sodium, potassium and chloride ions, however they are permeable to both water and urea. The concentration inside a red blood cell is 300mOsm and consists predominantly of sodium and potassium chloride.
a) With the aid of diagrams, decide what would happen to red blood cells when placed in the following solutions.
i. Fresh water.
ii. Salt solution at a concentration of 300mOsm.
iii. Salt solution at a concentration of 400mOsm. iv. A urea solution at a concentration of 300mOsm.
b) Which solutions were isosmotic to the red blood cells? c) Which solutions were isotonic to the red blo

Why the serum is used instead of the plasma in measuring total blood protein ?
Is it unnecessary to measure the clotting factors in measuring total blood protein ?