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TLS Online TPP Program

#Question id: 801

Identify the type of DNA from the structures given below and match the correct form with its characteristics described.

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. (ii) – The more compact A form of DNA has 11 bp per turn and shows a large tilt of the base pairs with respect to the helix axis.

  2. (i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.

  3. (iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.

  4. (i) – The A form which is observed under low humidity has a structure similar to the structure that RNA adopts when double-helical.

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TLS Online TPP Program

#Question id: 11941

#Unit 7. System Physiology – Animal

Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?
TLS Online TPP Program

#Question id: 11942

#Unit 7. System Physiology – Animal

A patient’s urine is collected for 2 hr, and the total volume is 600 ml during this time. Her urine osmolarity is 150 mOsm/L, and her plasma osmolarity is 300 mOsm/L. What is her “free water clearance”?
TLS Online TPP Program

#Question id: 11944

#Unit 7. System Physiology – Animal

The maximum clearance rate possible for a substance that is totally cleared from the plasma is equal to which of the following?
TLS Online TPP Program

#Question id: 11945

#Unit 7. System Physiology – Animal

A patient has the following laboratory values: arterial pH = 7.13, plasma HCO3− = 15 mEq/L, plasma chloride concentration = 118 mEq/L, arterial Pco2 = 28 mm Hg, and plasma Na+ concentration = 141 mEq/L. What is the most likely cause of his acidosis?
TLS Online TPP Program

#Question id: 12070

#Unit 7. System Physiology – Animal

A 26-year-old man develops glomerulonephritis, and his GFR decreases by 50% and remains at that level. For which of the following substances would you expect to find the greatest increase in plasma concentration?
TLS Online TPP Program

#Question id: 12071

#Unit 7. System Physiology – Animal

The most serious hypokalemia would occur in which of the following conditions?