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TLS Online TPP Program

#Question id: 20311

Which of the following is INCORRECT about Aldosterone;

#Unit 7. System Physiology – Animal
  1. Aldosterone exerts nearly 90 percent of the mineralocorticoid activity of the adrenocortical secretions, but cortisol, the major glucocorticoid secreted by the adrenal cortex.
  2. Aldosterone’s mineralocorticoid activity is about 3000 times greater than that of cortisol, but the plasma concentration of cortisol is nearly 2000 times that of aldosterone.
  3. Aldosterone increases reabsorption of potassium and simultaneously increases secretion of sodium by the renal tubular epithelial cells, especially in the principal cells of the collecting tubule
  4. A high concentration of aldosterone in the plasma can transiently decrease the sodium loss into the urine to as little as a few milliequivalents a day
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TLS Online TPP Program

#Question id: 2250

#Unit 2. Cellular Organization

Which of the following is true about cystic fibrosis?
TLS Online TPP Program

#Question id: 2251

#Unit 2. Cellular Organization

Differences between cotransport and active ion transport include
TLS Online TPP Program

#Question id: 2252

#Unit 2. Cellular Organization

The generation and maintenance of a membrane electric potential requires which of the following:

a. active pumping of ions       

b. ion-specific membrane channel proteins

c. ATP                                    

d. a generally permeable membrane
TLS Online TPP Program

#Question id: 2253

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following lipid linked proteins (column I) with their function (Column II).

Column I

Column II

A. prenylated proteins

i. These proteins are located in a number of subcellular compartments, including the cytosol, the endoplasmic reticulum, the inner face of the plasma membrane, and the nucleus.

B. fatty acylated proteins

ii. The core structure of these proteins consists of phosphatidylinositol glycosidically linked to a linear tetrasaccharide composed of three mannose residues and one glucosaminyl residue.

C. glycosylphosphatidylinositol-linked proteins

iii. The proteins that have covalently attached lipids that are built from isoprene units

TLS Online TPP Program

#Question id: 2253

#Unit 2. Cellular Organization

Match the following lipid linked proteins (column I) with their function (Column II).

Column I

Column II

A. prenylated proteins

i. These proteins are located in a number of subcellular compartments, including the cytosol, the endoplasmic reticulum, the inner face of the plasma membrane, and the nucleus.

B. fatty acylated proteins

ii. The core structure of these proteins consists of phosphatidylinositol glycosidically linked to a linear tetrasaccharide composed of three mannose residues and one glucosaminyl residue.

C. glycosylphosphatidylinositol-linked proteins

iii. The proteins that have covalently attached lipids that are built from isoprene units

TLS Online TPP Program

#Question id: 2254

#Unit 2. Cellular Organization

If the intracellular [Ca2+] is 10−7 mol/L and the extracellular [Ca2+] is 2 × 10−3 mol/L, at what potential difference across the cell membrane will Ca2+ be at electrochemical equilibrium?