Practice Questions

TLS Online TPP Program

#Question id: 19841

Which of the following is true regarding Reverse transcriptase ?

#Unit 13. Methods in Biology

is used to proch1ce cDNA (complementary DNA) copies of, usually, mRNA that are used for creation of cDNA libraries
for removing 5' -phosphate from DNA ends.
for addition of phosphate group to an end having a free 5'-0H.
for removal of single-stranded protrusions from ends; both 3'- and 5'-extensions are removed.

More Questions

TLS Online TPP Program

#Question id: 11652

#Unit 10. Ecological Principles

The sequence of changes initiated by disturbance is called succession, and the ultimate association of species achieved is called

TLS Online TPP Program

#Question id: 26450

#Unit 3. Fundamental Processes

Which of the following statements is true regarding bacterial RNA polymerase

a. Core enzyme can efficiently transcribe both intact and nicked DNA

b. Sigma destabilizes nonspecifically bound core

c. Holoenzyme bind tightly to DNA

d. Higher disassociation rate at lower temperature

e. Most of the cellular sigma are house keeping gene

TLS Online TPP Program

#Question id: 12181

#Unit 2. Cellular Organization

Following statements are regarding to the CFTR.

A. cystic fibrosis transmembrane conductance regulator allows Cl− ions to flow out of the cell, following their concentration gradient.

B. ATP binding to CFTR’s two nucleotide-binding domains appears to close the Cl− channel, and the hydrolysis of one ATP opens it (the other ATP remains intact).

C. the CFTR channel can open only if its regulatory domain (which is unique among ABC transporters) has been phosphorylated, thus regulating the flow of ions across the membrane.

D. The maintenance of electrical neutrality requires that the Cl− ions transported by the CFTR be accompanied by positively charged ions, mainly Na+. The transported ions are osmotically accompanied by water, thus maintaining the proper level of fluidity in secretions of the airways, intestinal tract, and the ducts of the pancreas, testes, and sweat glands.

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 20272

#Unit 7. System Physiology – Animal

The factors that stimulate or inhibit the secretion of ADH by the posterior pituitary are:

a. Pain, nausea, hypoglycemia, and various drugs all inhibit the secretion of ADH.

b. Pain, nausea, hypoglycemia, and various drugs all stimulate the secretion of ADH.

c. Ethanol, α-adrenergic agonists, and atrial natriuretic peptide inhibit secretion of ADH.

d. Nicotine, opiates, antineoplastic agents stimulate the secretion of ADH.

Which one of the following combinations of above statements is correct?

TLS Online TPP Program

#Question id: 23342

#General Aptitude