Practice Questions

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.

#Part-B Specialized Branches in Biotechnology

(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.
(i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.
(iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.
(i) – The A form which is observed under low humidity has a structure similar to the structure that RNA adopts when double-helical.

More Questions

TLS Online TPP Program

#Question id: 19457

#Part-A Aptitude & General Biotechnology

Which microscopy can be used for viewing live cells and unstained tissues?

1. Fluorescence microscopy

2. Phase contrast microscopy

3. Dark field microscopy

4. Differential interference microscopy

5. Confocal microscopy

Which of the above combinations of microscopy is correct?

TLS Online TPP Program

#Question id: 19457

#Part-B Specialized Branches in Biotechnology

Which microscopy can be used for viewing live cells and unstained tissues?

1. Fluorescence microscopy

2. Phase contrast microscopy

3. Dark field microscopy

4. Differential interference microscopy

5. Confocal microscopy

Which of the above combinations of microscopy is correct?

TLS Online TPP Program

#Question id: 19458

#Part-A Aptitude & General Biotechnology

How phase contrast and DIC microscopy are used to image live cells and unstained tissues?

TLS Online TPP Program

#Question id: 19458

#Part-B Specialized Branches in Biotechnology

How phase contrast and DIC microscopy are used to image live cells and unstained tissues?

TLS Online TPP Program

#Question id: 19459

#Part-A Aptitude & General Biotechnology

Phase-contrast microscopy depends on the refractive index of the region of specimen and generates image in which we see a pattern of

TLS Online TPP Program

#Question id: 19460

#Part-A Aptitude & General Biotechnology

In phase contrast unobstructed light passes through a region of________ that both transmits only a small percentage of the light and changes its phase slightly.