TLS Online TPP Program

#Question id: 1195


Growth factors are local regulators that:

#Unit 4. Cell Communication and Cell Signaling
  1. are modified fatty acids that stimulate bone and cartilage growth

  2. are found on the surface of cancer cells and stimulate abnormal cell division

  3. bind to cell-surface receptors and stimulate growth and development of target cells

  4. convey messages between nerve cells

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TLS Online TPP Program

#Question id: 33909

#Unit 2. Cellular Organization

What is the Lk of a 5,000 bp circular duplex DNA molecule with a nick in one strand?

TLS Online TPP Program

#Question id: 33910

#Unit 2. Cellular Organization

What is the Lk of a 5,000 bp circular duplex DNA molecule after eight enzymatic turnovers by a single molecule of DNA gyrase in the presence of ATP?

TLS Online TPP Program

#Question id: 33911

#Unit 2. Cellular Organization

What is the Lk of a 5,000 bp circular duplex DNA molecule after eight enzymatic turnovers by a single molecule of DNA gyrase in the presence of ATP followed by 8 enzymatic turnovers by a single molecule of bacterial type I topoisomerase

TLS Online TPP Program

#Question id: 33912

#Unit 2. Cellular Organization

A. When a DNA molecule is negatively supercoiled, it is underwound. 
B. Any structural change involving DNA strand separation becomes more likely in negatively supercoiled DNA. 
C. Negative supercoiling makes establishment of left-handed Z-DNA in a segment of DNA 
D. The formation of plectonemic or solenoidal supercoils is favored as a means of negative supercoiling.

Find true and false

TLS Online TPP Program

#Question id: 33913

#Unit 2. Cellular Organization

A. Underwinding of a B-DNA helix might facilitate or stabilize the formation of Z-DNA.
B. Underwinding aids in the transition by providing a local region of unwound DNA that allows the shift to Z-DNA.
C. Overwinding of a B-DNA helix might facilitate or stabilize the formation of Z-DNA.
D. Overwinding aids in the transition by providing a local region of unwound DNA that allows the shift to Z-DNA.

What is correct combination of statements

TLS Online TPP Program

#Question id: 33981

#Unit 2. Cellular Organization

The scaffold-associated regions are separated by loops of DNA. The scaffold itself may contain several proteins such as
A. Topoisomerase
B. SMCs
C. RNA Polymerase