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TLS Online TPP Program

#Question id: 2220

Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature?

#Unit 2. Cellular Organization

  1. Since the cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium, the membrane must be asymmetrical.

  2. Since cell membranes communicate signals from one organism to another, the cell membranes must be asymmetrical.

  3. The two sides of a cell membrane face different environments and carry out different functions.

  4. Proteins only function on the cytoplasmic side of the cell membrane, which results in the membrane's asymmetrical nature.

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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
TLS Online TPP Program

#Question id: 33982

#Unit 2. Cellular Organization

A. Chromosomes occupy chromosome territories in the nucleus and very much entangled with each other. 
B. Heterochromatic regions, silenced genes, and gene-sparse regions of chromosomes are typically localized to the nuclear periphery and center of nucleus. 
C. Active genes are often found at the borders and of chromosome territories
D. Active genes from several chromosomes may cluster in inter-chromosomal territories that are enriched in transcription machinery

Choose true and false