TLS Online TPP Program

#Question id: 10432


Phytochrome interacting factors (PIFs) act as negative regulators of photomorphogenesis such as;
a) Most PIFs are constitutive activators of genes that are expressed in the dark or in response to shade
b) Most PIFs are constitutive repressor of genes that are expressed in the dark or in response to shade
c) In the light, Pfr promotes the degradation of the PIFs, blocking the transcription of skotomorphogenesis genes
d) In the light, Pfr promotes the activation of the PIFs, blocking the transcription of skotomorphogenesis genes
Which of the following combinations is correct about PIFs?

#Unit 6. System Physiology – Plant
  1. A and C
  2. B and C
  3. B and D
  4. A and D
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TLS Online TPP Program

#Question id: 2913

#Unit 2. Cellular Organization

Genome size (the length of DNA associated with one haploid complement of chromosomes) varies substantially between different organisms. Because more genes are required to direct the formation of more complex organisms, it is not surprising that genome size is roughly correlated with an organism’s apparent complexity. Which of the following statements is/are correct in reference to this rough correlation?

I. Many organisms of apparently similar complexities have very different genome sizes.

II. The number of genes, rather than genome size, is more closely related to organism complexity.

III. There is a roughly inverse correlation between organism complexity and gene density—the less complex the organism, the higher the gene density.

IV. Gene density in eukaryotic organisms is consistently higher and more variable than in their prokaryotic counterparts.

TLS Online TPP Program

#Question id: 2914

#Unit 2. Cellular Organization

The human genome is composed of many different types of DNA sequences, the majority of which do not encode proteins. Shown are the distribution and amount of each of the various types of sequences. Mark the correct options containing appropriate input for boxes A and B.

TLS Online TPP Program

#Question id: 2915

#Unit 2. Cellular Organization

The structural maintenance of chromosome (SMC) proteins are extended proteins that form defined pairs by interacting through lengthy coiled-coil domains. Together with non-SMC proteins, they form multiprotein complexes that act to link two DNA helices together. Identify the SMC proteins in the figure given below and match them with their respective subunits.

i. Blue – Cohesin made up of Smc 1 and Smc 2 proteins.

ii. Green – Condensin made up of Smc 3 and Smc 4 proteins.

iii. Blue – Condensin made up of Smc 2 and Smc 4 proteins.

iv. Green – Cohesins made up of Smc 1 and Smc 3 proteins.

v. Blue – Condensin made up of Smc 1 and Smc 3 proteins.

vi. Green – Cohesins made up of Smc 2 and Smc 4 proteins.

TLS Online TPP Program

#Question id: 2916

#Unit 2. Cellular Organization

Which of the following statement is INCORRECT regarding the packaging of DNA into higher order chromatin structure?

TLS Online TPP Program

#Question id: 2917

#Unit 2. Cellular Organization

With respect to the interconversion between open and condensed chromatin shown below: Which of the directions (i) or (ii) would you anticipate would be the consequence of the following types of chromatin modification?

TLS Online TPP Program

#Question id: 2918

#Unit 2. Cellular Organization

Some DNA sequences in our cells have high frequencies of methylated cytosines (hypermethylation); some others have a low frequency of methylated cytosines (hypomethylation). Which of the two methylation states best describes the kind of sequences listed below? 

 I. Satellite DNA in pericentromeric heterochromatin

II. Promoters 

III. Dispersed transposon repeats

IV. CpG islands 

V. Enhancers