TLS Online TPP Program

#Question id: 12957


Dichlorodiphenyltrichloroethane is related to the phenomenon of:

#Unit 10. Ecological Principles
  1. Biomagnification in food webs
  2. Coral bleaching in oceans
  3. The greenhouse effect 
  4. Ozone layer depletion
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TLS Online TPP Program

#Question id: 12718

#Unit 6. System Physiology – Plant

primary disruptions could be signaling the plant that a change in environmental conditions has occurred and that it’s time to respond by altering existing pathways or by activating stress-response pathways. At least five different types of stress-sensing mechanisms can be distinguished:

                       

                          COLUMN I

 

 

                              COLUMN II

 

A) Physical sensing

 

 

i) usually results from the detection of by-products that accumulate in cells due to the uncoupling of enzymatic or electron transfer reactions, such as the accumulation of ROS during stress caused by too much light.

 

 

B) Biophysical sensing

 

 

ii) often involves the presence of specialized proteins that have evolved to sense a particular stress; for example, calcium channels that can sense changes in temperature and alter Ca2+ homeostasis.

 

 

C) Metabolic sensing

 

 

iii) refers to modifications of DNA or RNA structure that do not alter genetic sequences, such as the changes in chromatin that occur during temperature stress.

 

 

D) Biochemical sensing

 

 

iv) refers to the mechanical effects of stress on the plant or cell structure, for example, the contraction of the plasma membrane from the cell wall during drought stress.

 

 

E) Epigenetic sensing

 

 

v) might involve changes in protein structure or enzymatic activity, such as the inhibition of different enzymes during heat stress.

 

 

  
Match the correct sequence sensing mechanism during in stress;

TLS Online TPP Program

#Question id: 13147

#Unit 8. Inheritance Biology

A cross was made between pure Blue and long pollen length with white and short pollen length. The F1 were test crossed. The F2 progeny obtained was as follows:
The genetic distance (cM) between flower colour and pollen length is;

TLS Online TPP Program

#Question id: 26437

#Unit 3. Fundamental Processes

GC – TA transversion caused by the insertion of

TLS Online TPP Program

#Question id: 4145

#Unit 3. Fundamental Processes

Steriod hormone response elements (HREs) are _ , which, when bound to _, alter gene expression at the level of _.

TLS Online TPP Program

#Question id: 1419

#Unit 4. Cell Communication and Cell Signaling

Mitochondrial permeabilization can be induced by compounds that poke small holes in the outer membrane. This would cause: