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TLS Online TPP Program

#Question id: 10365

Why the nitrogenase enzymes catalyzes the nitrogen fixation reaction only in microanaerobic or anaerobic conditions?

#Environmental Science
  1. O2 form ROS (reactive oxygen species) that inhibits the enzyme nitrogenase
  2. Oxygen, being a strong electron acceptor, can damage these sites and irreversibly inactivate nitrogenase, so nitrogen must be fixed under anaerobic conditions
  3. Because lack a PSI, the oxygen-producing photosystem of chloroplasts, so they do not generate oxygen
  4. nitrogenase enzymes only active in anaerobic environment and inhibit in the aerobic environment due to O2
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TLS Online TPP Program

#Question id: 2750

#Zoology

Which of the following is true of histones?
TLS Online TPP Program

#Question id: 2756

#Zoology

The major protein components of chromatin referred as:
TLS Online TPP Program

#Question id: 2757

#Zoology

_______________ a protein that affects the folding of other proteins or the assembly of complex structures.
TLS Online TPP Program

#Question id: 2775

#Zoology

To examine the folding and compaction of chromatin during mitosis, you will need to isolate and stain chromosomes at a particular stage using a special spreading preparation technique. For the best analysis, the chromosomes must be at which one of the following stages?
TLS Online TPP Program

#Question id: 2776

#Zoology

There are five major types of histone proteins, but only four of them are considered as core histones. Which one of the following is NOT considered a core histone protein?
TLS Online TPP Program

#Question id: 2777

#Zoology

Histone modifications play integral roles in chromatin condensation and function. Which of the following is NOT considered to be a histone modification?