Practice Questions

TLS Online TPP Program

#Question id: 10365

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

#Unit 6. System Physiology – Plant

O2 form ROS (reactive oxygen species) that inhibits the enzyme nitrogenase
Oxygen, being a strong electron acceptor, can damage these sites and irreversibly inactivate nitrogenase, so nitrogen must be fixed under anaerobic conditions
Because lack a PSI, the oxygen-producing photosystem of chloroplasts, so they do not generate oxygen
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: 15774

#Unit 5. Developmental Biology

When the inner cells are removed from the mammalian embryo and cultured in vitro, they establish a population of pluripotent cells, which is

TLS Online TPP Program

#Question id: 5681

#Unit 5. Developmental Biology

What is the arrangement of microtubules in sperm flagellum?

TLS Online TPP Program

#Question id: 18390

#Unit 12. Applied Biology

Which bacterium is mainly found at quite high ionizing radiation zones or areas?

TLS Online TPP Program

#Question id: 20385

#Unit 13. Methods in Biology

PCR primer dimers are formed when

TLS Online TPP Program

#Question id: 15721

#Unit 11. Evolution and Behavior

Lamarck argued that species differ from one another because they have different needs, and so use certain of their organs and appendages. This hypothesis is known as?