In order to view images in TEM staining process has to be done. What kind of staining process are done.

1. Negative staining

2. Gram staining

3. Metal shadowing 

4. Immuno staining

Which of the following is true for TEM?

TLS Online TPP Program

#Question id: 40216

#Environmental Science

Given below are two statements regarding the Miller-Urey experiment:

Statement I: The experiment used a mixture of Methane (CH₄), Ammonia (NH₃), Hydrogen (H₂), and Water vapor (H₂O) exposed to electric discharge.

Statement II: The experiment successfully synthesized complex nucleic acids (DNA chains) within the first week.

In light of the above statements, choose the most appropriate answer:

TLS Online TPP Program

#Question id: 40217

#Environmental Science

Consider the following statements about the Endosymbiotic Theory:

Statement I: It explains the origin of mitochondria and chloroplasts in eukaryotic cells.

Statement II: Mitochondria and chloroplasts have their own circular DNA, similar to bacteria.

Statement III: The theory proposes that these organelles originated as free-living prokaryotes that were engulfed by a host cell.

Which of the statements given above are correct?

TLS Online TPP Program

#Question id: 40218

#Environmental Science

Match the concepts/experiments in List I with the scientists in List II.

List I (Concept/Experiment)	List II (Scientist)
A. Hot Dilute Soup (Prebiotic Soup)	I. Francesco Redi
B. Panspermia (Cosmozoic Theory)	II. J.B.S. Haldane
C. Maggots in decaying meat experiment	III. Richter & Arrhenius
D. Omne vivum ex vivo (Biogenesis)	IV. Louis Pasteur

TLS Online TPP Program

#Question id: 40219

#Environmental Science

Match the evolutionary stages in List I with their defining characteristics in List II

List I (Evolutionary Stage)	List II (Characteristics)
A. Chemoheterotrophs	I. First oxygen-producing photosynthesizers (Cyanobacteria)
B. Chemoautotrophs	II. Earliest life forms; absorbed organic molecules from the environment
C. Photoautotrophs (Anoxygenic)	III. Synthesized food using chemical energy (inorganic substrates)
D. Photoautotrophs (Oxygenic)	IV. Used sunlight but H2S instead of water; did not release Oxygen

TLS Online TPP Program

#Question id: 40220

#Applied Microbiology

Which component of a plasmid vector allows a researcher to distinguish between host cells that have taken up the plasmid and those that have not?

TLS Online TPP Program

#Question id: 40221

#Applied Microbiology

 A gene incorporated into a vector that confers a trait suitable for artificial selection of transformed cells (e.g., survival on ampicillin-containing agar) is best known as a: