#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.
#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 |
#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 |
#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?
#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:
#Question id: 40222
#Applied Microbiology
many cloning vectors, an antibiotic resistance gene is used for ________, while a gene like lacZ (for blue-white color change) is often used for ________.