Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 63520
TLS Online TPP Program

#Question id: 1440

Which of the following is NOT evidence that smoking causes lung cancer?

#Biochemistry

  1. Epidemiological rates of lung cancer dramatically increased after more people started to smoke.

  2. Exposure of lung cells to the active carcinogen found in cigarettes causes mutations in p53.

  3. Mutations in p53 are found in the same codons in patients with lung cancer who smoke as in cultured cells treated with benzo(a)pyrene.

  4. Epidemiological rates of lung cancer in women increased years after the rates in men increased.

More Questions
TLS Online TPP Program

#Question id: 40215

#Environmental Science

Match the geological eons/events in List I with the biological milestones in List II.

List I (Time Period/Event)List II (Biological Milestone)
A. 4.0 - 3.8 Billion years agoI. Appearance of first Eukaryotes
B. 3.5 Billion years agoII. Oxygen Revolution (Great Oxidation Event)
C. 2.7 - 2.5 Billion years agoIII. Appearance of first cellular life (Prokaryotes)
D. 2.0 - 1.5 Billion years agoIV. Formation of life precursors (RNA/Protocells)
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 experimentIII. 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. ChemoheterotrophsI. First oxygen-producing photosynthesizers (Cyanobacteria)
B. ChemoautotrophsII. 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?