Ch 13 NSC 2025/2026 Exam Questions
and Correct Answers | New Update
Microbiome - 🧠 ANSWER ✔✔Collection of microorganisms that inhabits a
specific habitat, such as a human body.
Pathogen - 🧠 ANSWER ✔✔Disease-causing agent
Hydrothermal vent - 🧠 ANSWER ✔✔Underwater opening from which
mineral-rich water heated by geothermal energy streams out.
3 Hypotheses about the source of the organic building blocks for Earth's
first life - 🧠 ANSWER ✔✔1. Lightning fueled atmospheric reactions
2. Delivery from space via meteorites
3. Reactions at deep-sea hydrothermal vents
, Stanley Miller - 🧠 ANSWER ✔✔Hypothesized that lightning fueled
atmospheric reactions could produce simple organic compounds.
Iron-sulfur world hypothesis - 🧠 ANSWER ✔✔Hypothesis that life began in
rocks rich in iron sulfide near deep-sea hydrothermal vents.
Protocell - 🧠 ANSWER ✔✔Membranous sac that contains interacting
organic molecules; hypothesized to have formed prior to the earliest cells.
RNA world hypothesis - 🧠 ANSWER ✔✔Hypothesis that RNA served as the
first material of inheritance
Francis Crick and Leslie Orgel - 🧠 ANSWER ✔✔proposed the RNA world
hypothesis
Endosymbiont hypothesis - 🧠 ANSWER ✔✔hypothesis that mitochondria
and chloroplasts evolved from free-living bacteria that entered and lived
inside another cell.
Ozone layer - 🧠 ANSWER ✔✔Atmospheric layer with a high concentration
of ozone that prevents much UV radiation from reaching Earth's surface.
Stromatolites - 🧠 ANSWER ✔✔Dome-shaped structures composed of
layers of prokaryotic cells and sediments; forms in shallow seas.
and Correct Answers | New Update
Microbiome - 🧠 ANSWER ✔✔Collection of microorganisms that inhabits a
specific habitat, such as a human body.
Pathogen - 🧠 ANSWER ✔✔Disease-causing agent
Hydrothermal vent - 🧠 ANSWER ✔✔Underwater opening from which
mineral-rich water heated by geothermal energy streams out.
3 Hypotheses about the source of the organic building blocks for Earth's
first life - 🧠 ANSWER ✔✔1. Lightning fueled atmospheric reactions
2. Delivery from space via meteorites
3. Reactions at deep-sea hydrothermal vents
, Stanley Miller - 🧠 ANSWER ✔✔Hypothesized that lightning fueled
atmospheric reactions could produce simple organic compounds.
Iron-sulfur world hypothesis - 🧠 ANSWER ✔✔Hypothesis that life began in
rocks rich in iron sulfide near deep-sea hydrothermal vents.
Protocell - 🧠 ANSWER ✔✔Membranous sac that contains interacting
organic molecules; hypothesized to have formed prior to the earliest cells.
RNA world hypothesis - 🧠 ANSWER ✔✔Hypothesis that RNA served as the
first material of inheritance
Francis Crick and Leslie Orgel - 🧠 ANSWER ✔✔proposed the RNA world
hypothesis
Endosymbiont hypothesis - 🧠 ANSWER ✔✔hypothesis that mitochondria
and chloroplasts evolved from free-living bacteria that entered and lived
inside another cell.
Ozone layer - 🧠 ANSWER ✔✔Atmospheric layer with a high concentration
of ozone that prevents much UV radiation from reaching Earth's surface.
Stromatolites - 🧠 ANSWER ✔✔Dome-shaped structures composed of
layers of prokaryotic cells and sediments; forms in shallow seas.
