BIOLOGY ONLINE EXAM

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BIOLOGY ONLINE EXAM

This exam is to prepare grade 12 student for entrance

33. Which statement best justifies why oxidative phosphorylation is considered more efficient than substrate-level phosphorylation?

1 point

It produces heat that helps break down glucose

It directly uses glucose for energy

It generates a larger amount of ATP using a proton gradient

It does not require oxygen to function

Clear selection

34. In a laboratory experiment, a researcher adds a compound that binds with OAA (oxaloacetate), preventing it from reacting with acetyl-CoA. Which part of cellular respiration is directly affected?
*

1 point

Electron transport chain

Krebs cycle

Alcoholic fermentation

Glycolysis

36. Imagine you are designing a plant for high photosynthetic efficiency in a hot, dry climate. Which combination of features would you include?

1 point

Opening stomata at night and storing CO₂ as malate

Fixation of CO₂ directly into glucose in the roots

Photosystem I working alone with high oxygen release

Use of Rubisco in mesophyll cells and open stomata during the day

Clear selection

38. What conclusion can be drawn from the idea that early life was heterotrophic rather than autotrophic?

1 point

Early organisms survived by using available organic compounds.

Early organisms absorbed energy from sunlight and ammonia.

Early organisms lived near volcanoes using hydrogen and sulfur.

Early organisms made food using carbon dioxide and iron.

Clear selection

32. During cellular respiration in a human muscle cell, where would the protons (H⁺) accumulate to create a gradient for ATP production?

1 point

In the intermembrane space of the mitochondrion

In the mitochondrial matrix

In the cytoplasm

in the inner membrane of mitochondria

Clear selection

Which of the following is NOT considered direct evidence for evolution?

1 point

Comparative anatomy

Fossil record

Molecular homology

Artificial selection

Clear selection

37. How do the theories of spontaneous generation and eternity of life differ in their explanation of the origin of life?

1 point

Spontaneous generation states life comes from non-life, while eternity claims life always existed.

Spontaneous generation refers to divine origin, while eternity of life supports science.

Spontaneous generation and eternity both explain life in the same scientific manner.

Spontaneous generation disagrees with Redi, while eternity of life supports his findings.

Clear selection

35. Which pathway (C3, C4, or CAM) is most efficient for water conservation in desert environments?

1 point

CAM pathway

All are equally efficient

C4 pathway

C3 pathway

Clear selection

39. Why did the Miller experiment support the Oparin-Haldane theory of life’s origin?

1 point

It demonstrated that lightning could form amino acids from gases.

It proved that cells come from simple gases and light energy.

It produced cells directly from ammonia and ultraviolet radiation.

It showed how water alone forms life under extreme dry air.

Clear selection

40. Why is antibiotic resistance in bacteria a modern example of natural selection?

1 point

Resistant bacteria survive and reproduce when antibiotics are used.

All bacteria develop resistance quickly without mutations.

Antibiotics cause bacteria to grow faster and larger

Only old bacteria survive because young ones are not exposed.

Clear selection

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