Mock Exam IB DP Biology HL Paper 1 Set 1

Question

Two cells have the following characteristics.

Which deduction is supported by this information?
A. Both cells are from plants.
B. Cell I is more complex than cell II.
C. Cell II is an animal cell.
D. Cell I is prokaryotic.

Answer/Explanation

 

Question

More than 90% of cellular cholesterol is located in the cell’s plasma membrane. What is the
main role of cholesterol in the plasma membranes of mammalian cells?
A. To regulate membrane fluidity
B. To increase membrane solubility
C. To increase membrane permeability
D. To regulate membrane temperature

Answer/Explanation

 

Question

Which cell component arose first during the formation of the earliest cells?
A. Chloroplast
B. Plasma membrane
C. Mitochondria
D. Cell wall

Answer/Explanation

 

Question

 In which stage of the cell cycle are chromosomes duplicated?

A. G1 phase
B. G2 phase
C. S phase
D. Mitosis

Answer/Explanation

 

Question

 The images of the radiolarian, a single-celled marine organism,were produced using a light microscope (left) and a scanning electron microscope (right).

What is a reason for the difference in quality of these images?
A. Light cannot pass through the specimen.
B. Higher magnification can be achieved with the electron microscope.
C. The resolution of the electron microscope is higher.
D. Samples are stained with methylene blue when viewed with the light microscope.

Answer/Explanation

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