Question 1

Which of the following is NOT one of the essential attributes that distinguish living from nonliving systems according to Koshland's seven pillars of life?

Accepted Answer

Photosynthesis

Question 2

What is the primary function of compartmentation in biological cells?

Accepted Answer

To allow for maintenance of high local concentrations of biological molecules

Question 3

Which of the following statements best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain internal membranes and organelles, while prokaryotic cells do not.

Question 4

Which of the following is a correct description of the hydrogen bond in water?

Accepted Answer

It is an electrostatic attraction between the partial positive charge on hydrogen and the partial negative charge on oxygen.

Question 5

Given the bond angle in a water molecule is $$104.5^	ext{o}$$, which factor causes this deviation from the expected tetrahedral angle of $$109.5^	ext{o}$$?

Accepted Answer

Greater repulsion between electron pairs on the oxygen atom

Question 6

Which of the following is NOT a basic shape of prokaryotic cells?

Accepted Answer

Cuboidal

Question 7

Why is water considered central to biochemistry?

Accepted Answer

Its physical and chemical properties influence the function of biological molecules.

Question 8

Which organelle is responsible for the breakdown of long chain fatty acids in eukaryotic cells?

Accepted Answer

Peroxisome

Question 9

A scientist observes a cell with multiple linear DNA molecules, a cytoskeleton, and internal organelles. What type of cell is this?

Accepted Answer

Eukaryotic cell

Question 10

Which of the following best explains why concentrated substances in cellular compartments react more readily?

Accepted Answer

Higher local concentrations increase the likelihood of molecular collisions, enhancing reaction rates.

Question 11

Which of the following is a function of the plasma membrane in eukaryotic cells?

Accepted Answer

Serves as a chemical barrier to the outside environment

Question 12

Which property of water allows it to participate in many chemical reactions that support life?

Accepted Answer

Its ionized form

Question 13

Which of the following statements about prokaryotic cells is TRUE?

Accepted Answer

They lack specific compartmentation but have metabolic functions in specific regions of cytoplasm.

Question 14

Which organelle is the site of oxidative energy production in eukaryotic cells?

Accepted Answer

Mitochondria

Question 15

Which of the following best describes the role of hydrogen bond donors and acceptors in biomolecular interactions?

Accepted Answer

Donors supply hydrogen atoms, acceptors provide lone pairs of electrons.

Question 16

Which of the following is a consequence of the polar nature of water molecules?

Accepted Answer

Water molecules form directional intermolecular associations known as hydrogen bonds.

Question 17

Which of the following is a distinguishing characteristic of living systems that allows them to maintain order despite overall positive entropy?

Accepted Answer

Energy

Question 18

Which cellular structure is responsible for protein modification in eukaryotic cells?

Accepted Answer

Golgi apparatus

Question 19

Which of the following statements about the O-H bond in water is correct?

Accepted Answer

The O-H bond distance is $$0.958\ 	ext{\AA}.$$

Question 20

Which of the following best explains why most enzymes in eukaryotic cells are compartmentalized?

Accepted Answer

To separate biological functions and increase efficiency

Principles of Biochemistry: The Cell and Water – Foundations for Life

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