Question 1

Which of the following best explains why polar molecules are soluble in water, whereas non-polar molecules are not?

Accepted Answer

Polar molecules can form hydrogen bonds with water, while non-polar molecules cannot.

Question 2

A scientist is comparing the structure of a eukaryotic cell and a bacterial cell. Which feature is present in eukaryotes but absent in bacteria?

Accepted Answer

Membrane-bound organelles such as mitochondria

Question 3

Which molecule is produced as a byproduct when two amino acids form a peptide bond?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 4

Rank the following molecules from smallest to largest: ribosome, hemoglobin protein, viral particle, prokaryotic cell, mitochondria, red blood cell.

Accepted Answer

Ribosome \u003c hemoglobin protein \u003c viral particle \u003c mitochondria \u003c prokaryotic cell \u003c red blood cell

Question 5

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 6

Why are the two strands of DNA held together by hydrogen bonds instead of covalent bonds?

Accepted Answer

Hydrogen bonds allow the strands to separate easily during replication.

Question 7

Which atoms are required for the formation of a hydrogen bond?

Accepted Answer

Hydrogen and either oxygen, nitrogen, or fluorine

Question 8

A molecule is described as amphipathic. Which of the following best describes its properties?

Accepted Answer

It has both hydrophilic and hydrophobic regions.

Question 9

Which of the following is a correct example of an amphipathic molecule?

Accepted Answer

Phospholipid

Question 10

How does water interact with sodium chloride ($$\mathrm{NaCl}) $$when it dissolves?

Accepted Answer

Water molecules surround the ions, with oxygen facing $$\mathrm{Na^+}$$ and hydrogen facing $$\mathrm{Cl^-}.$$

Question 11

Which of the following best defines electronegativity?

Accepted Answer

The tendency of an atom to attract electrons towards itself in a chemical bond.

Question 12

Which of the following is NOT a structural difference between eukaryotic and bacterial cells?

Accepted Answer

Presence of ribosomes in both cell types

Question 13

Which of the following is a correct statement about the valence electrons of carbon, oxygen, and hydrogen?

Accepted Answer

Carbon has 4, oxygen has 6, hydrogen has 1 valence electron.

Question 14

Which bond links monomers together in proteins?

Accepted Answer

Peptide bond

Question 15

Where does polymerization of nucleotides into DNA occur in the cell?

Accepted Answer

Nucleus

Question 16

Which of the following is a correct example of a carbohydrate monomer and its polymer?

Accepted Answer

Glucose (monomer) and starch (polymer)

Question 17

A scientist is analyzing a molecule with both ionic and non-ionic regions. Which property is most likely observed?

Accepted Answer

The molecule is amphipathic and can interact with both water and lipids.

Question 18

Which of the following best describes the difference between proline and leucine?

Accepted Answer

Proline has a cyclic structure, while leucine has a straight-chain structure.

Question 19

Which bond links monomers together in nucleic acids?

Accepted Answer

Phosphodiester bond

Cell Biology Review Guidance: Structure, Molecules, and Cellular Differences

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