Question 1

Refer to the first image. The water molecule is shown with a bond angle of 104.5°. What is the primary reason for this specific bond angle in water?

Accepted Answer

The repulsion between the lone pairs of electrons on the oxygen atom

Question 2

Based on the second and third images, what type of bond is responsible for the interaction between different water molecules?

Accepted Answer

Hydrogen bond

Question 3

Which property of water, illustrated in the second and third images, is most important for the transport of water in plants against gravity?

Accepted Answer

Cohesion due to hydrogen bonding

Question 4

The fourth and fifth images show the formation of disaccharides. What type of reaction is responsible for the formation of a glycosidic bond between two monosaccharides?

Accepted Answer

Condensation (dehydration synthesis) reaction

Question 5

In the fifth image, glucose and fructose combine to form sucrose. What is the byproduct of this reaction?

Accepted Answer

Water ($$H_2O)$$

Question 6

The sixth and seventh images show the formation of a fat molecule. What type of bond is formed between glycerol and fatty acids during this process?

Accepted Answer

Ester bond

Question 7

Refer to the eighth and ninth images. Which part of the phospholipid molecule is hydrophilic?

Accepted Answer

The phosphate group (head)

Question 8

The tenth image shows the general structure of an amino acid. Which group gives each amino acid its unique properties?

Accepted Answer

The R group (side chain)

Question 9

The eleventh image shows the formation of a peptide bond. What type of reaction forms a peptide bond between two amino acids?

Accepted Answer

Condensation (dehydration synthesis) reaction

Question 10

The twelfth and thirteenth images show secondary structures of proteins. What type of bond stabilizes both the alpha helix and beta sheet structures?

Accepted Answer

Hydrogen bonds

Question 11

The fourteenth to sixteenth images show a complex protein structure. What is the highest level of protein structure depicted here?

Accepted Answer

Quaternary structure

Question 12

The seventeenth image shows the structure of a nucleotide. Which component is responsible for the acidic nature of nucleic acids?

Accepted Answer

Phosphate group

Question 13

The eighteenth and nineteenth images show the structure of DNA and RNA. Which base is found in RNA but not in DNA?

Accepted Answer

Uracil

Question 14

The twentieth image shows the structure of tRNA. What is the main function of tRNA in the cell?

Accepted Answer

Transporting amino acids to the ribosome during protein synthesis

Chemical and Cellular Basis of Life: Biomolecules and Water

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