Question 1

Which of the following best describes the difference between a covalent bond and a hydrogen bond?

Accepted Answer

A covalent bond involves the sharing of electron pairs between atoms, whereas a hydrogen bond is an intermolecular attraction between a partially positive hydrogen and a partially negative atom.

Question 2

Which property of water allows aquatic animals to survive in lakes during winter?

Accepted Answer

Water expands and floats when frozen, forming ice on the surface and insulating the water below

Question 3

Which feature of carbon allows for a great diversity of organic molecules?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 4

What determines the number of covalent bonds an atom can form?

Accepted Answer

The number of valence electrons in the outer shell

Question 5

Which of the following is a correct example of a functional group and its chemical property?

Accepted Answer

Amino group: basic and can accept a proton

Question 6

Which type of chemical reaction is responsible for joining monomers to form polymers?

Accepted Answer

Condensation (dehydration synthesis) reaction

Question 7

What is the name of the bond that links monosaccharides together in a polysaccharide?

Accepted Answer

Glycosidic linkage

Question 8

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

Phospholipids have both hydrophobic and hydrophilic regions, allowing them to form bilayers in water.

Question 9

Which of the following is NOT a function of proteins in biological systems?

Accepted Answer

Energy storage

Question 10

Which property of water is primarily responsible for its ability to dissolve many ionic compounds?

Accepted Answer

Water's polarity and ability to form hydrogen bonds

Question 11

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A sugar, a phosphate group, and a nitrogenous base

Question 12

Which of the following is a correct description of a buffer in biological systems?

Accepted Answer

A buffer is a substance that resists changes in pH by accepting or donating hydrogen ions.

Question 13

Which of the following is true about the secondary structure of proteins?

Accepted Answer

It involves hydrogen bonding between backbone atoms, forming alpha helices and beta sheets.

Question 14

Which of the following is a correct example of an intermolecular bond?

Accepted Answer

Hydrogen bond between water molecules

Question 15

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are not considered true polymers because their monomers are not connected in long chains.

Question 16

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

Breaking down a polysaccharide into monosaccharides by adding water

Question 17

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules require more energy to break, allowing water to absorb and retain heat.

Question 18

Which of the following is a correct description of an isomer?

Accepted Answer

Isomers are molecules with the same molecular formula but different structural arrangements.

Question 19

Which of the following best describes the role of nucleic acids in cells?

Accepted Answer

Nucleic acids store and transmit genetic information.

General Biology Exam 1 Study Guide: Chemistry and Biological Molecules

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