Question 1

Which property of water allows trees to transport water from their roots to their leaves against gravity?

Accepted Answer

Cohesion, which is water molecules sticking to each other via hydrogen bonds

Question 2

A sodium atom ($$Na) $$reacts with a chlorine atom ($$Cl) to $$form sodium chloride ($$NaCl). $$What type of bond is formed between $$Na$$ and $$Cl$$?

Accepted Answer

Ionic bond

Question 3

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

The oxygen atom is more electronegative, causing an unequal sharing of electrons

Question 4

Which of the following is a consequence of water's high specific heat for living organisms?

Accepted Answer

Water resists temperature changes, helping organisms maintain homeostasis

Question 5

Which chemical interaction is responsible for the ability of geckos to climb walls?

Accepted Answer

Van der Waals interactions

Question 6

A molecule of methane ($$CH_4) is $$formed when carbon shares electrons equally with four hydrogen atoms. What type of bond is present in $$CH_4$$?

Accepted Answer

Nonpolar covalent bond

Question 7

Which of the following statements about hydrogen bonds is TRUE?

Accepted Answer

Hydrogen bonds occur between a hydrogen atom and a more electronegative atom

Question 8

Which formula correctly represents the ratio of carbon, hydrogen, and oxygen atoms in carbohydrates?

Accepted Answer

$$C:H:O = 1:2:1$$

Question 9

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 10

Which property of water is most important for maintaining the structure of biological macromolecules?

Accepted Answer

Water's ability to form hydrogen bonds

Question 11

A scientist is studying the folding of a protein. Which level of protein structure is primarily determined by hydrogen bonding between backbone atoms?

Accepted Answer

Secondary structure

Question 12

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids contain double bonds, causing kinks in the chain

Question 13

Which of the following is a polymer formed from nucleotide monomers?

Accepted Answer

DNA

Question 14

Which type of chemical bond is responsible for the formation of water ($$H_2O) $$molecules?

Accepted Answer

Polar covalent bond

Question 15

A solution contains 0.5 moles of solute in 1 liter of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$M = 0.5 \text{ mol/L}$$

Question 16

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water

Question 17

Which macromolecule is primarily responsible for storing and transmitting genetic information?

Accepted Answer

Nucleic acids

Question 18

Which of the following is a real-world example of a chemical reaction involving the breaking of bonds?

Accepted Answer

Photosynthesis, where water molecules are split to release oxygen

Question 19

Which of the following is TRUE about the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein

Question 20

Which of the following best describes the role of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts, speeding up chemical reactions by lowering activation energy

Unit 1: Chemistry of Life – Structure of Water, Hydrogen Bonding, and Chemical Bonds

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