Question 1

Refer to the first image. What type of chemical bond is being formed between the large central atom and the two smaller atoms, and what property does this bond impart to the resulting molecule?

Accepted Answer

Polar covalent bond; it makes the molecule capable of hydrogen bonding

Question 2

In the second image, three long hydrocarbon chains are attached to a three-carbon backbone. What type of molecule is being formed, and what is the reaction called?

Accepted Answer

Triglyceride; dehydration synthesis

Question 3

The third image shows a circular structure formed by amphipathic molecules. What is this structure called, and what is its biological significance?

Accepted Answer

Micelle; aids in the digestion and absorption of lipids

Question 4

The fourth image depicts the joining of two monosaccharides with the release of water. What is this process called, and what type of bond is formed?

Accepted Answer

Dehydration synthesis; glycosidic bond

Question 5

The fifth image shows a highly branched polysaccharide. Which molecule is this, and what is its primary function in the human body?

Accepted Answer

Glycogen; energy storage

Question 6

The sixth image illustrates different levels of protein structure. Which level is characterized by alpha helices and beta sheets, and what type of bond stabilizes these structures?

Accepted Answer

Secondary; hydrogen bonds

Question 7

The seventh image shows a molecule with a nitrogenous base, a five-carbon sugar, and three phosphate groups. What is this molecule, and what is its primary cellular function?

Accepted Answer

ATP; provides energy for cellular processes

Question 8

Which of the following equations correctly represents the formation of a disaccharide from two monosaccharides?

Accepted Answer

$$C_6H_{12}O_6 + C_6H_{12}O_6 \rightarrow C_{12}H_{22}O_{11} + H_2O$$

Question 9

Which property of water allows it to form hydration spheres around ions, facilitating their dissolution in biological fluids?

Accepted Answer

Polarity

Question 10

A solution with a pH of 4 contains:

Accepted Answer

More hydrogen ions than hydroxide ions

Question 11

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

Accepted Answer

They lower the activation energy and are not consumed

Question 12

Which of the following is a correct statement about the chemical properties of an atom?

Accepted Answer

They are determined by the number of electrons in the outermost shell

Question 13

Which of the following best explains why humans can digest starch but not cellulose, even though both are polysaccharides of glucose?

Accepted Answer

Humans have enzymes that can break the linkages in starch but not in cellulose

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 15

Which of the following is a function of cholesterol in the human body?

Accepted Answer

It is a precursor for steroid hormones

Question 16

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

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 17

Which of the following best describes the process by which ATP releases energy for cellular work?

Accepted Answer

A covalent bond between phosphate groups is broken

Question 18

Which of the following is a correct pairing of a macromolecule and its building block?

Accepted Answer

Polysaccharide: monosaccharide

Question 19

Which of the following best describes the effect of Omega-3 unsaturated fats on cardiovascular health?

Accepted Answer

They have a positive effect on cardiovascular health

The Chemical Level of Organization: Bonds, Biomolecules, and Energy

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