AP Biology Ch 2 Quiz
(19).webp "AP Biology Ch 2 Quiz - Quiz")
This quiz is due Monday September 23rd by midnight that night.
- 1.
An ion with a charge of +2 would be....
- A.
H with one electron
- B.
C with six electrons
- C.
O with 8 electrons
- D.
Mg with 10 electrons
- E.
Does not describe any of these atoms
Correct Answer
D. Mg with 10 electronsExplanation
An ion with a charge of +2 would be Mg with 10 electrons. When an atom loses two electrons, it becomes positively charged, and in this case, it would have a charge of +2. Magnesium (Mg) normally has 12 electrons, but when it loses two electrons, it has 10 electrons remaining, resulting in a +2 charge.Rate this question:
-
- 2.
An ion with a charge of +1 would be....
- A.
H with one electron
- B.
C with six electrons
- C.
O with eight electrons
- D.
Mg with ten electrons
- E.
Does not describe any of these atoms
Correct Answer
E. Does not describe any of these atomsExplanation
The given options describe atoms with specific numbers of electrons, but none of them match an ion with a charge of +1. An ion with a charge of +1 would have one more proton than electrons, resulting in a positive charge. None of the options provided match this description, so the correct answer is "does not describe any of these atoms".Rate this question:
-
- 3.
Which one of the following is NOT a water property?
- A.
Hydrogen bonding
- B.
Surface tension
- C.
Capillary action
- D.
Nonpolar
Correct Answer
D. NonpolarExplanation
Nonpolar is not a water property because water is a polar molecule, meaning it has a slightly positive charge on one end and a slightly negative charge on the other. This polarity allows water molecules to form hydrogen bonds with each other, which gives water its unique properties such as high surface tension and capillary action. Nonpolar substances, on the other hand, do not have a separation of charges and do not readily interact with water molecules.Rate this question:
-
- 4.
Has only one proton, one neutron and one electron...
- A.
H with one electron
- B.
C with six electrons
- C.
O with eight electrons
- D.
Mg with ten electrons
- E.
Does not describe any of these atoms
Correct Answer
E. Does not describe any of these atomsExplanation
The given options describe the number of electrons in different atoms, but the question states that the atom has only one proton, one neutron, and one electron. None of the options match this description, so the answer is that it does not describe any of these atoms.Rate this question:
-
- 5.
Has 12 protons...
- A.
H with one electron
- B.
C with six electrons
- C.
O with eight electrons
- D.
Mg with ten electrons
- E.
Does not describe any of these atoms
Correct Answer
D. Mg with ten electronsExplanation
The given answer is "Mg with ten electrons." This is because magnesium (Mg) has an atomic number of 12, which means it has 12 protons in its nucleus. The number of electrons in an atom is equal to the number of protons, so magnesium should have 12 electrons. However, the statement in the question says that it has ten electrons, which is incorrect. Therefore, the answer is that the statement does not describe any of these atoms.Rate this question:
-
- 6.
The elements found in the greatest abundance in living organisms are
- A.
Carbon, hydrogen and nitrogen
- B.
Carbon, oxygen, hydrogen and neon
- C.
Carbon, oxygen, hydrogen and calcium
- D.
Carbon, oxygen, potassium and phosphorus
Correct Answer
A. Carbon, hydrogen and nitrogenExplanation
The correct answer is carbon, hydrogen, and nitrogen. These elements are found in the greatest abundance in living organisms because they are essential for the structure and function of biological molecules. Carbon is the backbone of organic compounds, such as carbohydrates, lipids, proteins, and nucleic acids. Hydrogen is present in water and organic molecules, and it participates in chemical reactions. Nitrogen is a key component of proteins and nucleic acids, which are crucial for cellular processes and genetic information. Therefore, these three elements are fundamental for the existence and functioning of living organisms.Rate this question:
-
- 7.
At least one double covalent bond is found in which of the following molecules? I. O2 II. CO2 III. MgCl2
- A.
I only
- B.
II only
- C.
III only
- D.
I and II only
- E.
I, II, and III
Correct Answer
D. I and II onlyExplanation
Oxygen molecule (O2) is made up of two oxygen atoms, each sharing two electrons to form a double covalent bond. Carbon dioxide (CO2) also contains a double covalent bond between the carbon atom and each of the oxygen atoms. However, magnesium chloride (MgCl2) does not have any double covalent bonds. Therefore, the correct answer is I and II only.Rate this question:
-
- 8.
Which of the following is an example of a polar covalent bond?
- A.
The bond between a hydrogen atom of one water molecule and an oxygen atom of an adjacent water molecule
- B.
The bond between a hydrogen atom and the oxygen atom of a water molecule
- C.
The bond between a hydrogen atom of a water molecule and a sodium ion in solution
- D.
The bond between a carbon atom and a hydrogen atom in a methane molecule
- E.
The bond between two methane molecules
Correct Answer
B. The bond between a hydrogen atom and the oxygen atom of a water moleculeExplanation
The bond between a hydrogen atom and the oxygen atom of a water molecule is an example of a polar covalent bond because oxygen is more electronegative than hydrogen, causing the oxygen atom to have a partial negative charge and the hydrogen atom to have a partial positive charge. This unequal sharing of electrons creates a polar bond.Rate this question:
-
- 9.
Hydroxyl group
- A.
-OH
- B.
-COOH
- C.
-C=O
- D.
-SH
- E.
-NH2
Correct Answer
A. -OHExplanation
The correct answer is -OH because a hydroxyl group is a functional group consisting of an oxygen atom bonded to a hydrogen atom. It is commonly found in alcohols and plays a crucial role in many chemical reactions. The other options listed (-COOH, -C=O, -SH, -NH2) represent different functional groups, but none of them match the structure of a hydroxyl group.Rate this question:
-
- 10.
Carbonyl group
- A.
-OH
- B.
-COOH
- C.
-C=O
- D.
-SH
- E.
-NH2
Correct Answer
C. -C=OExplanation
The correct answer is -C=O because the carbonyl group consists of a carbon atom double-bonded to an oxygen atom. This functional group is commonly found in various organic compounds, such as aldehydes, ketones, carboxylic acids, and esters. The -C=O group plays a crucial role in many chemical reactions and is responsible for the characteristic properties and reactivity of the compounds containing it.Rate this question:
-
- 11.
The molecule above could be classified as each of the following EXCEPT
- A.
A carboxylic acid
- B.
Thiol
- C.
Amine
- D.
Aldehyde
- E.
Ketone
Correct Answer
E. KetoneExplanation
The molecule above cannot be classified as a ketone because it does not have a carbonyl group (C=O) bonded to two other carbon atoms. Instead, it has a carboxyl group (COOH), which classifies it as a carboxylic acid.Rate this question:
-
- 12.
How does starch differ from cellulose?
- A.
Starch can form ring structures, but cellulose cannot
- B.
Cellulose is only found in plants, but starch is found in both plants and animals
- C.
Starch is a storage polysaccharide, but cellulose is a structural polysaccharide
- D.
Cellulose has nitrogen containing side chains that link it together to form strong fibers
- E.
Cellulose is a polymer of glucose, but starch is a polymer of sucrose
Correct Answer
C. Starch is a storage polysaccharide, but cellulose is a structural polysaccharideExplanation
Starch and cellulose differ in their functions within organisms. Starch is a storage polysaccharide, meaning it is used to store energy in plants and animals. On the other hand, cellulose is a structural polysaccharide, providing rigidity and strength to plant cell walls. This difference in function is due to their distinct chemical structures and arrangements. Starch can form ring structures, while cellulose cannot. Additionally, cellulose is only found in plants, whereas starch is found in both plants and animals.Rate this question:
-
- 13.
All of the following could be present in a phospholipid molecule EXCEPT
- A.
A saturated fatty acid
- B.
Phosphate
- C.
A hydrophilic head
- D.
Three unsaturated fatty acids
- E.
Glycerol
Correct Answer
D. Three unsaturated fatty acidsExplanation
A phospholipid molecule consists of a hydrophilic head, a phosphate group, a glycerol backbone, and two fatty acid tails. The fatty acid tails can be either saturated or unsaturated, but the question asks for an exception. Therefore, the correct answer is "three unsaturated fatty acids" because a phospholipid molecule typically has two fatty acid tails, not three.Rate this question:
-
- 14.
Saturated fatty acids
- A.
Have many polar bonds along their length
- B.
Are bent
- C.
Are the main reason oils are liquids
- D.
Have less hydrogen than unsaturated fatty acids
- E.
Will cause a fat to have a higher melting point than if its fatty acids were unsaturated
Correct Answer
E. Will cause a fat to have a higher melting point than if its fatty acids were unsaturatedExplanation
Saturated fatty acids have a higher melting point compared to unsaturated fatty acids because they have a straight, rigid structure with no double bonds. This allows them to pack tightly together, resulting in stronger intermolecular forces and a higher melting point. Unsaturated fatty acids, on the other hand, have double bonds that introduce kinks in their structure, preventing them from packing tightly and leading to weaker intermolecular forces and a lower melting point.Rate this question:
-
- 15.
The molecule above is
- A.
A pentose
- B.
A monosaccharide
- C.
Water soluble
- D.
A only
- E.
A and c
- F.
A, b and c
Correct Answer
F. A, b and cExplanation
The molecule above is a pentose because it has five carbon atoms. It is also a monosaccharide because it is a simple sugar that cannot be further hydrolyzed. Additionally, it is water-soluble because it can dissolve in water. Therefore, the correct answer is a, b, and c.Rate this question:
-
.JPG "The molecule above could be classified as each of the following EXCEPT")
Back to top