Unit 2 - AP Bio

Which diagram best illustrates the interactions between water molecules? a. A b. B c. C d. D

B

Which diagram represents the polarity of a water molecule? a. A b. B c. C d. D

B

Which of the following substances are organic? I. Phospholipids II. Oxygen III. Carbon dioxide

I. Phospholipids

Allen pours water into a graduated cylinder. He notices that the surface of the water is curved, as shown below. Which of the following identifies this phenomenon and explains how it is formed? a. The curved surface is a convex meniscus which has formed because of surface tension. b. The curved surface is a concave meniscus which has formed because of capillary action. c. The curved surface is a concave meniscus which has formed because of surface tension. d. The curved surface is a convex meniscus which has formed because of capillary action.

The curved surface is a concave meniscus which has formed because of capillary action.

How many monosaccharides are in a disaccharide? a. 2 b. 3 c. 1 d. 4

a. 2

How many different amino acids are universal to all living organisms? a. 20 b. 11 c. 9 d. 17

a. 20

Which property of water would allow bugs to float on water? a. Cohesion b. Adhesion c. Thermal d. Solubility

a. Cohesion

Which describes these molecules correctly? a. I. Carbohydrate, II. Lipid b. I. Carbohydrate, II. Protein c. I. Protein, II. Lipid d. I. Lipid, II. Carbohydrate

a. I. Carbohydrate, II. Lipid

Water striders are insects that have the ability to walk across the surface of water. Which properties of water allow the water strider to do this? a. Surface tension b. Capillary action c. Specific heat d. Adhesion

a. Surface tension and d. Adhesion

Which statement about water is correct? Selected: a. Water molecules are polar, therefore fatty acids do not dissolve.This answer is correct. b. Water has a low heat capacity allowing enzymatic reactions to happen at a wide range of temperatures. c. Ice has a higher density than liquid water, therefore some organisms can live under the ice. d. The atoms within a molecule of water are held together by hydrogen bonds.

a. Water molecules are polar, therefore fatty acids do not dissolve.

Which of the following is a polymer of a chain of protein monomers? a. polypeptide b. cellulose c. monoglyceride d. DNA

a. polypeptide

What type of fat is considered to be unhealthy? a. trans b. polyunsaturated c. monounsaturated d. fiber

a. trans

Which two fatty acids are more similar in shape? a. trans and saturated b. unsaturated and trans c. poly and saturated d. saturated and unsaturated

a. trans and saturated

What does hydrophillic mean? a. water loving b. water fearing c. water passive d. water active

a. water loving

Water is able to travel against gravity, from the roots of a plant to the leaves at the top of the plant. Which of the following processes best explains the movement of water in this phenomenon? a. Capillary action, which occurs when the cohesive forces are stronger than the adhesive forces b. Capillary action, when adhesive forces are stronger than cohesive forces. c. Surface tension, which occurs when the cohesive forces are stronger than the adhesive forces. d. Surface tension, when the adhesive forces are stronger than the cohesive forces.

b. Capillary action, when adhesive forces are stronger than cohesive forces.

Which of the following are connected by hydrogen bonds? a. Phosphate to sugar in a DNA molecule Selected: b. Hydrogen to oxygen between two different molecules of waterThis answer is correct. c. Hydrogen to oxygen within a molecule of water d. Base to sugar in a DNA molecule

b. Hydrogen to oxygen between two different molecules of water

Which describes these molecules correctly?

b. I. carbohydrate & II. lipid

Which of the following statements is true about covalent bonds? a. It is characteristic of all organic molecules. b. It is formed by the sharing of equal numbers of electrons by two atoms. c. It only happens with carbon atoms. d. It is formed by the exchange of equal numbers of electrons by two atoms.

b. It is formed by the sharing of equal numbers of electrons by two atoms.

What type of bonds are formed between the amine and carboxylic acid groups of adjacent amino acids? a. Hydrogen Bond b. Peptide Bond c. Carboxyl Bond d. Ionic Bond

b. Peptide Bond

Where one part of water molecules is partially negative and the other is partially positive is called a. Bonding Selected: c. Charged d. Nonpolar

b. Polarity

Water's high specific heat allows it to be a __________ environment for marine organisms. a. Unstable b. Stable c. Corrosive d. Acidic

b. Stable

Which chemical is shown in the diagram below? a. Monosaccharide b. Unsaturated fatty acid c. Triglyceride d. Saturated fatty acid

b. Unsaturated fatty acid

What type of protein structure are represented in the diagram? Image result for alpha helix and beta sheet a. lambda coils and delta groups b. alpha helices and beta sheets c. double helix and transverse d. Retro turns and Inverse pleats

b. alpha helices and beta sheets

What element is considered the building block of life? a. water b. carbon c. nitrogen d. oxygen

b. carbon

What three key polymers can be made from glucose monosaccharides? a. polypeptides, fatty acids, and lipids b. cellulose, glycogen, and starch c. ribose, lysine, and leucine d. lactose, ribose, and vascular chains

b. cellulose, glycogen, and starch

Hydrogen bonds result in the atoms invovled forming a _____. a. non polar subatance b. polar substance c. oxidation reaction d. redox reaction

b. polar substance

What is a difference between cohesion and adhesion? a. Only cohesion is involved in the movement of water in soil. b. Only cohesion involves the interaction of water with soil mineral particles. Selected: c. Only adhesion is involved in the capillary action of a plants xylem.This answer is correct. d. Only adhesion is involved in transpiration pull.

c. Only adhesion is involved in the capillary action of a plants xylem.

Which of the following describes surface tension in water? a. Surface tension occurs due to ionic bonding. b. Surface tension is caused by water molecules repelling one another. c. Surface tension allows water to support small objects if they are placed carefully on its surface. d. Surface tension of water is weakened by hydrogen bonding.

c. Surface tension allows water to support small objects if they are placed carefully on its surface.

Blood is a water-based transport medium. Which property of water makes it a good transport medium? a. High specific heat b. Transparency Selected: c. Versatility as a solventThis answer is correct. d. It has its greatest density at 4°C

c. Versatility as a solvent

How many molecules of water are required to completely hydrolyse a polypeptide made up of 23 amino acids? a. 44 b. 23 c. 11 d. 22

d. 22

What is denaturation? a. The process by which amino acids are broken down and ammonia is released b. A change in the amino acid sequence of a protein causing a disruption of its 3D shape c. A change in the genetic code of an organism d. A structural change of a protein that results in the loss of its biological properties

d. A structural change of a protein that results in the loss of its biological properties

Amino acids all share a common basic structure, with a central carbon atom bound to I. An amine group (NH2) II. A carboxylic acid group (COOH) III. A ribose amino acid atom (R) a. I and II b. I and III c. II and III d. I, II and III

d. I, II and III

What type of monomer is represented in the diagram below? a. Amino Acid b. Carbohydrate c. Polymer d. Nucleic Acid

d. Nucleic Acid

Which of the following scenarios is an example of cohesion? a. Water sticks to the walls of blood vessels. b. Water molecules stay on the tip of a pine needle because the water is attracted to the surface of the needle. c. Water molecules stick to the surface of a mirror. d. Water molecules stick to one another and form a bead.

d. Water molecules stick to one another and form a bead.