Exam 2 Clicker Questions

Question 1

The function of nucleotides in the cell is:

Answer 1

• to provide energy for cellular processes

- to provide building blocks for nucleic acids

Question 2

The function of nucleotides in the cell is:

Answer 2

• to provide energy for cellular processes

- to provide building blocks for nucleic acids

Question 3

What is responsible for holding the two strands of together in the DNA double helix?

Answer 3

hydrogen bonds

Question 4

If 10 glucose molecules (C6H12O6) were linked by condensation reactions….How many oxygen atoms would be found in this polymer?

Answer 4

51

Question 5

If you were to grab the ends of any of the polysaccharides listed below, which would you be able to stretch the most?

Answer 5

amylose

Question 6

You have discovered a previously unstudied carbohydrate. You determine that it normally resides on the outside surface of the cell membrane. You also notice that it is often attached to a poly peptide. What hypothesis would be most consistent with these observations?

Answer 6

this carbohydrate is likely to be acting as some sort of signal to other cells

Question 7

What would happen to a 1:1 mixture of a triglyceride and water if it were shaken and allowed to sit for a few minutes? (Note: this triglyceride has a low melting point so will be liquid at room temperature)

Answer 7

you would see two distinct and separate phases

Question 8

What do you predict would happen if you added a fatty acid and a hydrophobic substance to water in a beaker and mixed vigorously?

Answer 8

both the fatty acid and the hydrophobic substance are insoluble in water and form layers at the top and bottom of the beaker

Question 9

Adding hydrogen atoms to fatty acid tails of a triglyceride containing double bonds would:

Answer 9

increase the triglyceride’s melting temperature

Question 10

Which of the following is NOT a function of lipids in the cell?

Answer 10

information storage

Question 11

Compare a membrane composed primarily of lipid molecules with saturated fatty acids to one with lipids having unsaturated fatty acid tails. Which type of membrane do you predict would be more fluid (less “gelled”)?

Answer 11

membrane containing lipids with unsaturated fatty acids

Question 12

Which of the following lists of lipids is properly arranged according to amphipathicity (from lowest to highest)?

Answer 12

triglyceride, cholesterol, phosphatidylcholine

Question 13

Given what you know about ALL the chemical properties and structure of the lipid bilayer and proteins, which of the following proteins would you expect to find associated with the membrane?

Answer 13

• a globular protein with nonpolar amino acid chains folded into the interior of the protein and hydrophilic side chains exposed to water
• a protein with a stretch of ~20-30 consecutive hydrophobic amino acids
• a protein with multiple stretches of ~20-30 (consecutive) alternating hydrophilic and hydrophobic amino acids.

Question 14

What is responsible for holding the two strands of together in the DNA double helix?

Answer 14

hydrogen bonds

Question 15

If 10 glucose molecules (C6H12O6) were linked by condensation reactions….How many oxygen atoms would be found in this polymer?

Answer 15

51

Question 16

If you were to grab the ends of any of the polysaccharides listed below, which would you be able to stretch the most?

Answer 16

amylose

Question 17

You have discovered a previously unstudied carbohydrate. You determine that it normally resides on the outside surface of the cell membrane. You also notice that it is often attached to a poly peptide. What hypothesis would be most consistent with these observations?

Answer 17

this carbohydrate is likely to be acting as some sort of signal to other cells

Question 18

What would happen to a 1:1 mixture of a triglyceride and water if it were shaken and allowed to sit for a few minutes? (Note: this triglyceride has a low melting point so will be liquid at room temperature)

Answer 18

you would see two distinct and separate phases

Question 19

What do you predict would happen if you added a fatty acid and a hydrophobic substance to water in a beaker and mixed vigorously?

Answer 19

both the fatty acid and the hydrophobic substance are insoluble in water and form layers at the top and bottom of the beaker

Question 20

Adding hydrogen atoms to fatty acid tails of a triglyceride containing double bonds would:

Answer 20

increase the triglyceride’s melting temperature

Question 21

Which of the following is NOT a function of lipids in the cell?

Answer 21

information storage

Question 22

Compare a membrane composed primarily of lipid molecules with saturated fatty acids to one with lipids having unsaturated fatty acid tails. Which type of membrane do you predict would be more fluid (less “gelled”)?

Answer 22

membrane containing lipids with unsaturated fatty acids

Question 23

Which of the following lists of lipids is properly arranged according to amphipathicity (from lowest to highest)?

Answer 23

triglyceride, cholesterol, phosphatidylcholine

Question 24

Given what you know about ALL the chemical properties and structure of the lipid bilayer and proteins, which of the following proteins would you expect to find associated with the membrane?

Answer 24

• a globular protein with nonpolar amino acid chains folded into the interior of the protein and hydrophilic side chains exposed to water
• a protein with a stretch of ~20-30 consecutive hydrophobic amino acids
• a protein with multiple stretches of ~20-30 (consecutive) alternating hydrophilic and hydrophobic amino acids.