Exam 2 Clicker Questions Flashcards
The function of nucleotides in the cell is:
- to provide energy for cellular processes
- to provide building blocks for nucleic acids
The function of nucleotides in the cell is:
- to provide energy for cellular processes
- to provide building blocks for nucleic acids
What is responsible for holding the two strands of together in the DNA double helix?
hydrogen bonds
If 10 glucose molecules (C6H12O6) were linked by condensation reactions….How many oxygen atoms would be found in this polymer?
51
If you were to grab the ends of any of the polysaccharides listed below, which would you be able to stretch the most?
amylose
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?
this carbohydrate is likely to be acting as some sort of signal to other cells
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)
you would see two distinct and separate phases
What do you predict would happen if you added a fatty acid and a hydrophobic substance to water in a beaker and mixed vigorously?
both the fatty acid and the hydrophobic substance are insoluble in water and form layers at the top and bottom of the beaker
Adding hydrogen atoms to fatty acid tails of a triglyceride containing double bonds would:
increase the triglyceride’s melting temperature
Which of the following is NOT a function of lipids in the cell?
information storage
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”)?
membrane containing lipids with unsaturated fatty acids
Which of the following lists of lipids is properly arranged according to amphipathicity (from lowest to highest)?
triglyceride, cholesterol, phosphatidylcholine
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?
- 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.
What is responsible for holding the two strands of together in the DNA double helix?
hydrogen bonds
If 10 glucose molecules (C6H12O6) were linked by condensation reactions….How many oxygen atoms would be found in this polymer?
51
If you were to grab the ends of any of the polysaccharides listed below, which would you be able to stretch the most?
amylose
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?
this carbohydrate is likely to be acting as some sort of signal to other cells
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)
you would see two distinct and separate phases
What do you predict would happen if you added a fatty acid and a hydrophobic substance to water in a beaker and mixed vigorously?
both the fatty acid and the hydrophobic substance are insoluble in water and form layers at the top and bottom of the beaker
Adding hydrogen atoms to fatty acid tails of a triglyceride containing double bonds would:
increase the triglyceride’s melting temperature
Which of the following is NOT a function of lipids in the cell?
information storage
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”)?
membrane containing lipids with unsaturated fatty acids
Which of the following lists of lipids is properly arranged according to amphipathicity (from lowest to highest)?
triglyceride, cholesterol, phosphatidylcholine
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?
- 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.
