The type of macromolecule found in highest concentration on a weight basis in a HeLa cell is
protein.
lipid.
polysaccharide.
nucleic acid.
water
Co and Zn ions are required by humans in
a. microgram amounts.
b. gram or near gram amounts.
c. kilogram amounts.
. d. milligram amounts.
Which description best characterizes the length of a hydrogen bond between water molecules?
About the same length as the calculated van der Waals distance for two water molecules.
About the same length as a covalent O----H bond.
Shorter than a covalent O---H bond.
Longer than a covalent O---H bond, but shorter than the calculated van der Waals distance between water molecules.
Which of the following statements about water is not true?
Water will hydrogen bond into highly ordered structures or "cages" around non-polar molecules.
The electron-rich oxygen atom of one water molecule can interact with an electron-poor hydrogen on another water molecule to form a hydrogen bond.
Water is a key player in the energetics of the hydrophobic effect.
In an ice crystal water molecules pack into open lattices consisting of five-membered oxygen rings.
At 25 degrees celsius liquid water is about 85% as hydrogen bonded as the water in ice, with each molecule in an average of 3.4 hydrogen bonds.
Which of the following is the strongest?
Ionic interactions
Permanent dipole - permanent dipole interactions
London dispersion forces
Co-linear hydrogen bonds
Which of the following is the best explanation for the hydrophobic effect?
It is caused by the attraction of hydrophobic groups for each other.
It is an entropic effect caused by the tendency of hydrophobic groups to increase their entropy by associating with other hydrophobic groups.
It is an entropic effect, caused by the tendency of water molecules to increase their entropy by excluding hydrophobic groups, which they must otherwise surround with highly ordered structures.
It is caused by the attraction of water for hydrophobic groups.
It is an entropic effect, caused by the tendency of water molecules to increase their entropy by forming highly ordered structures around the hydrophobic groups.
Which of the following is NOT defined as a buffer? (pKa PIPES-H+ = 6.76; pKa MOPS-H+ = 7.15; pKa HEPES-H+ = 7.47)
0.15 M MOPS, pH 6.50
0.05 M HEPES-H+ / 0.04 M HEPES
0.20 M PIPES, pH 7.97
0.01 M HEPES, pH 7.30
The type of macromolecule found in highest concentration on a weight basis in a HeLa cell is
| protein. | |||||||||||||||||||||||||||
| lipid. | |||||||||||||||||||||||||||
| polysaccharide. | |||||||||||||||||||||||||||
| nucleic acid. | |||||||||||||||||||||||||||
| water Co and Zn ions are required by humans in
|
Which of the following statements about water is not true?
| Water will hydrogen bond into highly ordered structures or "cages" around non-polar molecules. | |||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||
| Water is a key player in the energetics of the hydrophobic effect. | |||||||||||||||||||||||||||||||||||||||||||
| In an ice crystal water molecules pack into open lattices consisting of five-membered oxygen rings. | |||||||||||||||||||||||||||||||||||||||||||
| At 25 degrees celsius liquid water is about 85% as hydrogen bonded as the water in ice, with each molecule in an average of 3.4 hydrogen bonds. Which of the following is the strongest?
|
Related textbook solutions
Related questions
Fill in the following chart with the appropriate subatomic particle and state whether each is located in the nucleus of the orbital
| Particle | Charge | Location (Nucleus or Orbital) |
| Positive (+) | ||
| Negative (-) | ||
| Neutral Charge |
Fill in the following chart using the lowercase letter of the statements below. Please be aware that some letters should be used more than once because they are true for more than one type of bond.
| Covalent Bonds | Ionic Bonds | Hydrogen Bonds |
Electrons are transferred from one atom to another atom
Valance electrons are shared between atoms
Involves positive and negative ions
A weak bond between 2 or more polar molecules
A bond between 2 or more atoms
The type of bond used to make NaCl (table salt)
The type of bond used to make CH4 (Methane)
What does it mean when a molecule is described as âpolar?â Be detailed in your answer.
State and explain two reasons that water molecules are essential to life because of their hydrogen bonds.
Fill in the chart with the missing information about macromolecules
| Macromolecule | Dietary source | Function | Example | Defining Characteristics |
| Carbohydrate | Cellulose and glucose | |||
| Lipid | Fats, Oils | |||
| Protein | ||||
| Nucleic Acid | Sardines, beans, spinach | Made of nucleotides (contain a base, sugar and phosphate) |
