Test Unit 1: Chemistry of Life

Which of the following functional groups will you always find in an amino acid?

-NH2

If the mutation in the gene causes an amino acid deletion in the sequence of amino acids that make up nebulin, how will this affect the structure of nebulin?

The primary, secondary, and tertiary structures of nebulin will be affected

The structure of cysteine, an amino acid, can be seen to the right. Cysteine is one of only a few amino acids that contain sulfur. In which structural level of a protein would cysteine play the most significant role?

Secondary structure

An ionic bond occurs…

between two metals

Glucose serves as nutrients and fuel for cells. In which process is glucose used?

Cellular Respiration

Which fatty acid chain would most likely be found in the plasma membrane of an aquatic organism that lives in cold waters?

Fatty acid chain B because it is unsaturated, which allows for more flexibility in the membrane at cold temperatures.

Which of the following is the best explanation for why ice is less dense than liquid water?

Hydrogen bonds stabilize the structure of water keeping molecules separate from each, thus resulting in ice being less dense than water.

Stores hereditary information

nucleic acids

Compromises a major portion of the plasma membrane

lipids

plants use this macromolecules for storage

carbohydrates

function as antibodies to help protect the body from disease

proteins

monomers are bonded through phosphodiester linkages

nucleic acids

includes steroids

lipids

monomers come together through the formation of peptide bonds

proteins

… is the measure of how far a data set diverges from the central tendency

variability

…standard error increases confidence in the data

low

a low standard deviation means:

the independent variable is likely causing the changes

a water molecule has hydrogen bonds between the oxygen and both hydrogens. t or f

False

Which best describes the phenomenon seen in the picture at right? (cup with ice cubes and water)

Hydrogen bonds stabilize the structure of water keeping molecules separate from each, thus resulting in ice being less dense than water

Which of the following is responsible for the adhesive properties of water?

Hydrogen bonds between water molecules and other types of molecules

bond between water molecules

hydrogen bonds

… is when water absorbs heat and at night it releases heat, beneifitting marine life?

evaporative cooling

protein structure: polypeptide sequence joins

primary structure

protein structure: hydrogen bonds in backbone

secondary structure

protein structure: interactions of R-groups

tertiary structure

protein structures: polypeptides joining

Quaternary structure