Exam 2: The Chemical Basis of Life

Chemists describe ionic bonds as strong bonds while cell biologists consider them relatively weak bonds. This can be explained due to the fact that:

The process by which proteins and RNA form in an elastic conformation is known as:

RNA and DNA ALWAYS differ in the functional groups attached to: (Select all that apply)

Which group of plants have nitrogen fixing symbionts?

Which of the following is NOT a macromolecule formed by polymerization?

The two elements most likely to exhibit similar reactive properties are:

A molecule that is capable of releasing or donating a hydrogen ion is termed _______.

Which interaction is most important in enhancing the solubility of macromolecules in water?

TAP-tag mass spectrometry is a technique employed in the field of science best described as:

A pH shift from 10 to 8 creates a solution which is

You are working with an enzyme altase that you denature in the presence of urea. If altase were denatured no further by the addition of mercaptoethanol, what would that suggest to you about the enzyme?

Not all proteins are able to renature. When exposed to heat or some other denaturing treatment , some proteins are irreversibly denatured, while others can renature when the denaturant is removed. What is an example of a protein demonstrated to refold correctly?

Organic molecules are currently defined by which characteristic?

The main buffer system operating to maintain stable blood pH is made up of:

Which of these bonds results from an unequal sharing of electrons?

The low-molecular-weight building blocks of polymers are called _______.

Which statement does NOT support the theory that aging may occur in response to cellular damage by free radicals?

Proteins are often composed of two or more distinct modules that fold up independently of one another. They often represent parts of a protein that function in a semi-independent manner. These modules are called ______.

What level of structure in proteins is held together by R group interactions between different polypeptides?

If an organism lives in an environment where significant temperature fluctuations occur, and is capable of altering the fatty acid composition of its phospholipid bilayer, which of these choices would best allow membrane integrity to remain stable? (Select all that apply)