Exam 2: The Molecules of Cells

The final shape of a protein is very important to its function. When proteins undergo an irreversible change in shape called ________ they ________ perform their usual functions.

Which type of bond formation is responsible for the properties of lipids?

The atomic mass of an element

Organic molecules

All carbohydrate molecules

The lower the pH

What type of reaction is necessary to produce a dipeptide from individual amino acids?

Removal of the sulfhydryl functional group would disrupt the structure of

Rain falling in the northeastern United States has a pH between 5.0 and 4.0. Normally, rainwater has a pH of about 5.6. Which of the following statements is correct?

Which of the following radioactive isotopes are used to detect whether or not an individual has a healthy thyroid?

Which of the following is a function of ATP within the cell?

A covalent bond is

Cholesterol is a component of cell membranes and is an example of which type of lipid?

Which of the following is a property of water that results from hydrogen bonding?

Enzymes are organic compounds classified as

Potassium hydroxide (KOH) almost completely dissociates in aqueous solution into K⁺ and OH^-, which means it is a(n)

In the search to discover the agents that cause mad cow disease, scrapie in sheep, and CJD and kuru in humans, diseased brain tissues were passed through a fine filter to remove bacteria. The filtrate was still infectious, indicating that something smaller than bacteria must be the causative agent. If a virus was responsible for these brain diseases, then the infectious agent would contain either RNA or DNA. Other possibilities were that the agent was a carbohydrate, fat, or protein. Tissue filtrates were treated with agents that destroyed just one of these chemicals and then injected into a healthy animal, with the results as follows. What is the infectious agent? •Amylase digests carbohydrates; tissue filtrate still infects healthy test animal. •Lipase digests fats; tissue filtrate still infects healthy test animal. •Formaldehyde and/or heat denatures DNA and RNA; tissue filtrate still infects healthy test animal. •Trypsin digests protein; tissue filtrate does not infect healthy test animal.

________ is a polysaccharide that is found in plant cell walls and accounts for their strength.

Which of the following molecules is inorganic?

Which statement about DNA and RNA is correct?