Cumulative Exam

Which is found in both RNA and DNA?

• uracil

• ribose sugar

• phosphate group

• deoxyribose sugar

Which characteristic can best distinguish between two different

proteins?

• the presence of nitrogen in the proteins

• the sequence of amino acids in the proteins

• the number of amino acids found in the proteins

• the location of the peptide bonds in the proteins

Pepsin is a digestive enzyme that works most effectively in very

acidic environments, such as the stomach. What is most likely

the effect antacids have on the enzyme pepsin?

• Pepsin will work less effectively.

• Pepsin will work more effectively.

• Pepsin will increase in temperature.

• Pepsin will decrease in temperature.

How do enzymes most affect the rate of biochemical reactions in

the human body?

• They decrease the activation energy required.

• They increase the amount of products created.

• They decrease the amount of reactants needed.

• They increase the temperature of the substrate.

Examine the diagram of the Amoeba. The feature identified by the arrow is an adaptation for which

function?

• storing food

• movement

• detecting light

• pumping out excess water

Which organelle found in a paramecium would help the organism

obtain food?

• cilia

• muscle

• ribosome

• contractile vacuole

A researcher is studying the effects of second-hand smoke on

unborn fetuses, and finds that fetuses of mothers who smoke are

more likely to have birth defects than the fetuses of non-smoking

mothers. What is most likely the cause of the birth defects?

• environmental genetic mutation

• incorrect replication of the DNA

• a breakdown during protein synthesis

• genetic pre-disposition for birth defects

While experimenting on some mouse cells, a scientist exposes

the cells to radiation. What is the most likely outcome of the

radiation exposure?

• mutations

• cell growth

• daughter cells

• cell movement

What aspect of a cell has the greatest impact on its function?

• nutrition

• structure

• organelles present

• ability to reproduce

Which original information to direct life functions is found in all

cells of multicellular organisms?

• DNA

• RNA

• proteins

• enzyme