Biology Unit 3

Which functional group is both polar (hydrophilic) and weakly acidic?

-COOH

In sickle-cell disease, malformation of red blood cells is caused by only one error in the genetic code for hemoglobin.

True

True or False When starch is digested, water molecules are used to break the bonds holding the monosaccharide subunits together.

True

Which nitrogen-containing base is found in RNA but not in DNA?

uracil

What makes saturated triglycerides considerably less healthy than unsaturated ones?

They possess no double bonds between carbon atoms, which makes them more tightly packed together.

Amino acids are needed to build ________,just as ________ are needed to create DNA.

proteins; nucleotides

Which of the following is a functional group present in amino acids?

-NH 2

What functional group makes a carbohydrate hydrophilic?

-OH

Which of the following is an inorganic molecule?

COCl 2

How does DNA differ from RNA?

DNA is comprised of a double-strand; RNA is a single-strand.

True or False a polypeptide forms a beta pleated sheet or an alpha helix as its primary structure.

False

Is C 43H 64O 4 organic molecule or inorganic

Organic

Is H 2CO 3 an organic or inorganic molecule

Organic

Which of the following is true regarding the labeled plasma membrane?

Parts W and Z are hydrophilic.

Which of the following is a true statement about proteins?

Proteins are used to produce many types of hormones.

In which of the following is the correct monomer matched with its polymer?

amino acid - protein

A triglyceride is formed when three fatty acids join a glycerol by a

dehydration synthesis reaction.

A fatty acid that has double bonds is called

double bond

Which one of the following is a main function of proteins?

enzymatic activity

Humans store glucose in the form of

glycogen.

carbohydrates...

include glucose, sucrose, and starch

A saturated fat has

no double bonds.

ATP is a molecule used for energy transport inside the cell. The components of ATP are a nitrogen-containing base, a 5-carbon sugar, and three phosphate groups. Given this structure, ATP is classified as a(n)

nucleic acid

carbon and hydrogen atoms make a molecule

organic

Which of the following would describe a polypeptide?

amino acids joined by dehydration synthesis reactions

If a material mixes readily with water, it is identified as

hydrophilic.

Which of the following levels of protein folding would include shapes identified as helix and pleated sheet?

secondary structure

DNA functions to ________, while RNA's function is to________.

stores genetic information; aids in the processing of the information within the DNA into proteins.

Which of the following terms should be categorized separately from the others? muscle antibodies sucrose Correct answer enzymes hair

sucrose

How are lipids different from other categories of biological molecules?

they will not combine with water.

Which nitrogen-containing base is found in DNA but not in RNA?

thymine