©JASONMcCONNELL 2025 ALL RIGHTS RESERVED
BIO 121 Final Exam Questions and Answers
100% Pass -Montgomery County
Community College
In 6C6H12O6 there are ________ oxygen atoms? - ANS 36
The molecular mass of Na2CO3 is... - ANS 106
In the equation 2H2 + 02 ---> 2H2O....
A. H2, O2, and H2O are all compounds
B. H2, O2, and H2O are all elements
C. Only H2 and O2 are compounds
D. Only H2O is a compound - ANS D. Only H2O is a compound
The tendency of water molecules to stick with another molecule other than water is.... -
ANS Adhesion
Which is less dense, solid water or liquid water? - ANS Liquid water-the molecules can fit
closer together because they are breaking and reforming, unlike ice molecules
pH of 3 is how many times more acidic than pH of 6? - ANS 1000x more
1
, ©JASONMcCONNELL 2025 ALL RIGHTS RESERVED
Covalent Bonds - ANS share electrons
Ionic Bonds - ANS accept electrons
What does the body NOT break down for energy? - ANS RNA
3 most common atoms in our body - ANS hydrogen, oxygen, and carbon
Which of the following contains a carboxyl group and an amino group?
A. Amino acid
B. Fat
C. Sugar
D. Vinegar - ANS A. Amino acid
Which of the following statements about dehydration synthesis (condensation) is FALSE?
A. One monomer loses hydrogen atoms, other hydroxyl group
B. H2O is formed as the monomers are joined
C. Covalent bonds are formed between monomers
D. Animal digestive systems utilize to break down food - ANS D. Animal digestive systems
utilize to break down food
An oil may be converted into a substance that is solid at room temperature by - ANS adding
hydrogen, decreasing the number of double bonds in molecules
Fatty acids with double bonds between some of their carbons are said to be -
ANS unsaturated
2
, ©JASONMcCONNELL 2025 ALL RIGHTS RESERVED
Primary structure of a protein is - ANS the amino acid sequence of the polypeptide chain
Which of the following are false about nucleotides?
A. Nucleotides contain lipids
B. Nucleotides contain sugar molecules
C. Nucleotides can be linked together to form nucleic acids
D. Nucleotides contain nitrogenous bases - ANS A. Nucleotides contain lipids
A molecule with the formula C18H32O16 is a - ANS polypeptide
Monosaccharides ratio - ANS 1:2:1
Ex. Glucose C6H12O2
Isomers are - ANS molecules that have the same molecular formula
Disaccharide are - ANS 2 monosaccharides together with condensation reaction (H2O is
taken out)
Hydrolysis reaction is - ANS adding water
Polysaccharides are - ANS Disaccharides + monosaccharides
also hydrophilic
Nucleoid region of prokaryotic cell - ANS contains the cells of DNA
Function of nucleoulus is... - ANS to manufacture ribosomal RNA
3
BIO 121 Final Exam Questions and Answers
100% Pass -Montgomery County
Community College
In 6C6H12O6 there are ________ oxygen atoms? - ANS 36
The molecular mass of Na2CO3 is... - ANS 106
In the equation 2H2 + 02 ---> 2H2O....
A. H2, O2, and H2O are all compounds
B. H2, O2, and H2O are all elements
C. Only H2 and O2 are compounds
D. Only H2O is a compound - ANS D. Only H2O is a compound
The tendency of water molecules to stick with another molecule other than water is.... -
ANS Adhesion
Which is less dense, solid water or liquid water? - ANS Liquid water-the molecules can fit
closer together because they are breaking and reforming, unlike ice molecules
pH of 3 is how many times more acidic than pH of 6? - ANS 1000x more
1
, ©JASONMcCONNELL 2025 ALL RIGHTS RESERVED
Covalent Bonds - ANS share electrons
Ionic Bonds - ANS accept electrons
What does the body NOT break down for energy? - ANS RNA
3 most common atoms in our body - ANS hydrogen, oxygen, and carbon
Which of the following contains a carboxyl group and an amino group?
A. Amino acid
B. Fat
C. Sugar
D. Vinegar - ANS A. Amino acid
Which of the following statements about dehydration synthesis (condensation) is FALSE?
A. One monomer loses hydrogen atoms, other hydroxyl group
B. H2O is formed as the monomers are joined
C. Covalent bonds are formed between monomers
D. Animal digestive systems utilize to break down food - ANS D. Animal digestive systems
utilize to break down food
An oil may be converted into a substance that is solid at room temperature by - ANS adding
hydrogen, decreasing the number of double bonds in molecules
Fatty acids with double bonds between some of their carbons are said to be -
ANS unsaturated
2
, ©JASONMcCONNELL 2025 ALL RIGHTS RESERVED
Primary structure of a protein is - ANS the amino acid sequence of the polypeptide chain
Which of the following are false about nucleotides?
A. Nucleotides contain lipids
B. Nucleotides contain sugar molecules
C. Nucleotides can be linked together to form nucleic acids
D. Nucleotides contain nitrogenous bases - ANS A. Nucleotides contain lipids
A molecule with the formula C18H32O16 is a - ANS polypeptide
Monosaccharides ratio - ANS 1:2:1
Ex. Glucose C6H12O2
Isomers are - ANS molecules that have the same molecular formula
Disaccharide are - ANS 2 monosaccharides together with condensation reaction (H2O is
taken out)
Hydrolysis reaction is - ANS adding water
Polysaccharides are - ANS Disaccharides + monosaccharides
also hydrophilic
Nucleoid region of prokaryotic cell - ANS contains the cells of DNA
Function of nucleoulus is... - ANS to manufacture ribosomal RNA
3
