Question

1.histones are proteins that make up nucleosomes. they bind to the backbone of DNA in chromosomes. A majority of the residues in these proteins must be ___ for this to occur

a) hydrophobic

b) neg charged

c)hydrophilic and neutral

d)pos charged

e)cytseines

2. the stability of a protein secondary structure is mostly due to

a) the hydrogen bonding between the amide groups within the backbone of the protein

b) the attraction for water molecules by hydrophobic amino acid residues

c) the repulsion of water molecules by the hydrophobic amino acid residues

d) the number of disulfide bonds in the protein

e) the absence of charged amino acids resides

3.during heavy exercise muscle tissue can undergo anaerobic metabolism to produce lactase. what is the fate of this lactate

a) it is converted back to pyruvate for gluconeogenesis in the muscle

b) it is transported to the liver for gluconeogenesis to produce glucose

c) it is converted to acetyl-coA for the production of amino acids for protein production

d) it is used as a carbon source for the synthesis of amino acids for protein production

e) it is stored in the muscle tissue until oxygen rise and it can be used by the TCA cycle

4. all these compounds represent direct metabolites of pyruvate except

a) acetyl-CoA

b)alanine

c)glutamate

d)lactate

e)oxaloacetate

Answer 1

Answer

1. Histones are proteins that makeup nucleosomes. they bind to the backbone of DNA in chromosomes. A majority of the residues in these proteins must be pos charged for this to occur. So, option d is the right answer.

2. Option a is the right answer the secondary structure of the protein most stabilized by the hydrogen bonding between the amide groups within the backbone of the protein.

3. Option b is the right answer as lactate produced during anaerobic respiration goes back to the liver where it converts into glucose by the process of gluconeogenesis which is also known as the Cori cycle.

4. Option C is the right answer.