Question

1. 4a. Three molecules of fatty acid joined to one molecule of glycerol constitute a molecule of

1. wax
2. fat
3. oil
4. steroid

2. 4b. In the double helix structure of nucleic acids, guanine hydrogen-bonds to

1. uracil
2. thymine
3. adenine
4. cytosine

3. 4c. The alpha helix structure of proteins is stabilized by what type of interaction?

1. nonpolar covalent bonds
2. hydrogen bonds
3. polar covalent bonds
4. ionic interactions

4. 4d. Which of the following lists the components of a nucleotide?
   1. phosphate, five-carbon sugar, nitrogenous base
   2. peptide, amino acid, glycerol
   3. phosphate, ribose, amino acid
   4. phosphate, deoxyribose, phospholipid

5. 4e. Which of the following is true concerning saturated fatty acids?
   1. They have double bonds between the carbon atoms of the fatty acids.
   2. They have a higher ratio of hydrogen       to carbon than unsaturated         fats.
   3. They are usually liqt1id at room temperature.
   4. They are usually produced by plants.

6. 4f. Which of the following is not a characteristic of the DNA molecule?
   1. contains deoxyribose sugar
   2. possesses thymine instead of uracil
   3. is single stranded
   4. is typically located in the nucleus

7. 4g. Which statement is not true of cholesterol?
   1. It is synthesized from fatty acids.
   2. It has no beneficial uses in the human body.
   3. High blood cholesterol levels are associated with the condition atherosclerosis.
   4. It is classified as a steroid

Answer 1

4a) answer is b. Because in Fat 3 molecule of fatty acids joined to one molecule of glycerol by 3 ester bonds

4b) In double helix structure of nucleic acid, Guanine hydrogen bond to (d) Cytosine by 3 hydrogen bond and Thymine bond to Adenine by 2 hydrogen bond.

4c) The alpha helix of protein structure is stabilized by (b) Hydrogen bond.

4d) Nucleotide=(a) phosphate+ five-carbon sugar+nitrogenous base

4e) Saturated fatty acids:-(b)They have a higher ratio of hydrogen to carbon than unsaturated fats.

4f) (c) DNA is always double stranded not single stranded.

4.g) (b)has no beneficial uses in the human body is option is not true for cholesterol. Because cholesterol play many important role in body like Regulate membrane fluidity, hormone synthesis, vitamin D synthesis.