Question

I need the answers and a simple explanation, please :)

3. The main difference between saturated and unsaturated fatty acids is
(a) the amount of energy found in the fatty acid.
(b) saturated fatty acids are liquids.
(c) unsaturated fatty acids can be packed together very tightly.
(d) the number of hydrogen atoms bonded to the carbon atoms.

4. The function of proteins can include
(a) helping cells keep their shape.
(b) helping to destroy foreign substances.
(c) speeding up biochemical reactions.
(d) all of the above
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5. The characteristics of DNA includes which of the following?
(a) DNA is made of nucleotides consisting of a sugar, a phosphate group, and a carbon base
(b) DNA is made of a single polynucleotide chain, which winds into a double helix.
(c) DNA is how inherited characteristics are passed from one generation to the next.
(d) all of the above

6. Which category of organic compound is the major component of cell membranes?
(a) carbohydrate
(b) lipid
(c) protein
(d) nucleic acid

7. The cell wall of plants is made out of
(a) starch.
(b) glycogen
(c) cellulose
(d) chitin

Answer 1

3. (a) the amount of energy found in the fatty acid.

4. (d) all of the above

5. (c) DNA is how inherited characteristics are passed from one generation to the next.

6. (b) lipid

7. (c) cellulose

Step-by-step explanation:

3. Saturated fats have more energy due to the double bonds that are found in the molecules.

4. Different proteins have various and roles within the cell.

5. Each nucleotide, in turn, is made up of a nitrogenous base (not carbon base), a pentose sugar, and a phosphate. DNA is a double chain.

6. Biological membranes consist of a continuous double layer of lipid molecules in which membrane proteins are embedded.

7. The cell wall is composed of a network of cellulose microfibrils and cross-linking glycans embedded in a highly cross-linked matrix of pectin polysaccharides.