Question

1. why is atp categorized as a nucleic acid: a. atp has a polar region and a nonpolar region b. atp contains four fused carbon rings c. atp is a modified nucleotide with three phosphate groups, ribose, and adenine d. all nucleic acids, such as atp, function as catalysts to increase reaction rates e. all nucleic acids have an amine and an acid functional group 24. which of the following statements about enzymes is true: a. they are carbohydrates b. they are stable at high temperatures c. they are biological catalysts d. they are not reusable e. they are required in large amounts in order to be effective 25. the most common steroid is: a. phospholipid b. cholesterol c. triglyceride d. trans fat e. unsaturated fat 26. glycogen is the storage form of ____ in animals. a. protein b. lipids c. amino acids d. glucose e. dna 27. shell 1 of an atom can hold a maximum of ____ electron(s). a. 1 b. 2 c. 4 d. 8 e. 18 28. which of these substances is an enzyme: a. glucose b. triglyceride c. oxidase d. nucleotide e. omega - 3 fatty acid

Explanation:

• Question 23: ATP (adenosine - triphosphate) is a modified nucleotide with three phosphate groups, ribose, and adenine, which is why it can be related to nucleic - acids. Nucleic acids are polymers of nucleotides.
• Question 24: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are usually proteins (although some RNA molecules can also act as enzymes), are not stable at high temperatures (they denature), are reusable, and are effective in small amounts.
• Question 25: Cholesterol is the most common steroid. Steroids have a characteristic four - ring structure, and cholesterol is an important component of cell membranes and a precursor for many other steroid hormones.
• Question 26: Glycogen is the storage form of glucose in animals. It is a polysaccharide that can be broken down into glucose when energy is needed.
• Question 27: The first electron shell (n = 1) of an atom can hold a maximum of 2 electrons, based on the electron - shell model.
• Question 28: Oxidase is an enzyme. Enzymes often have names ending in "-ase" and catalyze oxidation - reduction reactions. Glucose is a sugar, triglyceride is a lipid, nucleotide is a component of nucleic acids, and omega - 3 fatty acid is a type of lipid.

Answer:

1. c. ATP is a modified nucleotide with three phosphate groups, ribose, and adenine
2. c. they are biological catalysts
3. b. cholesterol
4. d. glucose
5. b. 2
6. c. oxidase