The document contains 4 multiple choice questions about biological concepts: 1. The first irreversible reaction in glycolysis is catalyzed by phosphofructokinase-1 (PFK-1). 2. ATP is a nucleotide that consists of a nitrogenous base, a sugar, and a phosphate group. 3. Statements 1 and 4 are true about the glycolytic pathway - there is a net gain of 2 ATP and it occurs in the cytoplasm. 4. Nucleosides consist of a nitrogenous base and a sugar.

1. Multiple Choice Questions.
1. Which of the following enzymes are involved in the First irreversible reaction in
glycolysis.
A. Peroxidase
B. PFK-1
C. Hexokinase
D. Pyruvate kinase
E. Glyceraldehyde phosphate dehydrogenase
2. ATP is a ?
A. Nucleoside
B. Carbohydrate
C. Nucleotide
D. Triglyceride
E. Amino Acid
The key below is to be used to answer the first following questions.
A. 1, 2 and 3 are correct
B. 1 and 3 are correct
C. 2 and 4 are correct
D. only 4 is correct
E. all are correct
3. Which of the following statements are true about the glycolytic pathway ?
1. There is a net gain of 2 ATP
2. It is also called The Citric Acid Cycle
3. 1 molecule of glucose is converted to 2 molecules of pyruvate
4. It occurs in the cytoplasm of the cell
4. Nucleosides consists of ?
1. A base only
2. Nitrogen only
3. Base + Sugar + Phosphate
4. Base + Sugar only