1st Year Biology 1st Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. Which of the following processes includes all others.
   1. Osmosis
   2. Diffusion of a solute across a membrane
   3. Facilitated diffusion
   4. Passive transport
2. If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield or products is to:
   1. Add more of the enzyme
   2. Add more substrate
   3. Add an allosteric inhibitor
   4. Add a noncompetitive inhibitor
3. Glucose and fructose are examples of:
   1. Optical isomers
   2. Structural isomers
   3. Functional group isomers
   4. Geometrical isomers
4. The Calvin cycle is also called
   1. C3 pathway
   2. C4 pathway
   3. CAM pathway
   4. Krebs cycle
5. Some cellular organelles are bound by a single membrane, while other organelles have two membranes (envelopes) around them. Which one of the following is correct?
   1. Single membrane : Double membranes peroxysomes, lysosome nucleus, chloroplast
   2. Single membrane : Double membranes chloroplast, lysosome nucleus, perox:ysomes
   3. Single membrane : Double membranes nucleus, chloroplast lysosome, perox:ysomes
   4. Single membrane : Double membranes nucleus, lysosome chloroplast, peroxysomes
6. Who classified enzymes based on reaction types and mechanisms in 1961?
   1. Watson and Crick
   2. International Union of Biochemistry
   3. Pasteur
   4. Fischer
7. Proteins are classified into how many main types based on structure and shape?
   1. One
   2. Two
   3. Three
   4. Four
8. The first step of glycolysis is best described as
   1. Oxidation
   2. Phosphorylation of glucose
   3. Hydrolysis of ATP to ADP without phosphorylation
   4. Decarboxylation
9. Which of the following can pass through the cell membrane by simple diffusion?
   1. Glucose
   2. Amino acids
   3. Oxygen and carbon dioxide
   4. Proteins
10. The energy that must be added to start a reaction is called:
    1. Potential energy
    2. Kinetic energy
    3. Energy of activation
    4. Thermal energy
11. Each codon in mRNA consists of how many nucleotides?
    1. One
    2. Two
    3. Three
    4. Four
12. The main accessory pigment is:
    1. Chlorophyll-b
    2. Chlorophyll-a
    3. Cytochrome
    4. RuBP