Question

practice exam (biology)
multiple choice (1 - 4)

1. which macromolecule is primarily used for long - term energy storage?

a) carbohydrates
b) lipids
c) proteins
d) nucleic acids

1. what type of bond joins two monosaccharides?

a) ionic bond
b) hydrogen bond
c) glycosidic bond
d) peptide bond

1. in an energy pyramid, which level has the least available energy?

a) producers
b) primary consumers
c) secondary consumers
d) tertiary consumers

1. which organelle is responsible for producing atp in cells?

a) chloroplast
b) ribosome
c) mitochondrion
d) nucleus
fill - in - the - blank (5 - 7)

1. the process by which plants convert light energy into chemical energy is called ________.
2. the four types of macromolecules are carbohydrates, lipids, proteins, and ________.
3. a ________ factor limits a population regardless of its size (e.g., natural disasters).

true/false (8 - 10)

1. saturated fats contain only single bonds between carbon atoms. (t/f) ________
2. population density is the total number of organisms in a species, not how they are spread out. (t/f) ________
3. steroids are a type of lipid with a structure made up of four carbon rings. (t/f) ________

Explanation:

1. Lipids store energy long - term. Carbohydrates are for short - term energy, proteins for structure and function, and nucleic acids for genetic information.
2. A glycosidic bond links monosaccharides. Ionic bonds are between ions, hydrogen bonds are weak intermolecular forces, and peptide bonds link amino acids in proteins.
3. In an energy pyramid, energy decreases as you move up the trophic levels. Tertiary consumers are at the top and have the least available energy.
4. Mitochondria are the powerhouses of the cell and produce ATP. Chloroplasts are for photosynthesis, ribosomes for protein synthesis, and the nucleus contains genetic material.
5. Photosynthesis is the process by which plants convert light energy to chemical energy.
6. Nucleic acids are the fourth type of macromolecule.
7. A density - independent factor limits a population regardless of size.
8. Saturated fats have only single carbon - carbon bonds.
9. Population density is the number of organisms per unit area, not just the total number.
10. Steroids have a structure of four carbon rings and are lipids.

Answer:

1. b) Lipids
2. c) Glycosidic bond
3. d) Tertiary consumers
4. c) Mitochondrion
5. Photosynthesis
6. Nucleic acids
7. Density - independent
8. T
9. F
10. T