Assignment1 Chapters 1, 2&3
Answer all questions. Read the questions carefully. Total 40
1.Explain the functions of effectors and receptors in a negative feedback loop.
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2. Match each organ system with the appropriate function: 5
Function
1 Provides movement and generates heat
System
Reproductive system
2 Provides oxygen to the bloodstream and
removes carbon dioxide from the
bloodstream
3 Breaks down and absorbs nutrients
Muscular system
4 Excretes waste products from the blood
Urinary system
5 Produces sperm/oocytes and hormones
Digestive system
Respiratory system
3. If an isotope of carbon has a mass number of 14 and an atomic number of 6, how
many neutrons does it have? Explain your answer: 5
4. The bonds between hydrogen and oxygen in water differ from the bonds between
hydrogen and carbon in carbohydrates. How and why do these bonds differ?
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5. If pure distilled water has a pH of 7.0, what is the concentration of H+ ions? What
is the concentration of OH- ions? What is the ion product of water?
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6. Match the following
5
Function
1 Detoxifies/inactivates drugs in live
2 Flat saccules that package secretions
3 Produces proteins on linked ribosomes
4 Contains enzymes of TCA cycle
5 The site of the translation step in protein
synthesis
7. Match the following
Function
1. Glycocalyx
Cell Organelle
Ribosome
Smooth ER
Rough ER
Mitochondria
Golgi apparatus
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2 Cell-to-cell recognition
3 Structural support
4 Ligand binding
5 Transporting solutes across the
membrane
6 Passageway completely across cell
membrane
Protein/ Organelle
Glycocalyx
Carrier proteins
Channel proteins
Extracellular protein fibers
Receptor proteins
Phospholipid bilayer
8. What is a mutation? Each amino acid is coded for by one or more triplet bases.
How would a mutation of the first , second or the third base affect the resulting amino
acid that it originally coded for?
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