GRCC BI 121 Lec Unit 1 Review
Questions and Answers Latest Version
Already Passed
What is the role of aquaporins in cells?
✔✔Facilitate water movement across membranes
Which part of the cell is involved in detoxifying harmful substances?
✔✔Smooth endoplasmic reticulum
What is the primary function of microvilli on epithelial cells?
✔✔Increase surface area for absorption
Which molecule helps stabilize cell membranes in varying temperatures?
✔✔Cholesterol
What triggers the release of neurotransmitters at a synapse?
✔✔Calcium ion influx
1
,Which ion is primarily responsible for initiating muscle contraction?
✔✔Calcium
What is the function of myelin sheath in neurons?
✔✔Insulate axons and speed up signal transmission
Which molecule acts as the primary buffer in human blood?
✔✔Bicarbonate
What is the role of histones in the nucleus?
✔✔Organize and package DNA
Which pigment protects skin from UV radiation?
✔✔Melanin
Which enzyme unzips DNA during replication?
✔✔Helicase
2
, What is the role of chaperone proteins in cells?
✔✔Assist in protein folding
Which process is responsible for converting fatty acids into energy?
✔✔Beta-oxidation
Which structure in the heart prevents backflow of blood?
✔✔Valve
What is the purpose of surfactant in the lungs?
✔✔Reduce surface tension in alveoli
Which molecule is required for muscle relaxation?
✔✔ATP
What causes the depolarization phase of an action potential?
✔✔Sodium ion influx
3
Questions and Answers Latest Version
Already Passed
What is the role of aquaporins in cells?
✔✔Facilitate water movement across membranes
Which part of the cell is involved in detoxifying harmful substances?
✔✔Smooth endoplasmic reticulum
What is the primary function of microvilli on epithelial cells?
✔✔Increase surface area for absorption
Which molecule helps stabilize cell membranes in varying temperatures?
✔✔Cholesterol
What triggers the release of neurotransmitters at a synapse?
✔✔Calcium ion influx
1
,Which ion is primarily responsible for initiating muscle contraction?
✔✔Calcium
What is the function of myelin sheath in neurons?
✔✔Insulate axons and speed up signal transmission
Which molecule acts as the primary buffer in human blood?
✔✔Bicarbonate
What is the role of histones in the nucleus?
✔✔Organize and package DNA
Which pigment protects skin from UV radiation?
✔✔Melanin
Which enzyme unzips DNA during replication?
✔✔Helicase
2
, What is the role of chaperone proteins in cells?
✔✔Assist in protein folding
Which process is responsible for converting fatty acids into energy?
✔✔Beta-oxidation
Which structure in the heart prevents backflow of blood?
✔✔Valve
What is the purpose of surfactant in the lungs?
✔✔Reduce surface tension in alveoli
Which molecule is required for muscle relaxation?
✔✔ATP
What causes the depolarization phase of an action potential?
✔✔Sodium ion influx
3
