There's physics and chemistry, but no collection of questions for biology (or at least I didn't see one...). So let me start the ball rolling! Anyone who has questions to share, do post them here as well (:
- Cells without nucleoli die because they do no possess
A centrioles and are unable to undergo cell division.
B lysosomes and are unable to destroy worn out organelles.
C mitochondria and are unable to obtain energy.
D ribosomes and are unable to manufacture proteins.
Ans: D. Nucleoli are responsible for the production of ribosomes, which are essential in protein synthesis.
- What is the site of enzyme synthesis in cells?
A Golgi body
B Lysosome
C Ribosome
D Smooth endoplasmic reticulum
Ans: C. As enzymes are proteins, they are manufactured in the ribosomes during protein synthesis.
- What is the role of cholesterol in the cell surface membrane?
A to assist active transport
B to assist facilitated diffusion
C to provide hydrophilic channels
D to regulate fluidity of the membrane
Ans: D. Cholesterol helps to reduce the movement of phospholipids in the phospholipid bilayer and prevent changes in the membrane fluidity due to temperature changes,
Credits: Redspot Biology Key Points Exam Guide