Latest Biology Quiz

Which organelle contains DNA and controls the cell?

• Cell membrane

• nucleus

• nucleolus

• lysosme

Which organelle controls what goes in and out of the cell?

• nucleus

• nucleolus

• cell membrane

• nuclear membrane

The gelatinous material inside the cell

• ribosomes

• lysosome

• granum

• cytoplasm

This pigment is found in chloroplasts.

• rhodopsin

• chlorophyll

• thylakoid

• stroma

In passive transport, the concentration gradient goes from..

• Low to low

• High to low

• Low to high

• High to high

The cellular process in which materials are moved across a membrane from an area of low concentration to an area of high concentration is called

• Osmosis
• Simple Diffusion
• Active Transport
• Passive Transport 

Describe the movement of molecules in the illustration.

• Molecules are moving from a lower concentration to a higher concentration. 
• Molecules are moving from a lower concentration to a higher concentration. 
• Molecules are moving from a higher concentration to a lower concentration and then from a lower to higher concentration.
• Molecules are moving from a lower concentration to a higher concentration and then from a higher concentration to a lower concentration. 

How is diffusion different from this process?

•  Diffusion takes place due to osmotic pressure. 
• Diffusion requires cellular energy for the transfer of molecules.
• Diffusion requires protein channels as a passage-way for particles
• Diffusion transfers particles from an area of high to low concentration. 

Osmosis is the diffusion of __________.

• water
• glucose
• air
• passive transport

Passive transport requires no

• concentration gradients
• osmosis
• motion
• energy