A Ball Thrown Straight Upward Takes 10 Seconds for Its

question 62

Multiple Choice

A ball thrown straight upward takes 10 seconds for its up-and-down round trip. Because of air resistance, the time taken for the ball just to go up is

• A)less than 5 s.
• B)5 s.
• C)more than 5 s.

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Definitions:

Active Transport

The movement of substances across cell membranes against their concentration gradient, requiring energy expenditure by the cell.

Connexin Molecules

Protein molecules that assemble into gap junctions, facilitating communication between adjacent cells by allowing the passage of ions and small molecules.

Sodium-Potassium Pump

A vital cell membrane protein that transports sodium ions out of and potassium ions into cells, maintaining cellular electrochemical gradients.

Carrier Protein

A type of membrane protein involved in facilitated diffusion, helping to transport substances across a cell membrane without expenditure of energy.