Question

the following statements about organelles is not true?
a. each organelle carries out only one role in the life functions of the cell.
b. there are some organelles found in plant cells that are not in animal cells.
c. each organelle carries out functions similar to the way organs function in a large organism.
d. there are organelles in plant and animal cells that work directly with other organelles.

1. cells have a small size to efficiently move materials into and out of the cell across the cell membrane. which of the following best describes why cells move materials across the cell membrane?

a. to create diversity
b. to maintain homeostasis
c. to continue cell evolution
d. to establish cell differentiation

1. a busy city is similar to a cell. both a city and a cell are made up of many important parts that work together as a whole. what could you find in a city that

Explanation:

Question 7

To determine why cells move materials across the cell membrane, we analyze each option:

• Option A: Creating diversity is not the primary reason for material movement across the membrane.
• Option B: Maintaining homeostasis (stable internal environment) requires the cell to take in necessary substances (like nutrients) and expel waste or harmful substances. Moving materials across the membrane helps regulate conditions inside the cell, so this is the correct reason.
• Option C: Continuing cell evolution is not directly related to routine material movement across the membrane.
• Option D: Establishing cell differentiation is about cells becoming specialized, not about membrane transport of materials.

Let's analyze each option about organelles:

• Option A: Organelles can have multiple roles in the cell (e.g., mitochondria are involved in energy production and apoptosis - related processes), so saying each organelle carries out only one role is NOT true.
• Option B: There are organelles like chloroplasts (plant - specific) and centrioles (animal - specific in many cases), so this statement is true.
• Option C: Organelles function similarly to organs in a large organism (organs and organelles both have specialized functions for the whole system), so this is true.
• Option D: In both plant and animal cells, organelles (like nucleus, mitochondria) work together, so this is true.

Answer:

B. to maintain homeostasis

Question (the one about organelles - partially visible)