Biology Illinois Edition (Glencoe Science)
Biology Illinois Edition (Glencoe Science)
7th Edition
ISBN: 9780078759864
Author: Alton Biggs
Publisher: MCG
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Chapter 7, Problem 1A
Summary Introduction

To replace:

The italicized word with a correct vocabulary term in the given sentence

Introduction: Robert Hooke was the first one to use the term ‘cell’. A cell is the structural and functional unit of all living organisms. Cells exist in all shapes and sizes. They differ in the kind of function they perform for the organism.

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Answer to Problem 1A

The plasma membrane is a structure that surrounds a cell and helps control what enters and exits the cell.

Explanation of Solution

All cells have a special membrane called plasma membrane that acts as a thin flexible boundary between a cell and its watery environment. It controls what enters and leave the cell. The cells of our skin and that of a plant stem, all have a plasma membrane. It also helps in maintaining homeostasis in an organism. Plasma membranes are selectively permeable as they allow only certain substances to pass through while keeping others out. All prokaryotes and eukaryotes have plasma membrane.

The nucleus is like a manger of the cell. It controls the activities of the cell. It stores the genetic material of the cell which contains information for protein synthesis. Nucleus does not surround the cell but is present inside a cell. Hence this is not the correct word.

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