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Name ______________________________ Class ___________________ Date __________________
Directed Reading Chapter 1 Lesson 1
1. What is the smallest thing that can do everything needed for life?
a. organ
b. cell
c. tissue
d. atom
CELLS AND THE CELL THEORY
Read the words in the box. Read the sentences. Fill in each blank with the word
that best completes the sentence.
animals
cells
microscope
plants
2. Robert Hooke was the first person to describe______________________.
3. Hooke built a(n) ______________________ and used it to look at cells.
4. Hooke spent most of his time looking at the cells of ______________________.
5. Hooke’s microscope could not see the cells of ______________________.
6. Where did Leeuwenhoek find what he called animalcules?
a. in animal blood
b. in bread dough
c. in cells
d. in pond scum
The Cell Theory
7. Which of these is NOT a part of the cell theory?
a. Most cells are too small to be seen without a microscope.
b. All organisms are made of one or more cells
c. The cell is the basic unit of all living things.
d. All cells come from existing cells.
CELL SIZE
Many Small Cells
8. What limits most cells to a very small size?
a. the surface area–to-volume ratio
b. the size of the nucleus
c. the amount of fluid in the cell
d. the hardness of the cell wall
PARTS OF A CELL
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
9
Cell: The Basic Units of Life
Name ______________________________ Class ___________________ Date __________________
The Cell Membrane and Cytoplasm
cells
cytoplasm
cell membrane
9. The layer that protects a cell from its environment is the ______________________.
10. The fluid inside a cell is called ______________________.
11. The cell membrane and cytoplasm are two parts of all ______________________.
Organelles
Circle the letter of the best answer for each question.
12. What are structures that perform specific functions inside the cell called?
a. organisms
b.organelles
c. cell membranes
d. DNA
Genetic Material
13. What is the organelle which contains the cell’s DNA called?
a. membrane
b. nucleus
c. cell wall
d. cytoplasm
TWO KINDS OF CELLS
cells
eukaroytic
prokaryotic
14. The two groups of ______________________ are eukaryoticand prokaryotic.
15. Cells that are ______________________ have a nucleus.
16. Cells that are ______________________ do not have a nucleus.
.
EUKARYOTIC CELLS AND EUKARYOTES
17. What does a eukaryote have that a prokaryote does not?
a. one or more cells
b. cells with a nucleus
c. cells with DNA
d. cells with membranes
18. Which of these words describes you and other humans?
a. eukaryote
b. prokaryote
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
10
Cell: The Basic Units of Life