Cells are the basic units of life. There are two main types of cells: prokaryotic cells which lack a nucleus, and eukaryotic cells which contain a nucleus surrounded by a nuclear membrane. Key cell structures include the cell membrane, cell wall, cytoplasm, organelles, vacuoles, mitochondria, and chloroplasts. Robert Hooke is credited with first observing cells in 1665 using a microscope to view cork.

1. WHO OR WHAT AM I?
WHAT ARE CELLS? 1st
year ESO.
TERMS:
1. CELLS
2. ROBERT HOOK
3. PROKARYOTIC CELLS
4. EUKARYOTIC CELLS
5. CELL MEMBRANE
6. CELL WALL
7. CYTOPLASM
8. NUCLEUS
9. ORGANELLES
10.VACUOLES
11.MITOCHONDRIA
12.GENETIC MATERIAL
13.CHLOROPLASTS
1st
set of definitions
1. It controls and regulates how cells work and makes up the chromosomes.
2. It is the outer covering of a cell, like a skin around the cell that covers it completely.
3. He was the first person to use the term cells.
4. It is the part of a cell where energy is obtained.
5. A thick, rigid part of plant cells that surrounds the plasmatic membrane.
6. It is the inside of the cell. It is a jelly-like substance where many of the chemical reactions of the cell
take place.
7. The smallest units of life.
8. It contains genetic material.
9. Small structures in the cytoplasm.
10. Organelles that store a green pigment called chlorophyll.
11. Cells with no nucleus or nuclear membrane.

2. 12. They are like bags, surrounded by membranes, where substances accumulate, mainly water.
13. Cells which have a nucleus, separated from the cytoplasm by the nuclear membrane.
2nd set of definitions
a. The structural and functional units for all living things.
b. Small simple cells in which genetic material is dispersed throughout the cytoplasm.
Bacteria are made up of this type of cells.
c. They contain a pigment that absorbs the Sun’s energy to elaborate organic matter
during photosynthesis.
d. In 1665, he observed cavities in a thin slice of cork with a microscope and he called
them cells.
e. They take up most of the space in plant cells. They are also in animal cells, but they
are smaller.
f. They are small structures responsible for respiration, making and storing nutrients,
etc.
g. This DNA contains the hereditary information that is passed from one cell to the
daughter cell.
h. It is made of cellulose and gives the plant cell its shape and strengthens it.
i. It is usually found on one side in plant cells.
j. It keeps the cell together and controls what passes in and out.
k. Algae, protozoa, fungi, animals and plants have this type of cells.
l. It contains the organelles, mitochondria, vacuoles, etc.
m. It is the part of a cell where nutrients turn into energy.