Cell Theory
All living things are made of one or more of these basic units of life.
Cells
Cells
This organelle contains most of the cell's DNA and helps direct the cell's activities.
These cells lack a membrane-bound nucleus.
Prokaryotic Cells
This rigid structure surrounds the cell membrane of a plant cell and provides support.
The Cell Wall
According to cell theory, all cells come from these.
Pre-existing cells
This part of a compound light microscope is the lens you look through.
Eyepiece or Ocular Lens
This structure controls what enters and leaves the cell, helping the cell maintain homeostasis.
Cell Membrane
These cells contain a nucleus and other membrane-bound organelles.
Eukaryotic Cells
This organelle captures light energy and uses it to help produce sugars during photosynthesis.
Chloroplast
This principle of cell theory explains why the cell is considered the basic unit of structure and function in living things.
Cells are the basic unit of life
A student is viewing a specimen under a microscope and wants to make the image appear larger. Which microscope component should the student change to increase magnification?
Objective lens
These tiny structures assemble amino acids into proteins.
Ribosomes
Due to the lack of a nucleus in the prokaryotic cells, DNA is typically found free-floating in the ______
Cytoplasm
Unlike animal cells, plant cells typically have this large structure that stores water and helps maintain internal pressure.
Central Vacuole
A scientist observes that a tiny organism consists of only one cell. This organism is an example of a living thing that is described by this term.
Unicellular
A student switches from a 10× objective lens to a 40× objective lens. What is the total magnification?
400x
A cell needs to make and transport proteins. These two structures work together to help complete the job.
Ribosomes and Rough Endoplasmic Reticulum (ER)
Both prokaryotic and eukaryotic cells contain these structures that synthesize proteins.
Ribosomes
An animal cell and a plant cell are examined under a microscope. What are two organelles you would expect to find in a typical plant cell but not in an animal cell?
Chloroplast, Cell Wall, and/or Central Vacuole
When a cut on your skin heals, new cells form to replace damaged or lost cells. Which principle of cell theory explains where these new cells come from?
All cells come from pre-existing
A scientist wants to observe details inside a cell that a standard light microscope can't clearly reveal. This type of microscope is better suited for the task.
Electron Microscope
A muscle cell needs large amounts of ATP to support muscle contraction. Which organelle is especially important for supplying this energy through cellular respiration?
Mitochondria
A student observes a cell that has DNA, cytoplasm, ribosomes, and a cell membrane, but no membrane-bound nucleus. Based on this evidence, the cell is most likely which type? (Give an example for an extra 100 pts)
Prokaryotic Cell and a common example is: Bacteria
These organelles are especially common in animal cells and contain enzymes that break down waste and worn-out cell parts.
Lysosomes