4 mistakes learners make with cells, each one named and explained.
Each part of a cell has one job, and the job explains the shape.
The genetic material of a bacterial cell is placed inside a true nucleus.
Every cell diagram you have ever drawn had a nucleus in the middle of it.
Question. Where is the DNA in a bacterial cell
A common answer. in the nucleus
The answer. in a single loop, free in the cytoplasm
Why. Prokaryote means before the nucleus, which is exactly what the word is telling you.
The name of the group is the answer. Pro-karyote: no proper nucleus.
A bacterium is described as keeping its DNA in the mitochondria or a chloroplast.
Those are the organelles most recently learned, so they are the ones that come to mind.
Question. Where is bacterial DNA
A common answer. inside the mitochondria
The answer. free in the cytoplasm
Why. Bacteria have none of the membrane-bound organelles.
If it has a membrane around it and is inside a cell, a bacterium does not have it.
A part both cells share, such as the cell membrane or a mitochondrion, is given as plant only.
The plant cell diagram is drawn with more labels, so every label on it looks like a plant feature.
Question. Which part is in a plant cell but not an animal cell
A common answer. the cell membrane
The answer. the cell wall
Why. Animal cells have membranes too. Only the wall, the chloroplasts and the large vacuole are extra.
Learn the short list of three extras rather than the long list of everything.
A cell part is named correctly but paired with another part's job, such as the nucleus controlling what enters the cell.
The parts are learned as a labelled diagram, and a diagram shows where things are, not what they do.
Question. Which part controls what enters and leaves the cell
A common answer. the nucleus
The answer. the cell membrane
Why. The membrane is the only part that surrounds the cell, so it is the only one that can control the boundary.
Learn each part by the one job only it can do, and its position stops being the thing you remember.
WAJD spots these patterns in your child's answers and names the one behind their wrong answers, instead of just marking them wrong.