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6th Grade- Sci Ch 1
Question | Answer |
---|---|
Cell membrane | Controls the substances that enter and leave the cell. |
Anton von Leeuwenhoek | The first person to see bacteria from his teeth scrapings. |
Magnification | The ability to make things look larger than they are. |
Endoplasmic reticulum | Passageways that transport proteins to the cell. |
Cell wall | A strong layer of cellulose that surrounds only plant cells. |
Resolution | The ability to clearly distinguish the parts of an object. |
Ribosomes | These organelles produce proteins. |
Mitochondria | These organelles produce energy for the cell. |
Golgi bodies | These organelles receives proteins and package them for delivery to the cell. |
Nucleus | The "brain" of the cell. |
Cytoplasm | Gel-like substance between the nucleus and cell membrane. |
Chloroplasts | Traps the suns energy to produce food for the cell. |
Vacuole | Part of the cell that stores food, water, and wastes. |
Lipids | Fats, waxes and oils. |
DNA | This is shaped like a twisted ladder. |
Diffusion | The process by which molecules move from an area of higher to lower concentration (spraying perfume in a room and later smelling it and all parts of the room). |
Selectively permeable | A cell membrane is this. It means that some substances can pass through but others cannot. |
Osmosis | The diffusion of water molecules through a membrane from a higher to lower concentration. |
Genes | Located on the chromosomes, these sections of DNA determine an organism's characteristics and control its development and growth. |
Chromosomes | These contain the genes. I human has 23 pairs. |
Two reasons why it's important for a cell membrane to be selectively permeable? | 1. It lets things in. (Oxygen, carbon dioxide, water, nutrients) 2. It keeps things out. (Salt, large molecules). |
What does a cell membrane let in? | Oxygen, carbon dioxide, water, nutrients. |
What does a cell membrane keep out? | Salt, large molecules. |
List three ways a plant cell and an animal cells are similar. | They both have a cell membrane, cytoplasm, and a vacuole. |
List three ways a plant cell and an animal cell are different. | Only plant cells have a cell wall, chloroplasts, and chlorophyll. |