Histones are proteins that break chromosomes down into chromatin
Histones are tiny organelles that used to recall the information of the cell. During the evolution of cells, they were replaced by the nuclus
Tiny proteins held inside of the nucleus that record the cells activities
7. During transcription, why is information from DNA copied onto RNA?
DNA cannot obtain enough energy to properly deliver information to the other organelles and so it passes info onto RNA, which can gain enough energy to transfer the info
DNA is too large to leave the nucleus so its information is copied onto RNA which is small enough to leave through the nuclear pores
RNA would be wasted if it wasn't used
DNA is too important to leave the nucleus so RNA acts as a messenger delivering information to other organelles within the cell
8. Which are three features of plant cell walls?
Found inside the cell membrane, freely permeable, and make the plant cell rigid
Made of cellulose, are partially permeable, and are on the outside of the cell membrane
Made of cellulose, are freely permeable, and are on the outside of the cell membrane
Are rigid structures, allow the plant cell to change shape, and are partially permeable.
9. The fluid interior of mitochondria is called?
The mitroplasm
The matrix
The chromatin
The cisternae
10. Where are proteins synthesised?
On the ribosomes bound to the endoplasmic reticulum
In the cisternae of the golgi apparatus
Within the endoplasmic reticulim
In the ribosomes that are found free floating in the cytoplasm
11. The internal membranes inside chloroplasts form flattened sacks - what are these sacks called?
Thylakoids
Granum
Stroma
Chloroplast envolopes
12. How is DNA arranged in prokaryotes and eukaryotes?
Prokaryotes - circular Eukaryotes - linear
Prokaryotes and eukaryotes - linear
Prokaryotes - linear Euaryotes- circular
Prokaryotes and eukaryotes - cirlular
13. What are lysosomes?
Specialised forms of vesicles containing hydrolytic enzymes (digestive enzymes)
Specialised digestive enzymes
External organelles that keep cells stationary
Vesicles that play a key role in protein synthesis
14. I'm an organelle found in plant cells. I contain an inner membrane that's arranged in flattened sacs. Which organelle am i?
The chloroplast
Secretory vesicles
The mitrochondria
A centriole
15. What are microtubules?
Tiny organelles on the surface of the cell that record information about the cells environment
A component of the cytoskeleton that can break down the cell and rebuild it again during complex cellular processes
A component of the cytoskeleton that forms a scaffold like structure that determines the shape of the cell
Contractile fibres formed from the protein actin
16. What is the name of the dark region within the nucleus?
The DNA
The nucleolus
The premature nuclei
The nuclear sap
17. What is exocytosis?
When materials are transported out of the cell via secretory vesicles
A complex form of cellular division in some cells.
When materials are transported into the cell via secretory vesicles
The process in which cells get rid of or burn excess energy