Cell structure and Division Flashcards
What is the structure and function of the cell-surface membrane?
-Mainly made of proteins and lipids
-Regulates the movement of substances in and out of the cell
-Has receptor molecules on it
What is the structure and function of the nucleus?
-Nuclear envelope with pores
-Contains chromosomes
-Contains a nucleolus
-Controls the cells activity
-DNA contains instructions to make proteins
-Pores allow substances to move between the nucleus and the cytoplasm
-Makes ribosomes
What is the structure and function of the mitochondria?
-Double membrane
-Inner membrane folded to make the cristae
-Inside is the matrix
-Site of aerobic respiration->produces ATP
What is the structure and function of the chloroplast?
-Double membrane
-Contains thylakoid membranes
-Grana is stacked thylakoid membranes
-Grana are linked together by lamellae
-Site of photosynthesis
What is the structure and function of the Golgi apparatus?
-Fluid-filled membrane bound flattened sacs
-Vesicles on edge of sacs
-Processes and packages new lipids and proteins
-Makes lysosomes
What is the structure and function of the Golgi vesicles?
-Fluid-filled sac in the cytoplasm
-Surrounded by a membrane
-Stores lipids and proteins and transports them out of the cell
What is the structure and function of lysosomes?
-Type of Golgi vesicle
-Round organelle with a membrane and no clear internal structure
-Contains lysozymes
What is the structure and function of ribosomes?
-Either floats free in the cytoplasm or is attached to the rough endoplasmic reticulum
-Made of proteins and RNA
-Where proteins are made
What is the structure and function of the rough endoplasmic reticulum?
-System of membranes enclosing a fluid-filled space
-Surface covered in proteins
-Folds and processes proteins made at ribosomes
What is the structure and function of the smooth endoplasmic reticulum?
-Same as rough but with no ribosomes
-Synthesises and processes lipids
What is the structure and function of the cell wall?
-In plants, algae and fungi
-In plants->cellulose
-In fungi->chitin
-Supports cells and prevents them from changing shape
What is the structure and function of the cell vacuole?
-Contains cell sap
-Surrounding membrane->tonoplast
-Maintains pressure inside cell and keeps the cell rigid.
What are the adaptations of the epithelial cells in the small intestine?
-Villi which increase the surface area
-Microvilli which further increase the surface area
-Lots of mitochondria
Name an adaptation of red blood cells.
-No nucleus to allow them to carry more oxygen
Name an adaptation of sperm cells.
-Lots of mitochondria for energy
Name the organelles present in a prokaryotic cell.
-Cytoplasm contains ribosomes (ribosomes are smaller than in a eukaryote)
-Cell-surface membrane (same as eukaryotic)
-Cell wall, made of murein (a glycoprotein)
-Capsule
-Plasmids (small loops of DNA)
-Circular DNA (not attached to histone proteins)
-Flagellum
Describe the process of binary fission.
-Circular DNA and plasmids replicate, circular DNA only replicated once but plasmids can be replicated multiple times
-Cells gets bigger and the DNA loops move to opposite poles of the cell
-Cytoplasm begins to divide and new cell wall begins to form
-Cytoplasm divides and two daughter cells are produced
Name 3 differences between a virus and a eukaryotic cell.
-Viruses are acellular and eukaryotic cells are cellular
-Viruses contain attachment proteins
-Viruses have a capsid