Topic 1: Key Concepts Flashcards
What are the two types of cells?
Eukaryotic (animals and plants) and prokaryotic
What is the difference between an eukaryotic and prokaryotic cell?
An eukaryotic cell contains a nucleus and membrane-bound organelles, a prokaryotic cell doesn’t
What are the components of both plant and animal cells?
Nucleus, cytoplasm, cell membrane, mitochondria and ribosomes
How is genetic information stored in an eukaryotic cell?
Within the nucleus, arranged in chromosomes
What is the function of the nucleus?
Storing genetic information and controls cellular activities
What is the structure of the cytoplasm?
Fluid component of the cell and contains organelles, enzymes dissolved ions and nutrients
What is the function of the cytoplasm?
Site of cellular reactions
What is the function of the cell membrane?
Controls the entry and exit of materials into and out of the cell
What is the function of the mitochondria?
Site of later stages of aerobic respiration
What is the function of the ribosomes?
Joins amino acids in a specific order during translation
Which organelles are found in plant cells only?
Large permanent vacuole, cell wall and chloroplast
What is the cell wall made of?
Cellulose
What is the function of the cell wall?
Provides strength and prevents the bursting when water enters by osmosis
What does the permanent vacuole contain?
A solution of salts, sugars and organic acids
What is the function of the permanent vacuole?
Supports the cell, maintaining its turgidity
What is the function of the chloroplasts?
Site of photosynthesis
Why do chloroplast appear green?
Contain chlorophyll which is a green pigment
What organelles are found in prokaryotic cells?
Chromosomal DNA, plasmid DNA, cell wall, cell membrane, ribosomes and flagella
How is genetic information stored in a prokaryotic cell?
Found free within the cytoplasm as chromosomal DNA or plasmid DNA
What are plasmid?
Small, circular loops of DNA found free in the cytoplasm and separated from the main DNA, they also carry genes that provide genetic advantages
What is the prokaryotic cell wall composed of?
Peptidoglycan
What is a flagellum?
Long, rotating ‘whip-like’ protrusion and enables bacteria to move
What is a haploid cell?
A cell that contains a single copy of each chromosome
What is a diploid cell?
A cell that contains two copies of each chromosome
What are gametes?
Reproductive and haploid cells
What is sexual reproduction in terms of chromosome number?
Two haploid gametes fuse resulting embryo has two chromosomes for each gene and two copies of each allele
How are egg cells adapted to their function?
Haploid nucleus contains genetic material, mitochondria in cytoplasm produce energy for the developing embryo, cytoplasm contains nutrients for the developing embryo and cell membrane hardens after fertilisation, preventing the entry of other sperm and ensuring the zygote is diploid
How are spermicide cells adapted to their function?
Haploid nucleus contains genetic information, tail enables movement, mitochondria provide energy for tail movement and acrosome contains enzymes that digest the egg cell membrane
Where are ciliated epithelial cells found?
Found lining the surface
What is the function of ciliated epithelial cells lining the airways?
Move in synchronised waves to beat mucus (containing dirt and pathogens) up to the back of the throat where it can be swallowed
What is magnification?
The number of times bigger an image appears compared to the size of the specimen