Ch. 4.1 Flashcards
Eukaryotic Overview
What is the endosymbiotic theory?
The evolution of eukaryotes as a series of sequential, cell-merging events between an ancient eukaryotic ancestor and certain prokaryotes.
The cells involved were
1) the ancient eukaryotic cell
2) an ancient Rickettsia-like prokaryote- these together formed a protoeukaryote. The Rickettsia-like cell became the mitochondria of our current eukaryotic cells.
3) Later, these proteukaryotic cells merged with photosynthetic prokaryote (possible cyanobacteria), which became the cells chloroplast.
What kind of DNA and ribosomes do mitochondria and chloroplasts have?
Circular DNA and 70S ribosomes?
What are the four main groups of eukaryotic cells?
Plants, animals, protists, and fungi.
Define eukaryotic organisms types.
Unicellular: Protists and yeast (type of fungi)
Multicellular: Animals, plants, and most fungi
Define eukaryotic size
Usually much larger than prokaryotes
Define types of eukaryotic cell division
Asexual mitosis and sexual meiosis
What substance does the eukaryotic plasma membrane contain that prokaryotic plasma membrane lacks?
Often contains sterols
What kinds of eukaryotic cells have a cell wall?
Those of plants, protists, and certain fungi.
Does a eukaryotic cell have a nucleus?
Yes
Describe types of ribosomes present in eukaryotes, and where they are located.
80S: Cytoplasm and rough endoplasmic reticulum
70S: Mitocondria and cholorplasts
Eukaryotic genetic material type
DNA
Chromosome type and arrangement
Multicellular and arranged linearly.
Membrane bound organelles present?
Yes
Define mitosis
Asexual reproduction in which one parent cell produces two identical offspring cells with the same number of chromosomes as the parent cell. All human cells except for eggs and sperm divide using mitosis. This is the most common way eukaryotic cells divide.
Define meiosis
Sexual reproduction in which the parent cell splits into four genetically unique gametes with half the number of chromosomes as the parents. A gamete must combine with it’s complimentary gamete to form a zygote.