7.1 Slides Flashcards
What is a zygote?
the 1st cell of a human
what kinds of chromosomes do males and females have?
xy chromosomes- boys
xx chromosomes- girls
What percentage of DNA do we share with other humans?
99.8% (DNA is the genetic blueprint)
Who first figured out that they could magnify objects by putting lenses in combination with each other?
early 1500s eyeglass makers in Europe
What did Englishman Robert Hooke do in 1665
viewed cork cells and coined the word cell
What did scholar Anton van Leeuwenhoek of Dutch decent do in 1665?
the first scholar to view living microscopic organisms with a magnification glass, microranisms were from the human mouth (observed bacteria)
What did Mathias Schleiden (German botanist) do in 1838?
concluded plants are made up of cells
What did Theodore Swann do in 1839?
stated that all animals were made up pof cells
What did Rudolf Virchow (German Physician) do is 1855?
concluded that new cells could only result from division of existing cells
Electron microscopes are one of the most:
powerful (atomic is the most powerful)
what are the 2 major types of electron microscopes
scanning (scans surface to specimens producing a 3D picture and transmission (used to view the internal components of cells like cell organelles
What do prokarytoes and eukaryotes have in common?
have DNA, ribosmes, cytoplsm, plasma membrane, can both be single celled
In what ways are prokaryotes differnet from eukaryotes?
oldest cell type, small and simple, no nulceus, organelles, are singles celled and have singular circular chromosome
In what ways are eukaryotes differnet from prokaryotes?
evolved from prokaryotes, larger nad mroe complex, contain nucleus, organelles, can be single celled of multicellular, have multiple linear chromosomes
