ch 1 Flashcards
1
Q
what is the central dogma
A
in all living cells, genetic information flows from DNA to RNA (transcription) and from RNA to protein (translation)
2
Q
what did Robert Hooke do
A
he used a simple microscope to examine cork and described it as “cells”
3
Q
who proposed the first two tenets of what is now called the cell theory
A
Schleiden and Schwann
4
Q
what are the first two tenets of the cell theory
A
- organisms are composed of one or more cells
- the cell is the smallest unit of life
5
Q
who confirmed the third tenet of the cell theory
A
Louis Pasteur
6
Q
what is the third tenet of the cell theory
A
- cells can only arise by division from a pre existing cell
7
Q
what are the features common to all cells
A
- complex and highly organized
- DNA - genetic program for reproduction
- plasma membrane - selective barrier
- cytoplasm
- ribosomes for protein synthesis
- respond to stimuli and adapt to their enviornment
- small
8
Q
why is it important that cells are small
A
they need high surface area to volume ratio
9
Q
what are the two classes of cells
A
prokaryotic and eukaryotic
10
Q
understand
A
okay
11
Q
A
