History of DNA and nucleus

History of DNA

​10/11/2023
- 10/11 Bell Ringer
- History of DNA
- EdPuzzle
- Nucleus worksheet

Learning Standard

Research and describe the history of biology and the contributions of
scientists.

Robert Hooke

Discovered the first cell

Friedrich Miescher

-Discovered DNA

-Used pus from bandages

-He did not realize what the DNA was
at the time

Robert Brown

-Discovered the
nucleus of the
cell

-He did not
realize that all
plants and
animals have a
nucleus

Erwin Chargaff

-Discovered DNA base-pairing

-Adenine bonds with Thymine

-Guanine bonds with Cytosine

Rosalind Franklin

-Took the famous
x-ray picture of
DNA

-Used to discover
the structure

James Watson and
Francis Crick

-Discovered the
structure of DNA

-Double Helix

-Used Franklin’s
information without
her permission

Why wasn’t Rosalind Franklin given credit
for her part in the discovery of the
structure of DNA?

Franklin received no credit for her crucial contribution to
this discovery until years after her death. In 1968, Watson
published his memoir revealing that Rosalind Franklin was
the scientist who contributed the crucial X-ray
crystallography photograph

Poll

Who took the first x-ray picture of DNA?

• Rosalind Franklin

• Erwin Chargaff

• James Watson

• Francis Crick

Function

Important Structures

-Brain of the cell

-Controls growth,cell
division, and protein
synthesis

-Nuclear Envelope

-Surrounds the nucleoplasm

-Functions as a protective barrier
between cytoplasm and DNA

-Nucleoplasm

-Nuclear jelly

-Nuclear pores

-Openings that RNA + proteins to pass
through the membrane

-Chromatin

-Composed of DNA and proteins

-Nucleolus

-Produces ribosomes that are needed for
making proteins.

The Nucleus

https://www.youtube.com/watch?v=fV-sG3od1k0

Usually a dark spot in the center somewhere
near the middle of all the cytoplasm.

What controls the cell’s activities?

Where would the
nucleus be found in a eukaryotic
cell?

4 structures found in all cells

Cell Membrane

Cytoplasm

Ribosome

DNA

What type of cell has a

membrane-bound nucleus?

Eukaryote

Nuclear Membrane

membrane that
separates the nucleus
from the cytoplasm
and regulates what
enter and leaves the
nucleus

Nuclear Pore

Small openings in the nuclear
envelope (membrane) that
allows substances in or out

Nuclear envelope
(blue) with
nuclear pores
(pink)

Ribosomes

Produces proteins

Nucleolus

Produces ribosomes

Nucleoplasm

Fluid inside the nucleus

-“Nucleus jelly”

Chromatin

Hereditary material composed
of deoxyribonucleic acid and
proteins

To Do Today:
10/11 Bell Ringer
Edpuzzle History of DNA
10/11/2023 Nucleus Worksheet