1 - 9 van 9 bronnen weergeven

Cell theory

Introduction to cell theory--the idea that 1) all living things are made of one or more cells, 2) cells are the basic unit of life and 3) all cells come from other cells. Explore the roles that Hooke, Leeuwenhoek and others played in developing cell theory.

Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to the cell theory by suggesting that cells are the fundamental units of life and structure, and that all living things consist of one or more cells that originate from other cells by division. 

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2015
Schepper/Auteur
Sal Khan
Trefwoord
Cells

Cells and organisms

All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular).

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2022
Schepper/Auteur
Khan Academy
Trefwoord
Cells

Equivalent Fractions and the Simplest Form of a Fraction: 3 Videos

Part 1: Equivalent fractions and the simplest form of a fraction
Part 2: Examples of equivalent fractions
Part 3: Common mistakes and misconceptions

Onderwerp en thema
Form 1
Mathematics
Fractions
Proper, improper and mixed numbers
Type bron
Video
Taal
English
Uitgever
TicTac Learn
Publicatiedatum
2020
Schepper/Auteur
TicTac Learn
Trefwoord
Fractions
Equivalent fractions

Links

Equivalent Metric Units of Mass

In this online course, you will learn how to identify equivalent metric units of mass.

Onderwerp en thema
Form 1
Mathematics
Units
Units of mass
Type bron
Cursus
Taal
English
Uitgever
CK-12
Publicatiedatum
2022
Schepper/Auteur
CK-12
Trefwoord
Metric measurements
Units of mass
Units of measure

Introduction to the cell

Introduction to the cell.

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2017
Schepper/Auteur
Sal Khan
Trefwoord
Cells

Metric units of mass

Outcome

By the end of this course you will:

  • Be able to define what mass is
  • Be familiar with the metric units of mass
  • Understand how to compare different units of mass
  • Be able to convert one unit of mass to another
Onderwerp en thema
Form 1
Mathematics
Units
Units of mass
Type bron
Cursus
Taal
English
Publicatiedatum
2023

Proper, Improper and Mixed Fractions: 3 Videos

Part 1: Proper, improper and mixed fractions
Part 2: Examples of proper, improper and mixed fractions
Part 3: Common mistakes and misconceptions

Onderwerp en thema
Form 1
Mathematics
Fractions
Proper, improper and mixed numbers
Type bron
Video
Taal
English
Uitgever
TicTac Learn
Publicatiedatum
2020
Schepper/Auteur
TicTac Learn
Trefwoord
Fractions
Proper fractions
Improper fractions
Mixed numbers

Links

Scale of cells

Even though molecules, proteins, viruses, and cells are all tiny, there are significant size differences between them. The diameter of a water molecule is roughly 0.28 nanometers. The diameter of the protein hemoglobin is roughly 5 nanometers. The diameter of the HIV virus is roughly 120 nanometers. A red blood cell is 6-8 micrometers.

Onderwerp en thema
Form 1
Biology
Cell structure and organisation
Concept of cells
Type bron
Video
Taal
English
Uitgever
Khan Academy
Publicatiedatum
2015
Schepper/Auteur
Sal Khan
Trefwoord
Cells

Sum of Mixed Numbers

Use two methods to find the sum of mixed numbers: improper fractions and mixed numbers

Onderwerp en thema
Form 1
Mathematics
Fractions
Proper, improper and mixed numbers
Type bron
Video
Taal
English
Uitgever
Mathispower4u
Publicatiedatum
2016
Schepper/Auteur
Mathispower4u
Trefwoord
Mixed numbers
Improper fractions