Author: Laila Elsheikh

I'm a retired NY state certified science teacher, a doctor of veterinary medicine.

GENETICS

A Genious Student Explains A Genetic Lesson By A-Rap Song.

Post author By Laila Elsheikh
Post date November 4, 2017
Sticky post

https://youtu.be/_x2RksGrzyE

Tags chromosomes, DNA, Gene expression., genes variations, PROTEIN SYNTHESIS, RNA

Check your understanding!

Post author By Laila Elsheikh
Post date October 8, 2017

What do you study about an organism to learn about its metabolism ?
With an example explain the term homeostasis .
How can you define the term life?
Put these terms in a complete sentence that explain their meaning. ( Cells, Organisms, Strucure, & function).
Why do organisms reproduce?

Similarities and Differences Among Living things (organisms).

Post author By Laila Elsheikh
Post date September 29, 2017
Sticky post

ORGANISMS -Living Things-

A tree, a cow, a mushroom.bacteria (microscopic), and a student in your class, are all organisms , that are both similar and different from each other. Living things are also different from nonliving things. Can you name some characteristics that are similar among all living things? Ok how about naming a few differences among them. Try to explain your answers.

What is life?

There is no agreement among scientists for a simple definition of life. All organisms share characteristics shown only by living things.

Characetisics of living things:

All are organized structures – made of cells– that are the basic units of structure and function.
All use energy to perform all life activities including growth and development.
all organisms maintain
homeostasis– their internal environment, regardless of an unstable external .environment.
All organisms reproduce by passing their (genetic) heredity information to new organisms (next generation )
Nonliving things have no functioning cells and no metabolic processes.Reproduction and maintenance of homeostasis are not carried out.
)https://youtu.be/30qOijooVBS7o

https://www.youtube.com/watch?v=30qOijVBS7o&feature=share

Tags Cell, Energy, Environment, science

Humans Impact On The Environment (Positive Aspect)

Post author By Laila Elsheikh
Post date September 11, 2014

Humans and the environment are in a dynamic interaction., that may lead to to drastic changes in both sides.Let us examine how humans improve their environment and protect it.

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Humans Impact On The Environment ( Postive Aspect)

Post author By Laila Elsheikh
Post date September 11, 2014

Tags Biological Control, Recycling

Ecological Succession

Post author By Laila Elsheikh
Post date May 17, 2014

Ecological succession:

This is a very unique process that changes communities – in ecosystems – over time.This series of changes lead to the development of a stable or climax community.This gradual process is summarized by this power point presentation.

Tags Climax community, Pioneer organism, Succession

ECOLOGY

IMPORTANT ECOLOLGICAL TERMS TO KNOW!

Post author By Laila Elsheikh
Post date May 8, 2014

Tags Biodiversity, Carrying capacity, Competition, Ecology, Habitat, Niche

ECOLOGY LIVING THINGS

FOOD CHAIN

Post author By Laila Elsheikh
Post date April 28, 2014

FOOD CHAIN

This power point presentation will take you in a journey though the amazing interactions among the biotic components of the. environment. specifically it discusses and explains the following concepts:

Food Chain

Food Web

Pyramids of Energy and biomass.

Tags Energy flow, energy pyramid, food chain, food web, primary consumers, producers, pyramid of biomass, trophic level

ENERGY FLOW: Symbiotic Relationship

Post author By Laila Elsheikh
Post date April 19, 2014

Organisms interact in an ecosystem as they get food(energy) to survive. Explore this power point presentaion to learn about symbiotic relationships. Microsoft Office presentation, powered by Office Online.

Tags Commensalism, Energy flow, Mutualism, Parasitism, Symbiosis

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