1.1 elements in living organisms

how many out of 100 naturally occurring elements are present in living organisms?

25

what are the 6 most common elements in living things

Carbon hydrogen oxygen nitrogen phosphorus sulfur

Carbon hydrogen and oxygen are found in what organic compounds

Proteins carbohydrates nucleic acids and lipids

What are organic compounds

compounds of carbon

every organic compound in loving organisms contain what

2 or more atoms of carbon

what are the main types of carbon-containing molecules on which life is based

carbohydrates, proteins, lipids and nucleic acids

what elements are present in carbohydrates

C,H,O

What elements are present in proteins

CHONS

what elements are present in lipids

CHO

What elements are found in nucleic acids

CHONP

What are inorganic compounds

any substance that doesn’t contain carbon

about 99% of the human body is made up of what elements

CHON, phosphorus, calcium

what 5 other elements make up the 1% of human bodies

potassium, sulfur, sodium, chlorine, magnesium

what trace elements are needed by animals

iron, copper, cobalt, maganese, zinc

what are minerals present in living tissues in small amounts

trace elements

what is a key trace elements for almost all living organisms bc of metabolism

iron

what is iron essential for

• cell respiration

• energy production

• dna synthesis

• cell division

• forms the hemoglobin molecule

• part of the electron transfer chain that allows eukaryotes to respire

• important component of both respitory proteins and enzymes

what % of the human body does iron take up

0.006%

what do plants need iron for

for chlorophyll to be made

without iro, what cannot take place in plants

photosynthesis

what are toxic elements

substances that contaminate the environment, making them poisonous or harmful

the most hazardous elements are

chromium, nickel, copper, zinc

where do heavy metals come from

they are released from natural sources during the weathering of rocks or volcanic eruptions