Biological worksheet

Screening for Drug Use in General Medical Settings Biological Specimen Testing Introduction to Biological Testing Urine drug testing is the most common toxicological test of body fluid samples in general medical settings, but you do not need to have a biological testing program to implement a drug screening program.

Biological worksheet

All key components of every living cell are made of macromolecules. The four kinds of macromolecules are lipids, carbohydrates, nucleic acids, and proteins. Most macromolecules are polymers constructed of many organic molecules called monomers. Students start with images of living organisms, from bacteria to plants and animals.

Biological worksheet

They zoom into cells and tissues to discover that they are made of different macromolecules. Students observe that these macromolecules are polymers.

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They zoom into polymers to find that some are made from almost identical monomers, while others, such as proteins, are made from a set of different monomers. They discover that all monomers making up biological macromolecules are composed of just a few types of chemical elements: Students will be able to: Identify typical molecular building blocks monomers that form biological macromolecules.

Determine the types of atoms that make up most biopolymers. Reason about the uniformity on the atomic level of life's molecular building blocks Macro to Micro Connection Students connect living organisms to their atomic and molecular composition.

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Conceptual Prologue Life's Macromolecules All cells, organs and tissues of a living organism are made of atoms and molecules. A special class of very large molecules that determine the structural and functional properties of living cells are called biologically - active macromolecules.

They are called "macro" for their very large size relative to other organic molecules. Commonality in life's macromolecules The monomers that link together to form polymers are made of very few elements.

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Some of them, such as C, H, O, N, P and S also called macro elements make up biomolecules and are therefore the largest dry weight of all living organisms. Other elements are present in very small quantities, but can still play important roles e.

Here is one way to think of the commonalities in atomic composition: All carbohydrates such as wood or starch in every plant are made of just three chemical elements: C, H and O. All proteins of all organisms on earth are made of five chemical elements: Here we see a uniformity of living organisms at the most elemental level.

The uniformity continues at the level of monomers as well. In this activity students trace a number of biological structures from their appearance in our macro world to their monomers.

When they compare proteins of different organisms e. They discover that there is even less diversity in carbohydrates, most of which are made from just one monomer, glucose. That is why all cellulose fibers tend close-up to look alike whether taken from carrot or baobab treewhile proteins can be different.

Only one family of monomers is used to make a specific class of polymers; there are no polymer chains in which amino acids and nucleotides are interlinked.

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Types of Polymers Polymers can be divided into those in which the building blocks are all the same homopolymersand those in which there is a variety of building blocks heteropolymers.

Some biological polymers such as cellulose are made of a large number of identical connected glucose molecules, monomers, and are considered homopolymers.Pollution is the presence of unwanted substances in an environment.

It is often the result of human interference.

Biological worksheet

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Biological Specimen Testing Introduction to Biological Testing Urine drug testing is the most common toxicological test of body fluid samples in general medical settings, but you do not need to have a biological testing program to implement a drug screening program.

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