Unit 1: Chemistry of Life Concept Check

Water molecules are polar covalent because__.

• There is an even pull on electrons

• There is an uneven pull on electrons

• Water is neutral

• Water acts like an acid

A plant uptakes water through capillary action when the _____ overcomes gravity.

• Cohesive attraction between water molecules

• Adhesive attraction between water molecules

• Cohesive attraction between the water and plant

• Adhesive attraction between the water and plant

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Water is considered a universal solvent because ___ .

• The polarity of water allows polar molecules to dissolve and nonpolar molecules to suspend.

• The polarity of water allows nonpolar molecules to dissolve and polar molecules to suspend.

• Water can absorb other chemicals

• Water is used everywhere.

Which of the following is NOT part of the cell theory.

• All cells come from other cells

• All cells contain a nucleus to house DNA

• Cells are the smallest unit of life

• All living things are made up of one or more cells

Tags

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A microscope is used ____.

• To view extremely large items

• To magnify extremely small objects

• The scrape off the tissue layers of muscles

• To take pictures of organisms

In our science classroom, we use a ____.

• Electron Scanning microscope

• Electron Transmission microscope

• Compound Light microscope

• Compound Hand Lens

Write the macromolecule next to the function being described.

• Carbohydrate

• Enzymes, start or increase chemical reactions in cells:

• Proteins

• Stores genetic information:

• Carbohydrates

• Chemical Messengers in and between cells:

• Nucleic Acids

• Used for long term storage of energy:

• Proteins

• Used for structural supports in plants

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Which of the following is an example of a living thing responding to its environment to maintain homeostasis?

• A human sweating to cool down on a hot day

• A rock sitting in the sun

• A car engine overheating

• A book absorbing sunlight

Select the correct diagram that represents a water molecule (H₂O) including its polarity.

• A diagram showing two hydrogen atoms bonded to an oxygen atom with a bent shape and partial charges (δ- on oxygen, δ+ on hydrogens).

• A diagram showing three hydrogen atoms bonded to a nitrogen atom with no polarity indicated.

• A diagram showing two hydrogen atoms bonded to an oxygen atom in a straight line with no charges indicated.

• A diagram showing one hydrogen atom bonded to one oxygen atom with no polarity indicated.

Tags

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A hydrogen bond forms when a hydrogen atom covalently bonded to an electronegative atom is attracted to another electronegative atom. Which diagram best represents a hydrogen bond?

• A dotted line between a hydrogen atom and an oxygen atom of different molecules

• A solid line between two hydrogen atoms

• A double line between two carbon atoms

• A dashed line between two sodium ions