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4.1 water as chemical component in cells

Total questions: 20

Worksheet time: 15mins

Name
Class
Date
1.

The smallest unit or part of an element is called .......

a)

an atom

b)

an element

c)

a molecule

d)

a compound

2.

This forms when two or more elements chemically combine

a)

Atom

b)

Element

c)

Compound

d)

Oxygen

3.

Living things need carbohydrates, lipids, proteins and nucleic acids which are part of which group?

a)

inorganic compounds

b)

organic compounds

c)

earthly compounds

d)

water compounds

4.

Which of the following is an example of an INORGANIC compound

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acid

e)

water

5.

Energy rich organic compound, such as sugar or starch, that is made of elements carbon, hydrogen, and oxygen

a)

carbohydrate

b)

lipid

c)

protein

d)

nucleic acid

e)

water

6.

Most chemical reactions in cells depends on substances that must be dissolved in ________ to react.

a)

protein

b)

lipids

c)

water

d)

carbohydrates

7.

This substance is necessary for transporting materials into cell and wastes out of the cell.

a)

water

b)

carbohydrates

c)

nucleic acid

d)

protein

8.

This helps cells keep their shape and size

a)

protein

b)

lipids

c)

carbohydrates

d)

water

9.
Water is the most abundant molecule found in living organisms.  Most mammals, in fact are approximately 70% water by weight.  About two-thirds of this water is present inside cells.  The other one-third is present outside cells (e.g., in blood plasma or other body fluids).  Why is water so important to cells?
a)
Water is stored in the cells to be used when the organism gets thirsty.
b)
Almost all the chemical reactions in life processes occur in solutions with water.
c)
Water determines which proteins are translated from the cellular DNA.
d)
The main structural component found in plasma membranes and cell walls is water.
10.
In order to change from a solid to a liquid to a gas, water must absorb a large amount of heat energy.  
Water can absorb a large amount of energy while producing only small changes in temperature because water has a 
a)
low particle density.
b)
high particle density.
c)
high specific heat.
d)
low specific heat.
11.
Water molecules are ____________ due to _________ bonding. This property helps water molecules to stick to each other and allows for the movement of water from plant roots up to plant leaves.
a)
cohesive; ionic
b)
cohesive; hydrogen
c)
adhesive; hydrogen
d)
adhesive; covalent
12.
The main effect that water has on climate is that extreme temperatures ____________ occur in cities near large bodies of water, because water heats up and cools down very slowly.
a)
never
b)
most often
c)
are more likely to
d)
are less likely to
13.
The freezing point of water is 0oC, and the boiling point is 100oC.  This range of temperatures can be found naturally on the Earth, which means that
a)
water can exist in all three states on Earth.
b)
water has a very low specific heat.
c)
water cannot move through the roots of plants.
d)
water makes up less than 30% of the Earth's surface.
14.
Lakes and oceans are able to stabilize air and land temperatures because
a)
the temperature of water changes significantly instead of the temperature of the air and land.
b)
the salt in the water bodies is able to absorb large amounts of heat.
c)
the water is able to release large amounts of heat into the air when necessary.
d)
water is able to absorb large amounts of heat without significantly changing its temperature.
15.
The attraction between hydrogen and oxygen atoms in different water molecules is known as a(n)
a)
ionic bond.
b)
hydrogen bond.
c)
covalent bond.
d)
dispersion force.
16.
The human body contains approximately 70% water by weight.  Water is found inside and outside of cells, and it is able to carry nutrients into and around cells in addition to carrying wastes away from cells.  Why is water able to do this?
a)
Water is a nonpolar covalent compound.
b)
Water is able to dissolve many substances.
c)
Water is an ionic solution.
d)
Water is very acidic.
17.

Why is water so vital to cells?

a)

Without water most cells would die.

b)

Without water, most chemical reactions within cells could not take place.

c)

Water is key to everything.

18.

If the water is evaporated, the remaining mass i the protoplasm is called...

a)

dry weight of the cell

b)

left over

c)

dry protoplasm

d)

hydrated protoplasm

19.

Which of the following properties of water enables it to move from the roots to the leaves of plants?

a)

Water expands as it freezes.

b)

Water is an excellent solvent.

c)

Water exhibits cohesive behavior.

d)

Water moderates temperature.

20.
Water is the most abundant molecule found in living organisms.  Most mammals, in fact are approximately 70% water by weight.  About two-thirds of this water is present inside cells.  The other one-third is present outside cells (e.g., in blood plasma or other body fluids).  Why is water so important to cells?
a)
Water is stored in the cells to be used when the organism gets thirsty.
b)
Almost all the chemical reactions in life processes occur in solutions with water.
c)
Water determines which proteins are translated from the cellular DNA.
d)
The main structural component found in plasma membranes and cell walls is water.

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