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Integrated Science — First Secondary

Integrated Science — First Secondary

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Question bank: Module 5 — The Biological Importance of Water: Cells, Metabolism and Enzymes

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  • Questions count: 40
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1.
The most abundant chemical substance in living organisms is
protein
carbohydrate
water
lipid
2.
Water forms approximately what percentage of the body mass of a mammal?
20 %
45 %
70 %
95 %
3.
Of the body mass of a mammal, the percentage of water found inside the cells is about
23 %
47 %
70 %
10 %
4.
Blood plasma is an example of water found
inside cells
outside the cells
in the nucleus
in chloroplasts
5.
The structural and functional unit of all living organisms is the
tissue
organ
cell
molecule
6.
A prokaryotic cell is one whose genetic material
is enclosed by a nuclear membrane
is not surrounded by a nuclear membrane
is absent
is in the mitochondria
7.
Which of the following is a prokaryote?
yeast
amoeba
bacterium
alga
8.
The bacterial cell wall contains
cellulose
chitin
peptidoglycan
lignin
9.
Cell walls of fungi are made of
cellulose
chitin
peptidoglycan
keratin
10.
Which kingdom has no cell walls, is multicellular and heterotrophic?
plants
fungi
animals
protista
11.
A multicellular autotrophic organism with a cellulose cell wall is a
fungus
plant
animal
bacterium
12.
Which of the following is an invertebrate?
frog
starfish
tilapia
dolphin
13.
Which of the following is a vertebrate?
jellyfish
clam
shark
sponge
14.
The semi-permeable structure surrounding all cells is the
cell wall
plasma membrane
nuclear membrane
vacuole
15.
The gel-like substance of the cell, mostly water, is the
nucleus
cytoplasm
mitochondrion
chloroplast
16.
The organelle that controls the cell's activities and contains genetic material is the
vacuole
nucleus
ER
cell wall
17.
The organelle that carries out photosynthesis is the
mitochondrion
chloroplast
ribosome
vacuole
18.
Vacuoles in plant cells are
few and large
numerous and small
absent
found only in the nucleus
19.
The energy-production centres of the cell are the
chloroplasts
mitochondria
vacuoles
cell walls
20.
Dysfunction of mitochondria leads directly to
a decrease in ATP production
failure of transpiration
loss of the cell wall
a rise in photosynthesis
21.
The network of membranes used to transport materials inside the cell is the
endoplasmic reticulum
cell wall
chloroplast
vacuole
22.
Which structure is found in plant cells but not in animal cells?
nucleus
mitochondria
chloroplasts
cytoplasm
23.
Which is NOT a general role of water in organisms?
solvent for biochemical reactions
transport of gases and wastes
storage of genetic information
helping in temperature stability
24.
Water helps living organisms maintain a stable internal temperature mainly because of its
high specific heat
low density
high pH
white colour
25.
Metabolism includes
catabolism only
anabolism only
both catabolism and anabolism
neither
26.
In catabolic reactions complex molecules are
built up with energy consumption
broken down with energy release
unchanged
converted to water only
27.
An example of an anabolic process is
respiration
photosynthesis
digestion of starch
sweating
28.
The synthesis of proteins from amino acids is
catabolic and releases energy
anabolic and consumes energy
a physical change
a nuclear reaction
29.
In cellular respiration the products from glucose are
CO₂ and H₂O
O₂ and H₂O
starch and O₂
protein and CO₂
30.
Activation energy is
the energy released by a reaction
the minimum energy needed to start a reaction
the energy of light
the energy of the enzyme
31.
Enzymes speed up reactions by
raising the temperature of the cell
lowering the activation energy
increasing the energy released
being consumed
32.
Enzymes are made of
lipids
carbohydrates
proteins
minerals
33.
In the "lock and key" model the "key" is the
active site
substrate
product
water
34.
At the end of an enzyme-catalysed reaction the enzyme
is destroyed
remains unchanged
turns into the product
turns into water
35.
Which of the following directly slows an enzyme's activity?
increasing the number of mitochondria
raising temperature far above the optimum
the presence of abundant substrate
enlarging the vacuole
36.
The effect of water on metabolic reactions is best described as
it is a medium in which biochemical reactions occur
it stores energy directly
it stops enzyme activity
it forms the plasma membrane
37.
If the nuclear membrane were removed from a eukaryotic cell it would resemble
a bacterium
a plant
a fungus
an alga
38.
Cell walls of plants are permeable to
water and salts
nothing
only gases
only proteins
39.
Which kingdom includes yeast?
fungi
plants
animals
bacteria
40.
A protist that is autotrophic is
amoeba
golden alga
paramecium
yeast
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