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Which of the following statement is NOT true of enzymes? They
AAre proteins
BNeed cofactors to activate them
CAre sensitive in their action
DAre specific in their action
ECan withstand high temperature
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Question 1134
jamb1984
Osmosis can be defined as the movement of
AMolecules from solution of higher concentration to low concentration
BMolecules from solution of low concentration to high concentration
CWater from solution of high concentration to low concentration
DWater across a semi-permeable membrane from solution of low concentration to high concentration
EWater across a semi-permeable membrane from solution of high concentration to low concentration
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Question 1135
jamb1984
The mammalian organ through which nourishment and oxygen diffuse into a developing embryo is called
AAmnion
BChorion
CUmbilical cord
DOviduct
EPlacenta
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Question 1136
jamb1984
A mixture of mercurous and mercuric nitrates is added to a food substance. A white precipitates is formed which on gentle heating turns red. The food substance is
AProtein
BOil
CCarbohydrates
DFat
EFatty acid
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Question 1137
jamb1984
The character-producing factors in living organisms are
AChromomeres
BAlleles
CChromatids
DChromosomes
EGenes
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Question 1138
jamb1984
Which of the following cell constituents is NOT common in both plants and animals?
AMitochondria
BChloroplast
CRibosomes
DGolgi apparatus
EVacuoles
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Question 1139
jamb1984
Which of the following is INCORRECT? The prothallus of a fern
AIs flattened heart-shaped structure
BIs green because its cells contain chloroplasts
CIs the dominant plant
DBears the sexual organ
EIs attached to the ground by numerous rizoids
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Question 1140
jamb1984
Which of the following invertebrates does NOT possess antennae?
ACentipede
BCrustacean
CMillipede
DInsect
ESpider
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Question 1141
jamb1984
Spirogyra and mucor can be grouped together as Thallophyta because
AThey are unicellular organisms
BTheir spores could be dispersed by wind
CThey are capable of living independent lives
DThey reproduce sexually only
ETheir bodies are made up of thallus and filaments alternatively
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Question 1142
jamb1984
Mosses, liverworts and ferns can be grouped together because they
AAre all aquatic plants
BAll grow in deserts
CAre seedless plants
DHave undifferentiated plant bodies
EAll produce colourless flowers
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Question 1143
jamb1984
The male toad differs from the female by having
AVocal sacs
BShorter hind limbs
CLonger fore limbs
DBulging eyes
ENictating membranes
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Question 1144
jamb1984
The mouth parts of the housefly are adapted for
ALapping and sponging
BSucking and chewing
CPiercing and sucking
DChewing and lapping
EBiting and chewing
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Question 1145
jamb1983
Which of the following will not allow osmosis to take place
Apig's bladder
Bcellophane
Cparchment paper
Dtransparent polythene
Ecow's bladder
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Question 1146
jamb1983
If an isolated living cell is left in distilled water for two hours, it is likely to
Alose some of its water to the surrounding water
Blose all of its water to the surrounding water
Creproduce by binary fission
Dbecome more turgid
Edie due to excess water
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Question 1147
jamb1983
Which of the labelled part in the figure above will develop into new bulb?
A1
B4
C2
D3
E5
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Question 1148
jamb1983
The main function of 4 is to
Asurround inner tissues
Bproduce cork
Cproduce root hairs
Dproduce lateral roots
Eproduce more of 3
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Question 1149
jamb1983
The main function of 6 is to
Aseparate 5 from 7
Bproduce more of 5 and 7
Cproduce cork
Dtranslocate water and mineral salt
Econduct carbondioxide to the other plant
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Question 1150
jamb1983
Which of the following features can be used to identify the figure above
