Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is the effect of removing the inhibition caused by DELLA proteins?
decreased transcription of amylase mRNA
inhibition of gibberellin receptors
increased transcription of amylase mRNA
degradation of amylase enzymes
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What happens to DELLA proteins when gibberellins bind to their receptors?
they are activated
they are synthesised
they are degraded
they are transported to the aleurone layer
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Where is the aleurone layer located in a seed?
surrounding the embryo
in the center of the endosperm
on the outer edge of the endosperm
inside the embryo
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How do gibberellins contribute to stem growth?
by stimulating the action of XET enzymes
by strengthening the hemicellulose network
by preventing the separation of cellulose microfibrils
by inhibiting the action of XET enzymes
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Which structure within a seed is the developing plant?
endosperm
starch granules
aleurone layer
embryo
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What does the endosperm of a seed contain before germination?
starch
hemicellulose
glucose
cellulose
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What triggers the synthesis of gibberellins in a seed?
exposure to light
reduction in water levels
presence of amylase enzymes
absorption of water
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Which enzymes are synthesised in response to gibberellins?
xylanases and ligninases
amylases and maltases
cellulases and pectinases
lipases and proteases
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What do amylase enzymes hydrolyse during germination?
lipids into fatty acids
cellulose into glucose
starch into maltose
proteins into amino acids
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How do the sugars produced by starch hydrolysis help the embryo?
they provide energy and support growth
they activate other enzymes
they prevent water absorption
they inhibit further gibberellin synthesis
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