#Question id: 11720
#Unit 6. System Physiology – Plant
The embryo, which will grow into the new seedling, has a specialized absorptive organ that is___
#Question id: 11721
#Unit 6. System Physiology – Plant
The induction of α-amylase synthesis in barley aleurone layers by gibberellin, given some statements about after the induction of GA into the aleurone layer, and allows some transcriptional gene function inside the nucleus such as;
a) GA-MYB is a negative regulator of α-amylase transcription
b) The sequence of the gibberellic acid response element
(GARE) in the α-amylase gene promoter is similar to the DNA sequence to
which MYB proteins bind.
c) Synthesis of GA-MYB mRNA begins to increase as early as 1
h after gibberellin treatment, preceding the increase in a-amylase mRNA by
several hours
d) A mutation in the GARE that prevents MYB binding also
prevents α-amylase expression.
e) GA-MYB can therefore be defined as a primary or early response
gene, while the α-amylase gene is a secondary or late response gene
f) The secretory pathway requires GA stimulation of the
calcium-calmodulin– independent pathway.
Which of the following statements is incorrect about this transcriptional gene?
#Question id: 11722
#Unit 6. System Physiology – Plant
The induction of GA-MYB and α-amylase mRNA by GA3, the
production of GA-MYB and α-amylase mRNA has shown in graph,
which of the following is the correct representation relation between these two
mRNA .
#Question id: 11723
#Unit 6. System Physiology – Plant
During the α-amylase secretion pathway, a mutation will be found in the sequence of gibberellic acid response element (GARE) the what will caused;
#Question id: 11724
#Unit 6. System Physiology – Plant
At the subcellular level, starch is stored in amyloplasts in
the endosperm of cereals. Two enzymes responsible for initiating starch
degradation are α- and β-amylase
a) α-Amylase hydrolyzes starch chains internally to produce
oligosaccharides consisting of α(1,4)-linked glucose residues
b) β-Amylase degrades these oligosaccharides from the ends to
produce maltose, a disaccharide
c) α-Amylase degrades these oligosaccharides from the ends to
produce maltose, a disaccharide
d) α-Amylase
hydrolyzes starch chains internally to produce oligosaccharides consisting
of β(1,4)-linked glucose residues
e) β-Amylase also converts maltose to glucose
Which of the following combination from the above statements is correct?
#Question id: 11725
#Unit 6. System Physiology – Plant
Given some statements about the roles of phytochrome and
gibberellin in shade avoidance response;
A) In direct sunlight, red light predominates and the Pfr
form of phytochrome moves into the nucleus.
B) Under a plant canopy, the light is enriched in far-red
wavelengths. Phytochrome is in the inactive Pr form.
C) As PIF proteins accumulate, PIF-induced gene expression increases,
promoting stem elongation.
D) Phy causes the turnover of PIF proteins, which act as
negative regulators of
photomorphogenesis
E) In the absence of Pfr, PIFs are not degraded, the
sensitivity to gibberellin increases, causing the degradation of DELLA
repressors
F) As a result, DELLA repressors bind PIF and prevent the
transcription of PIF-regulated gene, In the absence of PIF-induced gene
expression, stem growth is limited.
Find out the correct sequence of these responses.