26 Questions
Which group of organisms produce many chemical hormones?
Animals
What are plant hormones also known as?
Phytohormones
How are the effects of phytohormones modulated?
Both by environmental and developmental influences and by the activities of other phytohormones
Which hormone influences the time at which a plant flowers?
Brassinosteroid
What effect does the uzu mutant of barley have?
It makes the plant higher yielding
Which type of plants have the decision to flower most thoroughly studied?
Annual plants
Which enzyme catalyzes the rate-limiting step of ABA synthesis?
Auxin
How do hormones exert their influence on target cells?
By binding to receptor proteins
Which proteins are generally well characterized in hormone transport?
Proteins involved in auxin transport
What is the role of protein kinases in hormonal signaling?
They add phosphate groups to proteins
Which term is commonly used to describe small chemical messengers in plants?
Hormone
Which of the following is NOT one of the five classical plant hormones?
Salicylates
What is the role of plant hormones in the plant lifecycle?
They affect all phases of the plant lifecycle
How are hormone levels in plants controlled?
Hormone levels are controlled by their rate of catabolism
Which hormone promotes lateral organ initiation at the shoot apex?
Auxin
Which hormone maintains the stem cell population at the root apex?
Auxin
What is the function of strigolactones in shoot branching control?
Inhibit bud outgrowth
What is the effect of the recessive le allele on plant height?
Causes plants to be short
Which compound is the most active and well characterized in the family of gibberellins?
Gibberellic acid (GA3)
What is the function of gibberellins in plant growth and development?
All of the above
Which gene encodes an enzyme in the GA biosynthetic pathway and is responsible for the semidwarf phenotype in rice?
Reduced height1 gene
What is the role of brassinosteroids in plant growth and development?
Promote cell elongation
Which of the following is true about auxin?
Auxin is synthesized from the amino acid Trp
What was the influence described by Charles Darwin and his son Francis in their book?
The influence of lateral light on plant bending
What is the role of auxin distribution in embryonic pattern formation?
Auxin forms the root stem cell population
How does auxin regulate gene expression?
Auxin binds to TIR1 and prevents proteolysis of Aux/IAA proteins
Test your knowledge on gibberellins, a family of compounds that play a crucial role in plant growth and development. Explore their synthesis, degradation, and the impact of key enzymes in regulating their accumulation. Discover the fascinating origins of gibberellins and their connection to a fungal pathogen.
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