Biochemistry Multiple Choice Questions on “Signaling in Microorganisms and Plants”.
1. Which of the following statements about Arabidopsis is not true?
A. In Arabidopsis, CTR-1 Ser/Thr protein kinase is activated by ethylene
B. Activation of MAPK cascade
C. EINI activation
D. Synthesis of ERF1 transcription factor
Answer: A
Clarification: In Arabidopsis, CTR-1 Ser/Thr protein kinase is inactivated by ethylene.
2. The 2-component system drives bacterial chemotaxis by coupling autophosphoryaltion of which receptor to phosphorylation of respective regulatory protein?
A. His kinase
B. Adenylyl cyclase
C. Guanylyl cyclase
D. None
Answer: A
Clarification: The 2-component system drives bacterial chemotaxis by coupling auto-phosphorylation of his kinase to phosphorylation of the respective regulatory protein.
3. Bacteria do not have which of the following receptors?
A. Adhesion receptors
B. Nuclear steroid receptors
C. Membrane proteins
D. GPCR
Answer: B
Clarification: Bacteria/plants do not have nuclear steroid receptors.
4. A factor involved in regulating the fate of stem cells in plant development is _________
A. Adrenaline
B. Epinephrine
C. Thyroid stimulating hormone
D. CLV1
Answer: D
Clarification: Adrenaline, epinephrine and thyroid stimulating hormones are animal hormones.
5. The peptide trigger for the self-incompatibility response that prevents self-pollination is _________
A. Salicylic acid
B. Jasmonates
C. Brassinosteroids
D. Plant peptide hormones
Answer: C
Clarification: Brassinosteroids prevents self-pollination.
6. Autophosphorylation is done on _________
A. His residues
B. Ser/Thr residues
C. Cys residues
D. Lys residues
Answer: B
Clarification: Autophosphorylation is done on Ser/Thr residues.
7. In Arabidopsis flg22 binds to _________
A. FLS2
B. LPS
C. BAK1
D. MAPK
Answer: A
Clarification: flg22 present in plants binds to FLS2.
8. Transcription factor in plants is _________
A. Serine
B. Threonine
C. WRKY22/29
D. Leucine
Answer: C
Clarification: Serine, threonine and leucine are amino acids.
9. Negative regulator of ethylene response is _________
A. LPS
B. CTR1
C. BAK1
D. MAPK
Answer: B
Clarification: CTR1 is the negative regulator of ethylene response.
10. ERF1is a _________
A. Translation terminating factor
B. Positive regulator
C. Translation promoting factor
D. Enzyme inhibitor
Answer: A
Clarification: ERF1 is a eukaryotic translation terminating factor.
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