Question
Which gene is directly associated with shoot apical meristem formation ?
The correct answer is
CLAVATA3
Shoot Apical Meristem Gene Regulation
The shoot apical meristem (SAM) is crucial for plant development, generating leaves and stem structures. Its size and function are tightly regulated by specific genes.
Role of CLAVATA3 in SAM Formation
The CLAVATA3 (CLV3) gene is a central regulator of the shoot apical meristem. It encodes a small secreted peptide that acts as a signaling molecule.
- CLV3 signaling helps maintain the balance between stem cell proliferation and differentiation within the SAM.
- It restricts the number of stem cells, preventing uncontrolled growth and ensuring proper meristem size.
- Mutations affecting CLV3 often result in enlarged SAMs, highlighting its essential role in meristem regulation.
Analysis of Gene Association
While several genes contribute to meristem function, CLAVATA3 is directly and primarily associated with the regulation and maintenance of the shoot apical meristem's stem cell population.
- CLAVATA3: Directly involved in SAM size control and stem cell homeostasis.
- RCM1: Primarily associated with root meristem function.
- PTN1: Less directly linked to the core regulation of SAM formation compared to CLV3.
- QC25: Related to the quiescent center, a specific cell type within meristems, but not the primary regulator of the entire SAM.
Therefore, CLAVATA3 is the gene directly associated with shoot apical meristem formation and maintenance.
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Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
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