Exposure of Zebrafish Nuclei to Meiotic Cytosol Resulted in Phosphorylation

question 40

Multiple Choice

Exposure of zebrafish nuclei to meiotic cytosol resulted in phosphorylation of NEP55 and L68 proteins by cyclin-dependent kinase 2. NEP55 is a protein of the inner nuclear membrane, and L68 is a protein of the nuclear lamina. What is the most likely role of phosphorylation of these proteins in the process of mitosis?

• A) They enable the attachment of the spindle microtubules to kinetochore regions of the centromere.
• B) They are involved in the disassembly and dispersal of the nucleolus.
• C) They are involved in the disassembly of the nuclear envelope.
• D) They assist in the movement of the centrosomes to opposite sides of the nucleus.

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Definitions:

Protons

Positively charged particles found within atomic nuclei that, along with neutrons, define the atomic mass.

Electrons

Subatomic particles with a negative charge, orbiting the nucleus of an atom and involved in chemical bonds and electricity.

Hydrogen Bonds

Weak bonds that form between a hydrogen atom in one molecule and a more electronegative atom, such as oxygen or nitrogen, in another, playing critical roles in the structure of DNA and proteins.

Ionic Bonds

Ionic bonds are chemical bonds formed between two atoms when one atom transfers electrons to another, resulting in oppositely charged ions that attract each other.