Nuclear maturation encompasses nuclear envelope breakdown, meiotic spindle assembly, and chromosome segregation. Cytoplasmic maturation involves major changes in oocyte protein translation and cytoplasmic organelles and is poorly understood.
In the nematode Caenorhabditis elegans, sperm release the major sperm protein (MSP) hormone to promote oocyte growth and meiotic maturation.
Large translational regulatory ribonucleoprotein (RNP) complexes containing the RNA-binding proteins OMA-1, OMA-2, and LIN-41 regulate meiotic maturation downstream of MSP signaling.
To understand the control of translation during meiotic maturation, we purified LIN-41-containing RNPs and characterized their protein and RNA components. Protein constituents of LIN-41 RNPs include essential RNA-binding proteins, the GLD-2 cytoplasmic poly(A) polymerase, the CCR4-NOT deadenylase complex, and translation initiation factors.
RNA sequencing defined mRNAs associated with both LIN-41 and OMA-1, as well as sets of mRNAs associated with either LIN-41 or OMA-1. Genetic and genomic evidence suggests that GLD-2, which is a component of LIN-41 RNPs, stimulates the efficient translation of many LIN-41-associated transcripts.
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Evolution, allowed birds to survive in various climates
didnt understand the question, but the answer i think would be
The eukariotic cell cycle
Adrenergic modifiers bind to epinephrine receptors while
cholinergic modifiers bind to ACh receptors. Either of these drugs will inhibit
the natural ligand actions or mimic the natural ligand molecules when it binds to the
receptor.
Epinepherine can be classified as adrenergic, even though it is a
natural ligand (chemical). Pilocarpine is a good example of a cholinergic
chemical.
Answer:
The kind of feedback loop described above is:
a negative feedback loop.
Explanation:
A negative feedback loop causes homeostasis. A negative feedback loop tends to stabilize the ecosystem, creating some balance. Positive feedback loops, on the other hand, enhance or amplify changes, moving the system away from its equilibrium state, and making it unstable. With negative feedback loops, changes are dampened or buffered. This causes the system to maintain some equilibrium or remain in a stable state. All homeostatic systems, such as thermoregulation (which regulates the body temperature) and blood sugar regulation, operate on negative feedback loops.
