The answer is the fourth one.
Protons are fixed in the nucleus
Answer:
which give the options na
Answer: Plasmid.
A plasmid is a small DNA molecule within a bacteria cell that is separated from the chromosomal DNA and can replicate independently. Through Recombinant DNA, we can insert a gene that we want to see replicated in the plasmid, and when the bacteria multiplies, which it does often, we will obtain a lot of copies of interest gene.
Answer:
E. All of these mechanisms are used; there is no single universal mechanism.
Explanation:
Gene expression is regulated at many levels. Some of them are:
- Chromatin remodeling regulation includes altered histone modifications such as methylation which can regulate gene expression (up or down).
- Transcription is regulated via transcriptional factors and specificity factors such as repressors and activators.
- RNA processing can be regulated through the alternative splicing (different introns can be excised and combinations of different exons connected)
- Post-translational modification refers to modification of proteins after being synthesized.
Nervous system
&
Specialized
I hope that helps, Good luck!