Well the first difference is that PMS is mostly a psychological and somewhat physical syndrome. The proof is that the symptoms of PMS are irritability, stress and dysphoria. There is of course a lot of other symptoms like anxiety, insomnia, headache, fatigue, mood swings, and increased emotional sensitivity. The cause of PMS are the changes in levels of estrogen and progesterone. Now, menstrual cramps are physical condition. The symptom is pain in lower abdomen. And the cause is the menstruation itself. So there you have the differences. PMS as its own name says (Premenstrual syndrome) occurs before menstruation, more accurately 5 - 10 days before menstruation which is luteal phase of menstrual cycle. Menstrual cramps can occur several days before menstruation or can occur when menstruation starts, and they slowly disappear as menstruation slowly ends
        
             
        
        
        
A. Inserting recombinant DNA into a host genome produces a transgenic organism.
        
             
        
        
        
Transcription and splicing only occur in eukaryotic cells. Transcription and splicing both occur in the nucleus.
Explanation:
Transcription is mediated by RNA polymerases that transcribe the DNA into RNA. In eukaryotes, because coding regions (exons) on the DNA are occasionally interspersed with non-coding regions (introns), the formed RNA (usually called nascent RNA) need to be spliced to remove the non-coding parts. This forms a mature messenger-RNA. All this occurs in the nucleus of eukaryotic cells and only after the mature mRNA is formed is it exported to the cytosol for translation into proteins by ribosomes. 
Splicing does not occur in prokaryotic cells because their genome is all composed of coding regions. Therefore transcription on DNA produces, directly, a mature mRNA.   
Learn More:
For more on transcription and splicing of RNA check out;
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NADH and FADH2 cycle is responsible for the production of small amount of energy in the form of ATP.
<h3>What occur in the NADH and FADH2 cycle? </h3>
FADH2 and NADH are created through reduction-oxidation reactions in the Krebs cycle. This cycle produces small amounts of energy in the form of adenosine triphosphate (ATP), and also responsible for the production of compounds i.e. FADH2 and NADH. NADH produces 3 ATP whereas FADH2 produces 2 ATP molecules
So we can conclude that NADH and FADH2 cycle is responsible for the production of small amount of energy in the form of ATP.
Learn more about Kreb's cycle here: brainly.com/question/1770424
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