Answer:
a. the RNA polymerase undergoes abortive initiation prior to promoter clearance
Explanation:
In eukaryotes the 3' end of the mRNA is polyadenylated to protect the mRNA from degradation.
In eukaryotes, a modified guanine cap is added to the 5' end of the mRNAd to protects the transcript from being broken down.
Most bacterial RNA transcripts do not undergo splicing.
The nucleosome is the basic unit of chromatin repeat in eukaryotes.
Image result for Where does respiration occur in earthworms Respiration I. Earthworms
In earthworms there is no specialized organ to do respiration. So, in earthworms respiration process takes place through its moist, thin and highly vascular skin. The oxygen gas absorbed by the skin diffuses into the blood and transported to all the cells of the body.
6. a, 7. c, 8. b , 9. e , 10. d , 11. e, 12.c
<span>Carbon has four valance electrons.
Carbon forms the backbone of all organic molecules.
Carbon can form bonds with four different atoms.
Carbon can from four covalent bonds with another carbon atom.</span>
