Eukaryotic mRNA has a significantly longer half life than its prokaryotic counterpart. How is this
accomplished in eukaryotes? What processes tend to degrade mRNA molecules in both eukaryotes and
prokaryotes, and why are these processes needed? What will be an ideal response?
Concepts to Consider: Eukaryotic mRNA is protected after it is made by the addition of a poly-A tail
and a cap. These additions protect the mRNA from degradation by nucleases that target RNA. These
nucleases are needed to degrade foreign RNA and DNA that enter the cell.
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Cells that can break down bone matrix by secreting enzymes and acids are called ________
a. osteocytes b. osteoclasts c. marrow d. osteoblasts
Concerning the role of the pancreas in digestion,
a. no digestion occurs in the pancreas. b. endocrine cells secrete bicarbonate, which helps neutralize highly acidic chyme. c. endocrine cells release enzymes that break down carbohydrates, fats, proteins, and nucleic acids in the small intestine. d. exocrine tissue produces insulin and glucagon, which help regulate the metabolism of sugar. e. all of these are true.
The products of both the BRCA1 and BRCA2 genes bind to a protein involved in repair of
____________________ (what kind of DNA damage?). Fill in the blank(s) with the appropriate word(s).
What is the general design of the fluid mosaic model?
What will be an ideal response?