How is the single-stranded mRNA that leaves the nucleus translated into proteins?
What will be an ideal response?
Ribosomes have two subunits (large and small) that are composed of proteins and rRNA. The small subunits binds to the mRNA followed by the large subunit which sandwiches the mRNA. The tRNA (contains the anticodon and associated amino acid) binds to the complementary mRNA. A second tRNA arrives for the next codon and, via dehydration synthesis, a peptide bond is formed between amino acids, which releases the first tRNA from the mRNA and allows the next tRNA to bind. This process continues until the stop codon is reached.
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Which of the following is not correct for the sigmoid arteries?
A) They traverse the sigmoid mesocolon. B) They help to form the marginal artery. C) They arise from the inferior mesenteric artery. D) They typically divide into ascending and descending branches. E) They are the main source of blood to the left ureter.
Insulin is taken up, via endocytosis, by the endothelial cells that line blood capillaries. Then, it's transported across the cell to the other side, where it is released. This transport is called ________.
A. facilitated transport B. pinocytosis C. passive transport D. receptor-mediated phagocytosis E. transcytosis
A person exposed to hepatitis is given a shot of gamma globulin (an antibody against hepatitis) to keep him from coming down with the disease. This is an example of:
a. natural active immunity b. natural passive immunity c. artificial active immunity d. artificial passive immunity
Adding one mole of NaCl to one liter of water will lower the water concentration twice as much as adding one mole of glucose.
Answer the following statement true (T) or false (F)