Bacteria that carry a nonsense mutation in an essential gene can survive if they also possess a suppressor tRNA that is capable of inserting an amino acid at the site of the premature stop codon
How are such bacterial strains capable of terminating at the normal stop codons in the rest of the polypeptides?
What will be an ideal response?
Ans: Suppression is not efficient because suppressor tRNAs must compete with release factors that cause chain termination at the stop codons in most other polypeptides.
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a. the nucleus b. chromoplasts c. rough endoplasmic reticulum d. the central vacuole e. chloroplasts
The first embryonic blood cells come from
a. the amnion. b. the inner cell mass of the blastocyst. c. the yolk sac. d. the chorion. e. the placenta
In what type of tissue would platelets be found?
A) epithelial tissue B) muscle tissue C) nervous tissue D) connective tissue
How would the cDNA created in a lab compare to the original DNA?
A) It would contain only the genes that were producing proteins in the cell at the time the cDNA was created. B) It would be identical to the original DNA. C) It would be a single strand instead of the original double-stranded DNA. D) It would be circular, similar to bacterial DNA.