Question

19. How many codons are needed to specify three amino acids? a. 3 b. 6 C. 9 d. 12 20. One similarity between DNA and messenger RNA molecules is that they both contain a. The same sugar b. Genetic codes based on sequences of bases C. A nitrogenous base known as uracil d. Double-stranded polymers 21. Some events that take place during the synthesis of a specific protein are listed below. a. Messenger RNA attaches to a ribosome. b. DNA serves as a template for RNA production C. Transfer RNA bonds to a specific codon. d. Amino acids are bonded together. e. RNA moves from the nucleus to the cytoplasm. The correct order of these events is a. B, E, A,C,D b. D, A, E, C,B CB, C, E, D, A d. C, B, A, E, D 22. What is the complementary messenger-RNA sequence for the DNA sequence shown below? C-A-A-G-G-T a. C-A-A-G-G-U b. G-T-T-C-C-A CG-U-U-C-C-A d. C-A-A-G-G-T

Answer 1

19. A) 3

1 coden encodes 1 amino acid hence 3 codens are needed for three amino acids

20. B) genetic codes based on sequence of bases

21. A) B , E,A, C ,D

initial step is mRNA synthesis using DNA as template and it will be translocated to cytoplasm and binds with ribosome and translated into protein

22. C) G U U C C A