7. Please give answers with detailed explanations. preferentially done by hand o

Question

7. Please give answers with detailed explanations. preferentially done by hand or on computer. Need ASAP and will rate ASAP. less otherwise indicated. 1. Five tRNAs are used in translation. Their anticodons-in the order in which they enter the ribosome-are a follows: 3'-ACA-5 3-UAA-5, 3-UUG-5', 3-AGA-5 and 3-AUG-5. Assuming that the section of mRNA to which these tRNAs bind corresponds to a single exon, what is the sequence of the template gene that transcribed the mRNA? A. 5-TGTATTAACTCTTAC-3 B. 3-TGTATTAACTCTTAC-5 C. 3'-ACATAATTGAGAATG-5 D. 3'-CATTCTCAATTATGT-5 E. 5-CATTCTCAATTATGT-5' 2. The first base at the 3 end of the anticodon of one particular tRNA molecule carrying the amino acid alanine is changed to another base. Which of the following would be the most likely consequence of this alteration? A. Nothing-the altered tRNA would not be functional B. The alanine carried by the altered tRNA would still be inserted into the polypeptide in the correct place C. All alanines will be incorporated into the polypeptide at positions different from that specified by the D. One amino acid in the polypeptide will be replaced by alanine (assuming the altered tRNA is used only E. One alanine in the polypeptide will be replaced by another amino acid due to the degeneracy of the genetic code mRNA codons once) 3. (3 pts) A new form of life is discovered. It has a genetic code much like that of organisms on Earth except that there are six different DNA bases (instead of four) and a codon consists of two bases (instead of three) There is one start codon and one stop codon. The start and stop codons are punctuation only and do not code for an amino acid. Furthermore, each amino acid is specified by exactly two codons each. How many different amino acids could be accommodated by this genetic code? A. 4 B. 12 20 D. E. 32 4. With the onset of mitosis and/or meiosis, the nucleolus "disappears". What causes the nucleolus to disappear? A rRNA genes are reorganized into more condensed forms of chroman. B. A mitotic spindle starts to form. C. The nuclear membrane dissipates. D. The nuclear lamina dissolves. E. Centrosomes start to separate. 5. A new DNA strand only elongates in the 5' to 3 direction because A DNA polymerase begins adding nucleotides at the 5' end B. Okazaki fragments prevent elongation in the 3' to 5' direction. C. The polarity of the DNA molecule prevents addition of nucleotides at the 3' end D. Replication must progress toward the replication fork E. The phosphates at the 5' end of the incoming nucleoside triphosphate provide the energy for the formation of the bond. 6. A man with type AB": MN blood maries a woman with type o N blood. Which of the following blood types would NOT be possible for any child the two? A. B, N B. O, M C. A, MN D. O, MN E. B'. N

Explanation / Answer

the allele present are ;

C - curved hair ,dominant

C+ -recessive ,straight hair

H -spiraled hair - dominant

h -recessive of spiraled

a/a+ -lack of hair { seen at third locus }

1. phenotype of the female mosquito ;

the phenotype of the female will be curved hair which is a dominant allele ,located at the first locus of the gene .

2. Genotype of the male parent ;

c+/c+ ; h/h ; a/a+ ,

c+ represent the straight hair which is a recessive allele ,a no hair , h ,recessive spiraled hair

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