If eukaryotes have monocistronic genes, why is the number of known proteins more than the number of known genes?   A. Post-translational modification B. Alternative splicing C. Base substitution D. Post-transcriptional modification

You are working in the lab and have measured the size of mRNA that has been transcribed from a particular gene in your cell population. The length of the gene in the cells you are working, measured from the start to the stop sequence is 9000 nucleotides. When you measure the RNA, however, the size is only 3000 nucleotides. What do you think happened? O a. Three DNA base pairs code for one RNA nucleotide. b. mRNA does not contain exons. c. There must have been a deletion mutation in the DNA in these cells. Od. The poly-A tail is present in the DNA but not on the mRNA. Oe. RNA splicing occurred, so introns are removed in the mRNA.

Table of the Standard Genetic Code Middle base 5'- C_-3' UCU Ser (S) |UAU Tyr (Y) UCC Ser (S) UAC Tyr (Y) UCA Ser (S) UCG Ser (S)UAG Ter CCU Pro (P) CAU His (H) CCC Pro (P) CCA Pro (P) CAA GIn (Q) CCG Pro (P) CAG GIn (Q) 5'- _U -3' 5'-_A_-3' 5'-_G_-3' 5'-U_-3' UUU Phe (F) 5'-U_-3' UUC Phe (F) 5'-U_-3' |UUA Leu (L) 5'-U_-3' UUG Leu (L) 5'-C_-3' |CUU Leu (L) 5'-C_-3' |CUC Leu (L) 5'-C_-3' CUA Leu (L) 5'-C_ -3' CUG Leu (L) UGU Cys (C) 5'-_U-3' 5'-_C-3' 5'-_A-3' UGG Trp (W) 5'-_G-3' 5'- U-3' 5'-C-3' 5'-_A-3" 5'- G-3' 5'- U-3' 5'-_C-3' 5- А-3' 5'-_G-3' GCU Ala (A) GAU Asp (D) GGU Gly (G) 5'-_U-3' 5'-C-3' GGA Gly (G)5'-_A-3' GGG Gly (G) 5'-_G-3' UGC Cys (C) UGA Ter UAA Ter CGU Arg (R) CGC Arg (R) CGA Arg (R) CGG Arg (R) ACU Thr (T)|AAU Asn (N) AGU Ser (S) AAC Asn (N) AGC Ser (S) AGA Arg (R) AGG Arg (R) CAC His (H) 5'-A_-3' |AUU lle (1) 5'-A_-3' AUC Ile (1) 5'-A_-3' |AUA lle (1) 5'-A_-3' |AUG Met (M) ACG Thr (T) AAG Lys (K) 5'-G_-3' GUU Val (V) 5'-G_-3' GUC Val (V) 5'-G_-3' GUA Val (V)…

What did the Hershey / Chase experiments (above) demonstrate about the molecules responsible for genetic inheritance patterns in the T2 bacteriophage? A. the genetic material consists of carbohydrates, not RNA B. the genetic material consists of protein, not lipids C. the genetic material consists of DNA, not polypeptides D. the genetic material consists of protein, not DNA E. the genetic material consists of lipids, not polypeptides

Transposition is a process in which a discrete DNA entity can move between DNA sites that lack homology using a self-encoded protein called a: a. kinase b. transposase c. mobilase d. recombinase

A fragment of DNA has the sequence 5'-ATCCGCT-3'. Following DNA replication, the complementary strand is 3'-TAAGCGA-5'. What type of mutation occurred? a. Frameshift b. Transversion c. Pyrimidine dimer d. Transition

Transcription factors a. help the RNA polymerase bind DNA b. are involved in chromatin remodeling, uncoil the DNA c. modulate transcription from the distance d. add the 5’ CAP to the RNA