Amino acids in polypeptides are joined by what type of bond? a) Hydrogen b) no-Peptide c) Covalent d) Ionic e) Weak Which of the following is a secondary structure often observed in proteins? a) helix b) sheet c) subunit d) helix and sheet e) All of these Which of the following is not a true statement about ribosomes? a) They are structured into large and small subunits b) They are comprised of RNA and protein c) The ribosomes in prokaryotes are typically larger than those found in eukaryotes d) The ribosome subunits associate during the initiation of translation e) All of these are false statements
The Molecular Basis of Mutation Mutations alter the nucleotide sequences of genes in several ways, --the substitution of one base pair for another. (A for T) --the deletion (or addition) of one or a few base pairs. ( AT…….GC)
--DNA-dependent ATPase. --can hold a single strand and double strand together. --DNA synapsis reaction between a DNA double helix and a homologous region of single stranded DNA. --catalyzes branch migration begins.
5) Which of the following is considered a point mutation? 1. Substitution of the base A for the base C 2. Deletion of the base T 3. Insertion of the base G a) 1 b) 2 c) 3 d) 1 and 2 e) All of these Which base pair combinations can form when nitrogenous bases are present in their rare imino or enol states? a) A:T b) C:G c) A:C d) A:T and C:G e) C:G and A:C
Which of the following enzymes performs light dependent repair? a) DNA gyrase b) DNA polymerase c) DNA photolyase d) RNA polymerase e) DNA helicase