DNA test mc

protein synthesis order 2

1. dna segment opens (unzips) 2. mrna is formed 3. mrna attaches to ribosomes 4. trna carries amino acids to mrna 5. amino acids form peptide bonds

protein synthesis order 1

1. dna unzips 2. uracil bonds with adenine 3. mrna joins with ribosomes 4. complementary bonding between codon and anticodon

a polypeptide contains 12 amino acids, how many nucleotides would be required in the mrna for it to be translated

36 (12*3=36, amino acid = 1 triplet)

in which direction do the mrna read by the ribosome

5' - 3'

anticodon = AUC, dna triplet is ..

ATC

CGATTACAG transcription occurs and the sequence is now:

GCUAAUGUC

substitution of one base pair in dna by a different base pair during replication

a mutation occurs

dna replication is said to be semi-conservative because

a new double helix contains one new and one old strand

during translation what is the purpose of the poly a tail

acts to stabilize the mrna and allows the strand to survive longer in the cytoplasm

the number of adenine bases in a dna molecule equals the number of thymine bases because

adenine on one strand bonds to thymine on the other strand

dna replication involves the breaking of bonds between

bases

what is the role of trna during translation

carry amino acids to the mrna for correct placement in the protein chain

the anticodon of a particular trna molecule is

complementary to the corresponding mrna codon

two sugars found in nucleic acids are

deoxyribose and ribose

mutation occurs so that okazaki fragments weren't connected, what enzyme is affected

dna ligase

which of the following statements best describes dna replication

dna nucleotides, by complementary base pairing with dna, produce dna

central dogma states that the flow of genetic information is in the direction ..

dna, rna, protein

what kind of chemical bond is found between paired bases of the dna double helix

hydrogen

when replication is complete 2 .... copies of the dna molecule have been produced and the cell is ready to begin ....

identical, cell division

the splicing of the first-formed mrna transcript by spliceosomes is necessary because

introns need to be removed

one of the functions of dna is to

make copies of itself

the product of transcription is

mrna

which of the following is only associated with the lagging strand during dna replication

okazaki fragments

there are two active sites inside the ribosomes what are they called

p site and a site

the chemical bonds in dna by which the sugar components of adjacent nucleotides are linked through the phosphate groups are called ... bonds

phosphodiester

cell components in protein synthesis order

rna polymerase, rna, ribosome, trna