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