Cell and molecula

Which of the following statements is true ?
DNA molecules are in the shape of a double helix
Each DNA molecules is a single gene
RNA molecules are in the shape of a double helix
Which 2 molecules forms the side(backbone) of the DNA ladder?
Deoxyribose (sugar)and phosphate
Deoxyribose (sugar)and a hydrogen bond
Deoxyribose (sugar)and adenine
DNA nucleotides have three components, which one of these is not part of a DNA nucleotide ?
A nitrogenous base
Ribose sugar
Deoxyribose sugar
Phosphate
5'-AAAGTTCCGTGACT-3' is the sequence read by one strand of DNA; the complementary strand would read
3’-TTTGAACCGACTCA-5’
3’-UUUCAAGGCACUGA-5’
5’-TTTCAAGGCACTGA-3’
3’-TTTCAAGGCACTGA-5’
What strand develops continuously in the replication fork's direction of motion?
Replication strand
Lagging strand
Leading strand
RNA strand
Which enzyme creates a new DNA strand by binding to a primer?
Helicase
DNA polymerase
Primase
RNA polymerase
Which direction does DNA replication occur in?
3' to 5'
Vary from organism to organism
5' to 3'
Any direction
What strand continuously grows in the opposite direction as the replication fork moves?
Replicating strand
DNA strand
Lagging strand
RNA strand
What is the name for the newly created DNA fragments on the lagging strand?
Nitrogenous bases
Leading strand
Polymer gaps
Okazaki fragment
What enzyme will solve or seal up DNA strand during replication?
Ligase
Primase
Binding proteins
Helicase
During DNA replication, which of the following enzymes keeps the two strands apart?
Helicase
Topoisomerase
DNA polymerase
DNA primase
Genes are made up of:
DNA
RNA
Protein
Enzymes
What is the protein that cut the introns out and join the remaining exons together?
Spliceosomes
Operator
Promoter
RNA polymerase
Amino acids are linked to each other by______bond
Chemical
Covalent
Peptide
Hydrogen
How many amino acids will be coded by these sequences of nucleotides: AUGGGAACU?
5
3
12
6
The triplet of bases on the end of a tRNA molecule is:
Protein
Amino acid
Anticodon
Codon
The codon is located on the:
MRNA
TRNA
RRNA
DNA
During which step of translation does the polypeptide grow as the rRNA moves along the mRNA reading codons?
Elongation
Termination
Initiation
Transcription
The process of making RNA from a gene's DNA sequence is called?
transcription
Translation
RNA processing
Replication
The expressed sequences of eukaryotic mRNAs are known as:
Intron
Exon
Intervening sequences
Mature mRNA
The “on/off” switch for an operon is a/an:
Structural gene
Operator
Promoter
Repressor
What is the correct order of genes in an operon?
Promoter, operator, structural genes
Operator, promoter, structural genes
Promoter, structural genes, operator
RNA polymerase, repressor, structural genes
Which constitutes a codon?
A free-floating base that attached to an open DNA strand
The strong bond between two complementary nitrogen bases
The genetic code word of three bases on mRNA that specify one amino acid
Proteins are classified based to their structure into:
5 levels
4 levels
Insulin is the:
Regulatory protein
Structural protein
Catalytic protein
Protective protein
The function of protein depends on its:
Structure
Bond
Chain
Protein denaturation can be caused by:
Heat, Extreme pH, detergent
Extreme pH, detergent, nutrient
Temperature, oxygen, nutrient
Temperature, water, extreme pH
Which of the followings is in the catalytic protein:
Hexokinase
Hemoglobin
Histone
Collagen
Based on biological function, proteins are classified into:
7 types
6 types
How many enzymes that have in DNA replication ?
5
4
3
6
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