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?

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 ?

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