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WorksheetsBiology Unit 3 AOS 1 Headstart Revision
Total questions: 16
Worksheet time: 24mins
Draw a DNA molecule with 5 base pairs
Justify if this is a nucleotide from DNA or RNA?
A particular DNA double helix is 100 nucleotide pairs long and contains 40 cytosine bases. The number of adenine bases in the DNA double helix would be
10
20
40
60
A strand of DNA reads 3' TAC GAA TTT CTC GAG CAT 5' the complimentary mRNA strand would read (a)
Consider the DNA sequence GTC. Using the following codon table, find the corresponding codon.
GTC
GUC
CAG
CUG
The amino acid coded for by the template DNA sequence GTC is
Asn
Gln
Val
His
Thirty GTC repeats would code for
30 amino acids.
20 amino acids.
10 amino acids.
90 amino acids.
Bacteria, viruses, humans, and koalas all use the same triplet code to produce proteins. Which property of the genetic code does this refer to?
universal
degenerate
unambiguous
non-overlapping
Gene expression involves the
formation of functional gene products such as proteins or non-coding strands of RNA.
process of translation, followed by transcription, and then RNA processing.
The locations for the processes of transcription and translation occur in the
nucleus and cytosol, respectively.
cytosol and nucleus, respectively.
Fill in the blanks with the following terms. Terms may be used multiple times or not at all. • template strand
• coding strand
• 3’ poly-A tail
• anticodons
• pre-mRNA
• codons
• triplets
• mRNA
To create protein from genetic information, a cell must undergo a series of steps. The first is transcription, where the DNA ___ is read and transcribed into ___. However, it must be processed before translation by splicing introns and the addition of a 5’ methyl-G cap and a ___. The mRNA can now be translated. This is possible due to its sequences of three nucleotides in the mRNA known as ___. At the ribosome, mRNA is used to create a protein.
(a)
Consider the template strand of the hypothetical gene shown. The exons are in bold.
The DNA triplet TAC indicates START for transcription, and the mRNA codon that it produces will code for the amino acid methionine, which remains in the resulting polypeptide. The DNA triplets ATC, ATT, and ACT code for a STOP instruction.
Identify the total number of amino acids present in the polypeptide expressed by this gene.
12
6
7
10
Label the following structures
Fill in the blanks with the following terms. Terms may be used multiple times or not at all.
• repressor proteins
• structural proteins
• RNA polymerase
• DNA polymerase
• regulatory genes
• structural genes
___ are responsible for the production of proteins that are involved in the structure and functioning of an organism. Conversely, ___ are responsible for producing regulatory proteins such as ___ which control the expression of other genes. These proteins bind to the ___ region of operons, preventing ___ from transcribing the genes.
• promoter
• operator
Part W must be
operator
regulatory gene
structural promoter
regulatory promoter
Part Z must be
regulatory gene
regulatory promoter
structural promoter
operator
