Question: Can sense and antisense sequences exist on different parts of the same strand of DNA
About the article "DNA", section "Sense and antisense".

Candidate passages:
A DNA sequence is called "sense" if its sequence is the same as that of a messenger RNA copy that is translated into protein.
The sequence on the opposite strand is called the "antisense" sequence.
Both sense and antisense sequences can exist on different parts of the same strand of DNA (i.e.
both strands can contain both sense and antisense sequences).
In both prokaryotes and eukaryotes, antisense RNA sequences are produced, but the functions of these RNAs are not entirely clear.
One proposal is that antisense RNAs are involved in regulating gene expression through RNA-RNA base pairing.
A few DNA sequences in prokaryotes and eukaryotes, and more in plasmids and viruses, blur the distinction between sense and antisense strands by having overlapping genes.
In these cases, some DNA sequences do double duty, encoding one protein when read along one strand, and a second protein when read in the opposite direction along the other strand.
In bacteria, this overlap may be involved in the regulation of gene transcription, while in viruses, overlapping genes increase the amount of information that can be encoded within the small viral genome.
In genetics, a sense strand, or coding strand, is the segment of double-stranded DNA running from 5' to 3' that is complementary to the antisense strand of DNA, which runs from 3' to 5'.
The sense strand is the strand of DNA that has the same sequence as the mRNA, which takes the antisense strand as its template during transcription, and eventually undergoes (typically, not always) translation into a protein.
The immediate product of this transcription is a resultant initial RNA transcript, which contains sequencing of nucleotides that are identical to the sense strand.
The exception to this is that uracil is used for nucleotide sequencing of RNA molecules rather than thymine.
Most eukaryotic RNA transcripts undergo additional editing prior to being translated for protein synthesis.
This process typically involves removal of introns from the initial RNA transcript, the addition of a methylated guanine nucleotide cap at the 5' end, and the addition of a poly-A tail at the 3' end.
This deletion process is known as splicing.
The end product is known as a mature mRNA.
Prokaryotic mRNA does not undergo the same process.
Strictly speaking, only the mRNA makes "sense" with the genetic code, as the translated protein peptide sequence can be directly inferred from this strand.
The "antisense" strand of DNA is complementary to the "sense" strand and is the actual template for mRNA synthesis.
Knowing the difference between the sense and antisense strands is important in certain molecular biology applications.
For example, in microarray expression technologies, it is important to know which strand is "viewed" on the array.
An array can correspond to either strand; however, a single array will be made entirely of "sense" or "antisense" strands.
Identifying the different strands is also important in understanding small interfering RNAs, or siRNA. 
DNA strand 1: antisense strand (transcribed to)→ RNA strand (sense)DNA strand 2: sense strandSome regions within a double strand of DNA code for genes, which are usually instructions specifying the order of amino acids in a protein along with regulatory sequences, splicing sites, noncoding introns, and other complicating details.
For a cell to use this information, one strand of the DNA serves as a template for the synthesis of a complementary strand of RNA.
The template DNA strand is called the transcribed strand with antisense sequence and the mRNA transcript is said to be sense sequence (the complement of antisense).
Because the DNA is double-stranded, the strand complementary to the antisense sequence is called non-transcribed strand and has the same sense sequence as the mRNA transcript (though T bases in DNA are substituted with U bases in RNA).
"A note on the confusion between "sense" and "antisense" strands:" The strand names actually depend on which direction you are writing the sequence that contains the information for proteins (the "sense" information), not on which strand is on the top or bottom (that is arbitrary).
The only real biological information that is important for labeling strands is the location of the 5' phosphate group and the 3' hydroxyl group because these ends determine the direction of transcription and translation.
A sequence 5' CGCTAT 3' is equivalent to a sequence written 3' TATCGC 5' as long as the 5' and 3' ends are noted.
If the ends are not labeled, convention is to assume that the sequence is written in the 5' to 3' direction. 
The two complementary strands of double-stranded DNA (dsDNA) are usually differentiated as the "sense" strand and the "antisense" strand.
The DNA sense strand looks like the messenger RNA (mRNA) and can be used to read the expected protein code by human eyes (e.g.
ATG codon = Methionine amino acid).
However, the DNA sense strand itself is not used to make protein by the cell.
It is the DNA antisense strand which serves as the source for the protein code, because, with bases complementary to the DNA sense strand, it is used as a template for the mRNA.
Since transcription results in an RNA product complementary to the DNA template strand, the mRNA is complementary to the DNA antisense strand.
The mRNA is what is used for translation (protein synthesis).
Hence, a base triplet 3'-TAC-5' in the DNA antisense strand can be used as a template which will result in an 5'-AUG-3' base triplet in mRNA (AUG is the codon for Methionine, the start codon).
The DNA sense strand will have the triplet ATG which looks just like AUG but "will not be used to make Methionine" because it "will not be used to make mRNA".
The DNA sense strand is called a "sense" strand not because it will be used to make protein (it won't be), but because it has a sequence that looks like the protein codon sequence.
Students may find this confusing if they misunderstand the meaning of "sense" and if they misunderstand complementation.
To make things more confusing, before the convention was set, very early textbooks disagreed on the DNA strands called "sense" and "antisense.
"In biology and research, short antisense molecules can interact with complementary strands of nucleic acids, modifying expression of genes.
See the section on "antisense oligonucleotides" below. 
Wherever a gene exists on a DNA molecule, one strand is the coding strand (or sense strand or non-template strand), and the other is the noncoding strand (also called the antisense strand is a general term for a sequence of DNA or RNA that is complementary to mRNA, anticoding strand, template strand, or transcribed strand).