Answer:
<h2>False</h2>
Explanation:
Natural killer cells (NK cells) are a type of lymphocyte and also a component of innate immune system. NK cells play various functions in immune system and they play a major role in the host-rejection in virally infected cells.
NK cells are activated in response to interferons and also by various other responses. NK cells work to by secreting IFNγ and TNFα. Natural killer cells play a very important role in early host defense against viruses.
Answer:
The correct answer is: Meiosis makes it possible for a zygote to have the correct number of chromosomes.
Explanation:
Meiosis is a type of cell division used by reproducing organisms to produce the gametes (as sperm or egg cells). It has two rounds of division that results in four cells with one copy of each chromosome.
Before the division, genetic material from each chromosome is crossed over and creates new combinations of code on each chromosome. During fertilization, the cells produced by meiosis will conjoin to create a cell with copies of each chromosome again, the zygote.
Answer:
False
Explanation:
Water is not a mixture of hydrogen and oxygen but its a compound composed of hydrogen and oxygen atom bound 2:1 ratio. Well the triple distill water is pure and water from your tap, river, sea is not pure in the sense at least your purified tap water will contain sodium, calcium and related ions.
Answer and Explanation:
the total length of the gene is 6,000 base pairs (or) 6.0 kb and it has five exons, four introns and a 1,000 base pair length flanking region for the transcribed region.
Hence, each exon has (1500/5) = 300 by
each intron has (3500/4) = 875 by and
flanking segment (5' and 3') length for the transcribed region would be (1000/2) = 500 bp.
The gene segment is as shown in the <em>1st diagram attached below </em>
In eukaryotes, transcription takes place in the nucleus which results in the synthesis of hnRNA (heteronuclear ribonucleic acid). This hnRNA (pre-RNA) has both introns and exons, however when it is synthesized or while it is being synthesized the Spliceosomal complex removes introns from hnRNA and becomes converted into mRNA (messenger RNA) in the nucleus itself.
(<em>second diagram explains further)</em>
Now the synthesized mRNA reaches the cytoplasm. So, if mRNA collected from the nucleus and cytoplasm will have the same length of about 2,500 base pairs only. Therefore, after the commencement of northern blot analysis both mRNA will yield the same kind of result and have unique length.
