Some flatworms can regrown body parts when injured. In the lab, you can sever the tail or head off of such a flatworm and it will regenerate completely. The cells involved in this regeneration are rapidly dividing, and thus, must likely have high expression (levels) of: a.) telomerase b.)helicase c.) ribosomes d.) topoisomerase I had thought the correct answer was helicase, since it pulls apart strands of DNA, which is useful for rapid replication, but this was the wrong answer. Please help/explain! Thanks!
Molecular Techniques
Molecular techniques are methods employed in molecular biology, genetics, biochemistry, and biophysics to manipulate and analyze nucleic acids (deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)), protein, and lipids. Techniques in molecular biology are employed to investigate the molecular basis for biological activity. These techniques are used to analyze cellular properties, structures, and chemical reactions, with a focus on how certain molecules regulate cellular reactions and growth.
DNA Fingerprinting and Gel Electrophoresis
The genetic makeup of living organisms is shown by a technique known as DNA fingerprinting. The difference is the satellite region of DNA is shown by this process. Alex Jeffreys has invented the process of DNA fingerprinting in 1985. Any biological samples such as blood, hair, saliva, semen can be used for DNA fingerprinting. DNA fingerprinting is also known as DNA profiling or molecular fingerprinting.
Molecular Markers
A known DNA sequence or gene sequence is present on a chromosome, and it is associated with a specific trait or character. It is mainly used as a genetic marker of the molecular marker. The first genetic map was done in a fruit fly, using genes as the first marker. In two categories, molecular markers are classified, classical marker and a DNA marker. A molecular marker is also known as a genetic marker.
DNA Sequencing
The most important feature of DNA (deoxyribonucleic acid) molecules are nucleotide sequences and the identification of genes and their activities. This the reason why scientists have been working to determine the sequences of pieces of DNA covered under the genomic field. The primary objective of the Human Genome Project was to determine the nucleotide sequence of the entire human nuclear genome. DNA sequencing selectively eliminates the introns leading to only exome sequencing that allows proteins coding.
Some
a.) telomerase
b.)helicase
c.) ribosomes
d.) topoisomerase
I had thought the correct answer was helicase, since it pulls apart strands of DNA, which is useful for rapid replication, but this was the wrong answer. Please help/explain! Thanks!
The ability of an organism to regenerate amputated body parts is known as regeneration. There are two types of regenerations – reparative and restorative. The ability to repair or regenerate only the damaged part of the body is termed as reparative regeneration. The regeneration of the whole body from a body segment is called restorative regeneration.
Telomeres are the repetitive nucleotide sequences present at the terminal end of chromosomes. Telomeres, along with proteins (TRF1 and TRF2), cap the chromosome end and prevent DNA loss during replication. In most sexually reproducing eukaryotes, the telomeres are maintained in the germline and early embryogenesis. The telomere elongation is achieved only through sexual reproduction, and they are shortened gradually during cellular aging.
The telomerase enzymes catalyze the addition of telomere repeat sequences at the 3' end of telomeres. They are highly active in rapidly dividing cells and cancer cells. Asexually reproducing organisms like planaria (flatworm) have highly active telomerase enzymes, and the telomere length is maintained during fission or regeneration.
Therefore, option (a) is correct
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