Answer:
True
Explanation:
The observed cell is a plant cell because of presence of cellulose coating on cell membrane. The plasmodesmata are the a layer between cell and cell membrane of plant cells that is porous in nature and enables communication between cell and outside environment. It is obvious to find this with cellulose coating. These plasmodesmatas have same function as gap junction animal cells.
Prokaryotes reproduce by *BINARY FISSION* which creates *2*exact daughter cell clone(s) of the original parent cell.
Answer
Lower Mantle-under high pressure and nearly solid.
Lithosphere-contains the crust
Core-creates the Earth’s magnetic field
Asthenosphere-most deformable layer.
Explanation
The mantle is located below the crust and it occupies the largest volume of the Earth’s volume. The mantle behaves like a plastic and at high pressures and temperatures the rocks in the mantle deform
The lithosphere is the outer shell that contains the crust and upper mantle. The lithosphere is divided into the oceanic layer and the continental layer. It is bounded by the atmosphere and the Asthenosphere.
Answer:
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain.
Explanation:
Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.
Answer and Explanation:
An epigenetic change is defined as a change in genome that occur without modification of the primary DNA sequence. The most common epigenetic changes are DNA methylation and histone modifications.
DNA methylation involves the addition of methyl groups (-CH₃) to regions in DNA with a high frequency of Cytosine and Guanine bases (often called CpG island). In general, genes related to regulation of cell cycle and mantainance of chromosone stability and transcription regulation are not methylated. Methylation in these regions can lead to gene knowout which are related to apopthosis, regulation of cell cycle and in consequence, it can lead to tumor formation and progression.
Other epigenetic modification is histone modification though methylation or acetilation. As DNA packing in chromosomes is assisted by histone proteins, the modification of histones can lead to changes in chromatin structure. The packing or unpacking of DNA regulates the gene expresion. The alteration in the normal packing DNA could produce silencing of gene related to transcriptional regulation processes which in last instance can cause cancer.