Lamarck<span> is best known for his </span>Theory<span> of Inheritance of Acquired Characteristics, first presented in 1801 . If an organism changes during life in order to adapt to its environment, those changes are passed on to its offspring.</span>
Answer:
Water is sticky and clumps together into drops because of its cohesive properties, but chemistry and electricity are involved at a more detailed level to make this possible. More precisely, the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to each other.
Explanation:
2. cell wall is around plant cells, regulates transport in and out of cell.
3.a plant cell does not have lysosomes whereas an animal cell does
Answer:
Option 1: Eukaryotic DNA can be highly packaged in condensed chromatin and inaccessible to transcription factors and RNA polymerase.
Explanation:
A process in which chromatin is rearranged in such a way that it comes in a state ready to began the transcription is known as Chromatin remodeling.
Basically, what happens during chromatin remodeling is chromatin changes from a condensed state into a suitable state to begin transcription, in which DNA binding proteins and transcription factors have access to bind to the DNA and start the process of transcription or gene expression smoothly.
Significance of chromatin remodeling:
- The process of chromatin remodeling holds immense importance in the expression of genes because if this remodeling will not occur, the most important gene expression controlling factors would not be able to access DNA and start transcription. Therefore, chromatin remodeling must has to be the first step in gene activation.
- When chromatin is tightly packed,it is referred to as heterochromatin. But when chromatin becomes loose and accessible for transcription it is referred to as euchromatin (please see attached figure for a better understanding).
- Once heterochromatin is changed into euchromatin, the process of transcription begins and makes it possible for the expression of genes in a timely and coordinated fashion.
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Answer No 1:
During the interphase, the genetic material is copied so that each daughter cell can receive equal and right amount of genetic material. The right amount of the genetic material is a crucial step for every daughter cell to survive.
Answer No 2:
Embryonic stem cells have the ability to convert into any type of cell type. Specialized cell types can make specialized cells. Scientists are working on producing stem cells which can cure various diseases like paralysis or brain damaged cell.
Answer No 3:
By the process of meiosis, the number of chromosomes is reduced to half in the sex cells. When an egg cells and the sperm cell unite in the process of fertilization, the number of chromosomes become diploid again. Hence, the number of chromosomes gets maintained in the embryo in this way.