Answer: The correct answer is D) DNA is in a nucleus in eukaryotes.
Prokaryotes are those organisms that lack a well defined nucleus and membrane bound subcellular organelles (like endoplasmic reticulum, golgi complex, mitochondria). The genetic material lies in the cytoplasm of the cell in these organisms.
Example - Bacteria like E.coli.
On the other hand, eukaryotes are those organisms that contain a well defined nucleus that possesses the genetic material (DNA). These organisms also contain membrane bound subcellular organelles.
Example - Plants and animals.
Doctors try to remove tumors from the body to prevent it from spreading and affecting other parts of the body.
Answer:
Cytoskeleton is the lattice-like structure of microtubules that support the cytoplasm and anchors organelles and also function in cytoplasmic streaming during cell crawling.
Explanation:
A group or network of protein fibers found within the cytoplasm is known as the cytoskeleton. It provides structural support for cells and is responsible for cell movement, cell stability, cell reproduction, cytoplasmic streaming or transportation of substances, etc. The movement of the cytoplasm within a plant or animal cell which helps to transport nutrients, proteins, and organelles within the cells is known as cytoplasmic streaming or protoplasmic streaming. The main three different types of protein-based filaments found in the cytoskeleton are microtubules, intermediate filaments, and microfilaments.
They are small, thick tubes made up of a protein called tubulin. They help to maintain cell shape and structure and are a part of the mitotic spindle which pulls homologous chromosomes apart during the cell division. The structures involved in cell movements such as cilia and flagella are also made up of microtubules. They help to resist the compression of the cell, provide pathways for secretory vesicles to move through the cell and also have a role in positioning the organelles within the cell.
They are thin filaments made up of a strong and flexible protein called actin. Actin filaments along with the protein myosin are responsible for cell movement and muscle contraction. Both proteins also have a role in splitting of a parent cell into daughter cells during cell division.
Their thickness is intermediate between the microfilaments (thinnest structure) and microtubules (thickest structure). They are made up of a protein called keratin and provide structure to the nuclear envelope and help anchor organelles together within a cell. Intermediate filaments along with the microtubules help to maintain cell shape and structure. They help to resist the tension of the cells and also link cells to other cells.
The answer is Universal. Here is why...
The total amount of energy and matter in the Universe<span> remains constant, merely changing from one form to another. </span>
Answer:
They can alter the phenotype of an organism
