Which statement does not correctly describe a theory?
The statement that does not correctly describe a theory is D. It is based on scientific evidence.
Which of the following statements indicate why the cell theory is a theory instead of a law?
Explanation: The cell theory can never become a law because Scientific theories are well-tested explanations, while laws are well-tested descriptions of natural phenomena; one cannot become the other. A scientific theory is subjected to be changed overtime but a law cannot change.
Which statements explain why theories change over time?
Answer: Scientists and researchers find new evidence as time passes, they find new outcomes and therefore the theories change.
Which of the following does not fit the cell theory?
The organisms which do not follow cell theory are : ¤ Bacteria : prokaryotic organisms such as bacteria do not have well defined nucleus. ¤ Viruses, prions, viroids : They are akaryotic biological agents without cellular organisation i.e no membrane, no cytoplasm, and no nucleus.
What are exceptions to the cell theory?
The first cell did not come from another cell. Mitochondria and chloroplasts have their own genetic material and can reproduce independently from the cell in which they reside.
Which organism is not a cell?
Viruses
Which organelle acts like the control center of the cell and contains DNA?
nucleus
Who controls the function of cell?
In this manner, the nucleus controls the characters and functions of cells in our body.
Why nucleus is called control Centre of the cell?
The nucleus is the largest and most prominent of a cell’s organelles (Figure 3.7). The nucleus is generally considered the control center of the cell because it stores all of the genetic instructions for manufacturing proteins.
What activities does nucleus control?
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus. The gel-like matrix in which the nuclear components are suspended is the nucleoplasm.
How nucleus controls all the activities in the cell?
The nucleus directs all cellular activities by controlling the synthesis of proteins. The nucleus contains encoded instructions for the synthesis of proteins in a helical molecule called deoxyribonucleic acid (DNA). The cell’s DNA is packaged within the nucleus in a structural form called chromatin.
Which is the longest human cell?
Neurons or nerve cells can be up to 3 feet long. A typical neuron has a cell morphology called soma, hair-like structures called dendrites and an axon. Neurons are specialized in conveying knowledge throughout the body.
What is the biggest and smallest cell in the world?
The smallest cell is Mycoplasma (PPLO-Pleuro pneumonia like organims). It is about 10 micrometer in size. The largest cells is an egg cell of ostrich. The longest cell is the nerve cell.
Why are sperm small and Eggs large?
Egg cells are considerably larger than sperm cells because they carry the cytoplasm and organelles necessary for cell division and growth to begin, while sperm cells are basically a cell nucleus and a tail. An egg cell, or ovum, is the largest cell in the human body. …
Which is larger a sperm or egg?
Egg and sperm are both gametes, or reproductive cells. Notice how different they are, however. The egg is much larger than the sperm.
Why is the sperm cell so small?
Sperm are smaller than most cells in the body; in fact, the volume of a sperm cell is 85,000 times less than that of the female gamete. The head of the sperm contains the extremely compact nucleus with very little cytoplasm. These qualities contribute to the overall small size of the sperm (the head is only 5 μm long).
Which cell is bigger the male or female Why?
The answer relates to the size of cells that will fuse together to produce the next generation (the sex cells or gametes). The individual that produces the relatively smaller gamete is universally called “male” and the individual that produces the relatively larger gamete “female”.
Do females have more genes than males?
Men and women have practically the same set of about 20,000 genes. The only physical difference in their genetic make up is in the sex chromosomes. Only males have a Y chromosome. Although the X chromosome is present in both sexes, there are two copies in females and only one in males.
Who has the strongest genes male or female?
Genes from your father are more dominant than those inherited from your mother, new research has shown.