Answer:
True.
Explanation:
Yes, the lens of the eye will be more spherical when the ciliary muscles are contracted due to tension. When the relaxation occurs in the ciliary muscle , the zonular tension is increased, that causes the lens to be flatten and leads to decrease in optical power while on the other hand, when the ciliary muscle contracts, the tension in the equatorial zonular is increased which causes the central lens surface to become more rounded that leads to increases central optical power.
Role of Rosalind Franklin
Rosalind Franklin used X-ray diffractometry techniques to determine carbon structures, including graphite. Then she devotes herself to the structure of DNA. Thanks to X-ray diffractometry, which she applies to DNA, Rosalind Franklin manages to determine its structure by distinguishing, thanks to its photos, the two propellers, named A and B.
Rosalind Franklin was a victim of the Matilda Effect:
The Matilda Effect is the phenomenon that women scientists do not benefit much from the fallout of their discoveries when they do not see the Nobel simply escape them. Among them, Rosalind Franklin, the discoverer of DNA.
The photo taken by Rosalind Franklin, at the origin of his deductions, became essential for the research conducted by James Dewey Watson and Francis Crick on the helical structure of DNA.
James Watson and Francis Crick publish their model in Nature in April 1953, thanking Wilkins and Franklin.
Answer:
Which statement best describes a scientific question?
- It must be based on a hypothesis.
- It must be testable
These are the correct Answers!
Explanation:
- A good scientific question has certain characteristics. It should have some answers should be testable it can be tested by another individual through an experiment or measurement.
Therefore, I hope this helps!
The cell cycle is divided into two main stages: the interphase or nondividing stage and the mitotic or dividing stage. In interphase is the stage where a cell prepares itself by replicating its own genetic information and all of its organelles. The cell goes through this period of growth before it undergoes mitosis. The following are its three important phases. Gap 1 (G1) phase in the first gap, the cell increases in size preparation for division. During this stage, the cell prepares itself for DNA synthesis. Synthesis (S) phase DNA synthesis (replication) occurs. Chromosomes are also replicated which later on will become sister chromatids. Gap 2 (G2) phase this is the second gap. The cell continues to grow and synthesize RNA and proteins. There is also a G2 checkpoint to see if the cell is already prepared for mitosis. Some cells undergo the cell cycle only once, or they stop dividing. These cells will go to the Gap 0 (G0) phase, the resting phase of the cell. Nerve and blood cells remain in G0 phase for the rest of their lives. Thus, nerve cells and blood cells do not undergo mitosis. In mitosis once the cell is ready for cell division it will go to the next stage- mitosis. Mitosis is the process of nuclear division of a cell. Prophase is the of mitosis that takes up around 50-60 percent of total time for mitosis. It is subdivided into three substages: early, middle, and late prophase. In early prophase, chromosomes condense and start to coil up into short rods, the nuclear membrane disappers, and the centrioles appear and move toward the opposite sides (the poles) of the nuclues. In the middle prophase, mitotic spindle fibers are formed between the centrioles.Asters also formed on each side of the nucleus. The centrioles move towrdsthe poles. The nuclear membrane dissolves. In late prophase, chromosomes are attached to the centrioles through the spindle fibers. In metaphase, the centrioles have completed their migration toward the poles. The double-stranded chromosomes are aligned at the cells's midplane (equator). The centromeres of each chromosome are attached to the fully formed spindle fibers. In anaphase, the centromeres, followed by the chromatids, are separated when the spindle fibers shorten and pull the chromatids toward the end of the poles. The chromatids are now called chromosomes. Telophase is the last stage of mitosis which is usually referred to as the "reveres prophase" stage.In this stage, the spindle fibers disappear, the nuclear membrane and nucleoli reappear, and the chromosomes uncoil. Cytokinesis, follows mitosis. In animal cells, a cleavage furrow is formed until the membrane separates, forming two daughter cells. In plant cells, a cell plate is created that eventually develops into a cell wall.
Yes, it is very true, if you don't know these symbols, you're basically lost.
