Vascular plants appered during the same perod as mammals
Explanation:
Formamide molecules are added to an electrophoresis buffer for the purpose of denaturing DNA.
<h3>What is the purpose of the buffer during electrophoresis?</h3>
A laboratory procedure called electrophoresis is used to divide DNA, RNA, or protein molecules according to their size and electrical charge. The molecules are moved by an electric current through a gel or other matrix. In the case of Denaturing Gradient Gel Electrophoresis (DGGE), the gradient can be an electrical field or a denaturant such as a solution of urea and formamide.
Size, charge, and other characteristics are used in electrophoresis to separate macromolecules like protein and nucleic acids. Scientists utilize buffer to transport the charge through the gel for electrophoresis that separates by charge. Additionally, the buffer keeps the gel's pH steady, reducing alterations that would take place in the protein or nucleic acid if the pH were to become unstable.
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Answer:
The universe would be contracting which would not fit the big bang theory.
Explanation:
The universe has been expanding since the big bang. If there is new evidence found that reverses the doppler effect and that the objects in space are actually going in the opposite direction, that means that the universe is actually not expanding but contracting instead.
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Answer:
There is an accumulation of genetic mutations in the DNA of sperms due to its constant mitosis.
Explanation:
The germinative cells that will become sperms are under constant mitosis. During this process, DNA mutations can happen and be transmitted from one generation of cells to the other as the years go by, and more cell divisions take place, more mutations the DNA in the sperm will have. When the number of mutations reaches a certain level, his child will express these mutations and have autism.
The egg of the mother is not a factor because the germinative cells in women are not under constant mitosis, so there is not an accumulation of gene mutations. Women are born with an exact number of eggs for all their life.
The correct answer is C. Microevolution describes the evolution of organisms in populations, while macroevolution describes the evolution of species over long periods of time.
Explanation:
In biology, the evolution refers to changes organisms and species go through over time which is usually prompted by changes in the environment and adaptative processes. Additionally, evolution can be studied from two main perspectives: microevolution and macroevolution. Microevolution focuses on studying the changes at a lower lever usually by studying individual organisms or population, but not all organisms of a species. On the other hand, macroevolution studies the evolution or changes in species or even a group of species. For example in a microevolution biologist might study birds evolution by analyzing individuals or a specific population, while from macroevolution all the species need to be studied.
