Because natural selection can only increase or decrease frequency of alleles that already exist in the population
When neurons are loaded with fura-2, an increase in cytoplasmic fluorescence is expected when the neuron is depolarized. Fura-2 is a calcium indicator dye that is often used to measure changes in intracellular calcium concentration. When neurons are depolarized, there is an influx of calcium into the cell, which results in an increase in fluorescence.
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Explain Cytoplasmic fluorescence?</h3>
Cytoplasmic fluorescence is a type of fluorescence that occurs in the cytoplasm of cells. This fluorescence is caused by the presence of fluorescent molecules in the cytoplasm, which absorb and emit light at specific wavelengths. The most common fluorescent molecule in the cytoplasm is green fluorescent protein (GFP), which emits green light when excited by ultraviolet (UV) light. Cytoplasmic fluorescence is used in many biological applications, including cell imaging, protein localization, and gene expression analysis.
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1. Answer;
Light microscope (LM)
Explanation;
-A light microscope (LM) is an instrument that uses visible light and magnifying lenses to examine small objects not visible to the naked eye, or in finer detail than the naked eye allows.
-It allows attachment of the focus wheels and the stage to the microscope. A light source used in place of a mirror. Most microscopes do allow manual light adjustment via a wheel located near the base.
2. Answer;
Scanning electron microscope (SEM)
Explanation;
-A scanning electron microscope (SEM) scans a focused electron beam over a surface to create an image. The electrons in the beam interact with the sample, producing various signals that can be used to obtain information about the surface topography and composition.
-There are two main types of electron microscope; the transmission EM (TEM) and the scanning EM (SEM). The transmission electron microscope is used to view thin specimens (tissue sections, molecules, etc) through which electrons can pass generating a projection image.
Answer:
There are four principles at work in evolution—variation, inheritance, selection and time. These are considered the components of the evolutionary mechanism of natural selection.
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Answer:
46 chromosomes
Explanation:
There are 46 chromosomes in a typical human body cell. (23 pairs of chromosomes)
