Answer: Electron Microscope is most appriopriate for studying living cells.
Explanation:
Most of the cells are so tiny that they cannot be viewed with the naked eye. Therefore, scientists must use microscopes to study the behavior of cells. Electron microscopes provide higher magnification, higher resolution, and more detail than light microscopes.
The major demerits are size, maintenance, cost, researcher training and image artifacts resulting from specimen preparation. This type of microscope is a large, cumbersome, expensive piece of equipment, strongly sensitive to vibration and external magnetic fields.
Answer:
This question lacks options, the options are:
A) Saliva converting the starch molecules in crackers into simple sugars
B) Digestive enzymes breaking down proteins into smaller fragments
C) bacteria converting lactose into simple sugars in the intestines
D) teeth grinding an almond into smaller pieces in the mouth
The answer is D
Explanation:
A physical change is a change that occurs to a substance without altering its chemical composition. A physical change involved a change in the substance's shape, texture, color, state etc. but not the chemical content of such substances.
In this question involving the processes that occur in digestion, a typical example of physical change is "teeth grinding an almond into smaller pieces in the mouth" because the teeth only changes the shape and texture of the almond. It does not affect the chemical composition of the almond fruit. This is also called mechanical digestion.
Note that, other options involving digestive enzymes breakdown are chemical changes because the enzymes breakdown the chemical components of each substance.
<u>Lose their function</u>.
Prions are infectious particles that can cause normal proteins to assume a misfolded shape. when the proteins assume an abnormal three- dimensional shape, they <u>lose their function.</u>
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<h3>What causes misfolding in prions?</h3>
- Transmissible spongiform encephalopathies are linked to the human prion protein's (PrP) abnormal folding and aggregation (TSEs).
- The transformation of PrP from its cellular form into its pathological scrapie conformation produces intermediate conformations, which are a significant factor in the misfolding process.
<h3>Protein shapes are they altered by prions?</h3>
- Normal PrPC proteins can be transformed into the infectious isoform by the infectious isoform of PrP, also known as PrPSc or simply the prion, by changing their conformation, or shape, which then changes how the proteins attach to one another.
<h3>How can misfolded proteins called prions spread disease?</h3>
- The self-replicating isoform of the endogenous prion protein, PRP(c), which binds to the cellular PRP and transforms it into the infectious self-replicating form, is thought to be the mechanism that creates prions.
To learn more about prions visit:
brainly.com/question/13574637
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Genetic variation is a measure of the genetic differences that exist within a population. Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation.
