secondary
The answer is A. Primary
The base paring that occurs during DNA replication is Adenine to Thymine, Thymine to Adenine, Cytosine to Guanine, Guanine to Cytosine.
During DNA replication, specific base pairings occur that ensure accurate and faithful duplication of the genetic information.
DNA consists of four nucleotide bases:
adenine (A),
thymine (T),
cytosine (C), and
guanine (G).
The base pairing rules are as follows:
Adenine (A) always pairs with Thymine (T).
Thymine (T) always pairs with Adenine (A).
Cytosine (C) always pairs with Guanine (G).
Guanine (G) always pairs with Cytosine (C).
Learn more about DNA replication here: brainly.com/question/21265857
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b. transmission electron microscope
c. scanning electron microscope
d. compound light microscope
Answer:
The correct answer is option b.
Explanation:
Transmission electron microscope or TEM emits electrons that pass through the vacuum tube of the microscope. TEM has an electromagnetic lens that focuses the electrons into a very fine beam.
The transmission electron microscope can be used to seeing very thin specimens of tissue sections, molecules, and other smaller structures that can not be seen by light microscope or dissecting microscope, in which electrons can travel creating a projection image.
Thus, the correct answer is option b.
Few positive particles aimed at a gold foil seemed to bounce back is the evidence that is responsible for the development of atomic model. Rutherford performed an experiment in which alpha particles are allowed to fire on the gold foil.
Some of the particles bounced back which tell us that there are heavy particles present in the center of an atom.
Most alpha particles pass through the atom which tell us that there is a lot of empty space in an atom.
There is also a slight deflection that occur due to similar charge that tells us the element which is present in the nucleus has positive charge.
The Gold Foil Experiment conducted by Rutherford, Geiger, and Marsden led to the development of the Rutherford Atomic Model. The results of the experiment suggested that atoms contain a densely packed, positively charged nucleus in the center with electrons orbiting around it, and mostly, atoms are composed of empty space.
The key experimental evidence that led to the development of the Rutherford atomic model from the Thomson model was the Gold foil experiment. As described, physicist Ernest Rutherford, along with Geiger and Marsden, pointed a beam of alpha particles at a thin piece of gold foil. They observed that a small fraction of these alpha particles bounced back, suggesting they hit a densely packed, positively charged center in the atom. Most alpha particles passed through the gold foil indicating that atoms are mostly empty space. These observations couldn't be explained by the previous atomic model (Thomson Model) where it was assumed that positive and negative charges were uniformly distributed throughout the atom. Therefore, Rutherford proposed a new model, where the atom consists mostly of empty space, with a densely packed, positively charged nucleus in the center and negatively charged electrons orbiting around it.
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Fungus-like protists are unique organisms that, unlike typical autotrophs, extract nutrients from decaying organic matter instead of producing their own food. They contribute significantly to ecosystem maintenance through their decomposition role.
Fungus-like protists are unique organisms that cannot be classified as either autotrophs or heterotrophs in the traditional sense. While autotrophs are typically defined as organisms that produce their own food through processes like photosynthesis, these protists acquire nutrients in a way that's normally associated with heterotrophs. Rather than producing their own food, they absorb nutrients from decaying organic matter. They play a vital role in the ecosystem by helping to break down deceased organism material and waste.
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