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Marat540 [252]
3 years ago
13

Which of the following can be used to compare the amount of radioactively

Biology
1 answer:
katovenus [111]3 years ago
6 0

Answer:

D. Scintillation counter  

Explanation:

DNA is usually labelled with radioactive phosphorus, which is a β emitter, so you need a device that can detect β particles.

A scintillation counter detects β particles because they emit a flash of light when they hit a phosphor. The device converts the flashes into electrical signals, amplifies then about a million times, and then counts them.

A, B, and C are wrong. They are all common laboratory equipment, but they can't detect radioactivity of any sort.

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Which statement best describes herd immunity? To provide cows and other live stock with vaccines so diseased do not spread among
Ugo [173]

Answer:

a To provide cows and other live stock with vaccines so diseased do not spread among farmers and cattle herders.

Explanation:

because that one makes the most sense and it is true

5 0
2 years ago
The figure below shows bands of DNA that were separated using gel electrophoresis. Which band contains the smallest DNA fragment
diamong [38]
I believe the answer would be Band C.
6 0
3 years ago
Science:Imagine that only half of the water vapor that the air can hold is actually in the air.
yaroslaw [1]
I think it D.100% because the air has reached its limit
5 0
3 years ago
Imagine that you've discovered a regulatory sequence thousands of base pairs away from the promoter and that when this sequence
Tresset [83]

Answer:

An Enhancer

Explanation:

Enhancers are the regulatory sequences and are generally located 80-160 base pairs upstream of the transcription start site. Enhancers have bidirectional elements that are involved in the initiation of transcription. Enhancers serve as the binding sites for activators to increase the concentration of activators in the vicinity of the promoter and thereby increase the rate of transcription of the gene.

According to the given information, the loss of a regulatory sequence led to a reduced level of transcription of the gene. This means that the regulatory sequence was involved in the upregulation of transcription. The presence of the sequence far away from the promoter makes it an enhancer.

4 0
3 years ago
which principles states, that in undisturbed rock layers, the oldest rocks are on the bottom and the youngest rocks are on top
Leviafan [203]

Answer:

The correct answer is principle of superimposition.

Explanation:

According to the superimposition principle, in the undisturbed rocks, the youngest rocks are situated on the top and the oldest rocks are found in the bottom. The phenomenon takes place due to withering. The rocks get withered because of the influence of air and water.  

The soil particles or the sediments get gathered at another site. The deposits of sediments get concentrated with time and result in the production of rocks. The mature rocks get surrounded by the layers of sediments with time passing by. These sediments get concentrated again to produce novel rocks. Through this procedure, the fresh young rocks get produced over the older ones.  

3 0
3 years ago
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