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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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Pick all the characteristics below that describe compounds
taurus [48]

Compounds are made up of two or more elements which are chemically bonded. The elements and the properties of the compound are different. Exposure to light and chemical reaction can break compounds into elements. Compounds are only chemically separated not physically. The mass of elements determined the mass of the compound.

6 0
4 years ago
Which of the following statements about NAD+ is true?
irga5000 [103]

Answer:

NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.

Explanation:

8 0
3 years ago
An internal membrane system where lipid components of the cell membrane are assembled, along with proteins and other materials
MakcuM [25]
A. Lipid bilayer: the phospholipid bilayer is the membrane of a cell. The bilayer contains lipids, membrane proteins, cholesterol, receptors for various molecules, pumps to transport ions and solutes against the concentration gradient, and many other items necessary for a cell to function and work together with other cells.

b. Osmotic pressure: Osmosis is the flow of water across a semipermeable barrier from an area of low solute concentration to high solute concentration. Osmotic pressure is the lowest possible pressure to prevent this water movement.

c. Endoplasmic Reticulum: the Rough ER synthesizes proteins for use outside the cell. The Smooth ER produces lipids and some steroidal hormones.

A. Lipid Bilayer is therefore the correct answer. Osmotic pressure does not involve the various components of the cell membrane, and the ER's produce proteins and hormones. Therefore A is right.

Hope this helps! :) Let me know if you need a clarification.
3 0
4 years ago
Which of these changes take place during labor?
Volgvan

Answer:

The answer is rhythmic contraction of the uterus wall.

Explanation:

this is because when muscle is overly used, it brings about contraction

5 0
3 years ago
The DNA sequences below show DNA segments for four different species. DNA SEQUENCES Species A TGG CAA CGG CAG ATT TAG Species B
ArbitrLikvidat [17]

Answer: I think it's A: the DNA of all organisms contains the same four bases.

4 0
3 years ago
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