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3 years ago

DNA fingerprinting bands are also referred to as

Biology

2 answers:

Amiraneli [1.4K]3 years ago

4 0

Answer:

The correct answer would be option C.

Explanation:

Restriction Fragment Length Polymorphism or RFLP is a method of genetic investigation on the molecular level that permits individuals to be recognized based on distinctive patterns of restriction enzyme cleave in specific points of DNA.

The basic technique for the identification of RFLPs involves segmenting a sample of DNA with the help of a restriction enzyme. Restriction enzymes can selectively restrict a DNA molecule wherever specific, short sequence is recognized.

Hence, RFLPs are referred to as DNA fingerprinting bands.

Leni [432]3 years ago

3 0

I am no expert but I think the correct answer is C.

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(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps deter

Viefleur [7K]

Active transport occurs against the electrochemical gradient. It needs energy to move molecules from the lower concentration side to the higher concentration side. The mode of transport is active transport. 

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There are three main different types of transport across the membrane

Simple diffusion ⇒ Does not need energy to occur
Facilitated transport ⇒ Does not need energy to occur
Active transport ⇒ Needs energy to occur

Active transport is the transport of molecules that move against the electrochemical gradient, so it does need energy to happen.

Molecules move from the lower concentration side to the higher concentration side of the membrane.

Carrier proteins are in charge of active transport. The needed energy might proceed from the ATP molecules or the membrane's electric potential.

In the exposed example, a scientist wants to determine how substance L enters a cells in a culture.

The cells maintain a 120 mM intracellular concentration of substance L.

Varying external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).

Table 1. Rate of entry of substance L into mammalian cells in culture

External concentration of substance(mM) Rate of entry of substance L

10 5%

20 25%

30 45%

40 65%

50 80%

60 90%

70 95%

80 100%

90 100%

100 100%

Now, we need to identify the most likely mode of transport across the membrane for substance L, and explain how information provided helps determine the most likely mode of transport.

We know that the intracellular concentration is 120mM.

As we can see, this concentration exceeds all of the culture media concentrations. Yet, the substance keep moving into the cell.

As the concentration inside the cell is always higher than the concentration outside, we can assume that this is not passive transport because the molecule transport is going against its concentration gradient.

Hence, the remaining option is active transport. And as said before, we can see it because the substance keeps crossing the membrane toward the cell interior despite its concentration being higher in the interior of the cell than in the exterior.

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Some bacteria can switch from respiration to fermentation when oxygen levels decrease.

Levart [38]

I think this is True.

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Answer:

Elements are made up of only one type of atom.

Each element has a unique chemical symbol.

Elements can be identified by their atomic number.

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Answer:

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