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Vikki [24]
3 years ago
5

Although restriction enzymes are quite efficient at digestion of foreign DNA, they are prevented from acting on the DNA of host

cells by: The inability of host cell DNA to be bound to the active site of the enzyme. The presence of competitive inhibitors which prevent the enzymes from binding to the host DNA. The methylation of bases in recognition sequences in host cell DNA. The inaccessibility of host cell DNA for the enzymes.
Biology
1 answer:
kirill115 [55]3 years ago
8 0

Answer:

Restriction enzymes are quite efficient at digestion of foreign DNA, they are prevented from acting on the DNA of host cells by the methylation of bases in recognition sequences in host cell DNA - Option C.

Explanation:

A bacterial cell that produces a restriction enzyme does not have its own DNA, although , due to restriction modification system, it contains diverse restriction sites for the recognition enzyme.

The modification system includes the modification enzyme - DNA methylase, which recognizes the modification site and modifies the site by the addition of a methyl group to one or two bases.

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What effect have at-home dna tests had on law enforcement? readworks.
Vlada [557]

DNA profiles from a crime scene can be entered into CODIS. Therefore, law enforcement officers have the ability to identify possible suspects when no prior suspect existed. This is the best i can do, I dont know about exactly "at home" tests.

3 0
2 years ago
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Correctly identify each of these definitions or examples as either depolarization or hyperpolarization of the plasma membrane. 1
natulia [17]

Answer:

  1. hyperpolarization
  2. depolarization
  3. hyperpolarization
  4. depolarization
  5. hyperpolarization
  6. depolarization
  7. depolarization

Explanation:

The resting membrane potential is balanced by ion leakage and ion pumping, to get an electrical signal started the membrane potential has to lose its balance. This starts with a membrane channel opening for Na+ since Na+ concentration is higher outside the cell, ions will rush into the cell. This will change the relative voltage inside the cell. The resting potential has a voltage of -70 mV, the sodium cation entering the cell cause it to become less negative. <em>This is known as depolarization.</em>

The concentration gradient for Na+ will continue to enter the cell making the voltage to become positive reaching +30 mV. At the same time, this happens, other voltage-gated channels are also opening, a concentration gradient acts on K+, as well, as it leaves the cell, it takes a positive charge with it making the membrane potential to move back to its resting voltage of -70 mV. <em>This is called repolarization. </em>

For potassium ions to reach equilibrium the membrane voltage needs to be below -70 mV, this leads to a period of <em>hyperpolarization</em> that occurs while the K+ channels are open.

I annexed an image that illustrates this action potential process.

<em>Considering the information given during depolarization there's an increase in the number of sodium leak channels (7) making the inside of the cell more positive (2) increase in the membrane potential (4), this also implies a decrease in the extracellular concentration of potassium (6)</em>

<em>Meanwhile, during hyperpolarization an increase in the extracellular concentration of potassium (3) decreases the membrane potential (1) making the inside of the cell more negative (5).</em>

I hope you find this information useful and interesting! Good luck!<em>       </em>

4 0
3 years ago
Which statement accurately describes recent population density and shifts in Southeast Asia?
Shkiper50 [21]

Answer:

Indonesia's capital of Jakarta has become a megalopolis.

Explanation:

I took the test

7 0
3 years ago
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The chloroplasts of flowering land plants typically contain at least two photosynthetic pigments
SashulF [63]

Answer:

Chlorophyll A, and B.

Explanation:

Chlorophyll is known as the green pigment which is present in plants. Through the process of photosynthesis, It helps to convert solar light into useful energy. They have light absorption properties, so they are known as photoreceptors. Mainly two types of Chlorophyll are present in plants:

Chlorophyll A: It Is known as the primary photosynthetic pigment and has the ability to absorbs red, blue, and violet lights. Chlorophyll A is the location of the photochemical processes and can absorb light which is needed for the process of photosynthesis.

Chlorophyll B: It mainly helps to absorb blue light which is utilized to fill out the absorption of chlorophyll A it means it helps to supply additional light energy to chlorophyll A. It is known as the accessory pigment.

5 0
3 years ago
Osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively per
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The difference in water concentration across a selectively permeable membrane.

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3 years ago
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