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3 years ago

Which statement is correct regarding the semiconservative nature of DNA?

Biology

1 answer:

galina1969 [7]3 years ago

5 0

Answer:

B. Nitrogenous bases in each "parent" strand serve as a template for the new strand to be made

Explanation:

DNA replication is the process whereby the contents of DNA is doubled or duplicated. In other words, another copy of DNA is produced from one DNA molecule. The process follows the semi-conservative model, which generally speaks of how one template strand is used to synthesize another new strand.

In the semi-conservative model of DNA replication, the double strand of DNA is unwind and one of the strands called parent strand is used synthesize a complementary strand of DNA. At the end of the process, two DNA molecules results with each having one old strand and one new strand. Nitrogenous bases or nucleotides in each "parent" strand" serve as a template for the new strand to be made.

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Define health.......................................................................

34kurt

Answer:

i didn't even copy

Explanation:

5 0

4 years ago

The structure that separates the cochlear duct from the tympanic duct is the

denis23 [38]

Answer:

the basilar membrane

Explanation:

The tympanic duct or scala tympani is one of the perilymph-filled cavities in the inner ear of humans. It is separated from the cochlear duct by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as vestibular duct.

3 0

2 years ago

Select all that apply... A. Are very willing to give up a proton B. are very willing to accept a proton C. Want to become more p

tigry1 [53]

Answer:

c and a

Explanation: i used a text book

3 0

3 years ago

Read 2 more answers

As a result of worldwide human population growth, many countries are exploring the use of alternative energy sources. One

kaheart [24]

Answer:

A. Nuclear reactors increase thermal pollution

Explanation:

From the analogy provided in this context, we can vividly see that the author is suggesting that the use of nuclear energy causes thermal pollution.

Nuclear energy is an alternate energy source as identified in the text.
Since a huge amount of heat energy is generated and they are not all used up, they are released into the ecosystem.
The earth is usually depicted as heat reservoir.
Increased release of heat to the environment will cause thermal pollution.
This increases the ambient temperature of water and degrades it.

4 0

3 years ago

Correctly identify each of these definitions or examples as either depolarization or hyperpolarization of the plasma membrane. 1

natulia [17]

Answer:

hyperpolarization
depolarization
hyperpolarization
depolarization
hyperpolarization
depolarization
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. This is known as depolarization.

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. This is called repolarization.

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

I annexed an image that illustrates this action potential process.

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)

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).

I hope you find this information useful and interesting! Good luck!

4 0

3 years ago