During a muscle contraction, the muscle cell membrane becomes temporarily permeable to

Biology

1 answer:

Scorpion4ik [409]3 years ago

7 0

During a muscle contraction, the muscle cell membrane becomes temporarily permeable to

b. sodium

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

cricket20 [7]

Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.

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3 years ago

For energy, a plant breaks apart some of the small sugars it builds. What does the plant do with the rest of its small sugars?

balandron [24]

Answer:

The plant stores them as starch

Explanation:

A typical plant synthesizes sugars from photosynthesis by using water and carbon dioxide.

$6CO_2 + 6H_20 + energy --> C_6H_1_2O_6 + 6O_2$

Parts of the sugar synthesized via photosynthesis is used to generate energy during respiration. The energy generated is useful for other metabolic processes in the plant's body.

$C_6H_1_2O_6 + 6O_2 --> 6CO_2 + 6H_20 + energy$

The remaining sugar is utilized in the synthesis of starch and stored in the various tissues of the plant.

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3 years ago

A 100% B. 25% c. 50% D.75%

tekilochka [14]

Hey there what is your question?

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3 years ago

Why are there fewer organisms in each level as you go up the energy pyramid

SVETLANKA909090 [29]

Explanation: The energy pyramid describes how energy gets distributed through an ecosystem. The more there is of an organism on the energy pyramid, the more it gives overall to the ecosystem. The less there is of an organism, the less it gives to the ecosystem. Take the Floridian Everglades as an example. There is an abundance of sawgrass, and that makes up the foundation of the system, along with mangroves and such. But there are less of predators in the ecosystem because they only feed of of their prey like small mammals or fish. They never start the food chain, they end it.

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3 years ago

Which action would the nurse taken when the patient who is nothing by mouth(npo)(no food or fluids allowed) develops an adverse?

xenn [34]

When the patient who is nothing by mouth (NPO) (no food or fluids allowed) develops an adverse reaction to a new intravenous (IV) drug, then the nurse will take action like recording the reaction, stopping the further administration of the drug and notify the health care provider.

Nothing by mouth (NPO) is a period of time in which the patient is advised not to eat or drink anything. Doctors suggest avoiding eating food or drinking water during the medical or surgical procedure to ensure the correct report or successful operation of the patient.

NPO is a common practice, and it instructs that patients should not take solid and liquid before receiving general anaesthesia.

Learn more about the NPO here

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1 year ago