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2 years ago

NOW!!!!!!!!!!!!

Biology

1 answer:

Nataliya [291]2 years ago

7 0

i dont know if i did it right but

1. OPEN SYSTEMS

Your body is an example of an open system. This is because open systems exchange both matter and energy with an outside system.

2. CLOSED SYSTEMS

An example of a closed system is the earth, because it obtains lots of energy from the Sun but the exchange of matter with the outside is almost zero. In a closed system, energy but not matter is exchanged with an outside system

3. ISOLATED SYSTEMS

An example is a closed thermos bottle. This system do not communicate with the outside in any way. Isolated systems can exchange neither energy nor matter with an outside system.

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Long before the structure of DNA was solved, the physicist Erwin Schrodinger suggested that the three-dimensional arrangement in

Georgia [21]

Watson and Crick's model explained mutability because bases pairs can suffer changes (mutations) during DNA replication. Moreover, this model also explained stability because DNA strands are held together by hydrogen bonds.

Deoxyribonucleic acid (DNA) is a double helix molecule composed of two long chains of four types of nucleotides, each containing one different nitrogenous base, i.e., Adenine, Guanine, Cytosine and Thymine.

In Watson and Crick's model, both DNA strands are held together by hydrogen bonds between nitrogenous bases on opposite DNA strands, thereby providing stability to the DNA molecule.

In DNA, Guanine always pairs with Cytosine by three hydrogen bonds, while Adenine always pairs with Thymine by two hydrogen bonds.

Moreover, Watson and Crick suggested that mutations could occur as a consequence of a base occurring very infrequently in one of the less likely tautomeric forms during DNA replication, thereby also explaining the mutability of life.

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2 years ago

Which of the following statements is NOT true about the

joja [24]

Answer:

A) Between nucleotides, the base A will bind to the base G, and the base T will bine to the base C.

Explanation:

bases A and T bind to together, while bases G and C bind together.

(according to studies)

This is why A is the correct answer.

Hope it helps!!(Also, please don't forget to add me as brainiest to support me)

6 0

2 years ago

As cells increase in size, surface area to volume ratio –

andreyandreev [35.5K]

Explanation:

increases

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3 years ago

Pyramids depicting the number of organisms or biomass may be inverted, upright, or even diamond-shaped.

Delicious77 [7]

Answer:

The correct answer is - as energy lost at every trophic level.

Explanation:

In any ecological ecosystem the energy pyramids always upright unlike other pyramids such as biomass showing the number of organisms, that can be diamond shape, inverted or upright.

The main reason behind this is due to the fact that it is only a pyramid in the ecosystem that always unidirectional in the food chain which is always some energy lost with an increase in the trophic level in the food chain. This loss of energy always gets back to the atmosphere in each step of the food chain.

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3 years ago

Chromosomes are in pairs, what else comes in pairs

Leviafan [203]

Answer:

Humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome to each pair so that offspring get half of their chromosomes from their mother and half from their father.

Explanation:

(Sorry, I'm not sure)

4 0

3 years ago