Which is a closed system.a tree, a human ,a clock , or a car

1 answer:

4 0

A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)

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Which factor in this swamp is abiotic? A. Grass B. Trees C. Algae D. Water

Lelechka [254]

Answer:

D. Water

Explanation:

Biotic factors are all living things, and they are derived from organisms. These include: fungi, plants, bacteria, archaea, protists, animals.

Abiotic factors are all nonliving things, and they are not derived from organisms. These include: air, soil, light, water, minerals.

In this case, grass, trees, and algae are all living things since they are derived from organisms.

On the other hand, water is not a living thing since it is not derived from organisms.

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What role does the MutL protein play in DNA repair? (5 POINTS) It performs a proofreading function, similar to DNA polymerase, a

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It recognizes and binds to a pair of "mismatched" nucleotides, preventing their translation.

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Mut L protein is involved in mismatch DNA repair. MutL protein is complexed with MutS protein and the MutL-MutS complex recognizes all the mismatched base pairs present in the newly formed DNA strand. The complex can not recognize the "C-C" pairs. MutH protein joins the complex.

The MutH protein also has a site-specific endonuclease activity and cleaves the unmethylated DNA strand towards the 5' end of the guanine base in the GATC sequence to mark the strand for DNA repair. In this way, MutL protein, along with MutS and MutH proteins mark the mismatched DNA bases for repair so that they are not translated into a faulty protein.

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In the process of translation, the statement stands correct and applies are as follows:

The ribosome has two sub-units that work together.
Amino acids are joined by peptide bonds.
Each tRNA brings in exactly one amino acid that corresponds to the anti-codon.
The order of the amino acids is determined by the mRNA which is transcribed from DNA.

Answer: Options A, B, C, and E

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In the process of translation, ribosomes are the structural unit where the translation is being performed and it has the two sub-units which enact together the translational process.

Any two amino acids are bonded together by peptide bond and tRNA brings one amino acid at a time which corresponds to the anti codon. The order of amino acids is determined by mRNA transcribed from the DNA, and not from the ribosome. Thereby, all given options are correct except the option D.

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