BIOLOGY HIGH SCHOOL

How can the amino acid sequence determine the characteristics of an organism?​

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Answer 1
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Final answer:

Organism characteristics are influenced by the amino acid sequences of proteins coded by their DNA. Amino acids vary in chemistry and structure thereby causing variation in protein structure and function. Similarities in sequences can infer close evolutionary relationships.

Explanation:

The characteristics of an organism are fundamentally determined by the amino acid sequences of its proteins. Protein sequences, composed of the 20 common amino acids, are coded by the DNA molecule in the cell. Therefore, the sequence of a DNA molecule plays a significant role in understanding an organism's identity and function.

Different amino acids have different chemistries and structural constraints, thus causing enormous variation in protein structure and function. This variety is responsible for the diversity and complexity of life. For instance, the human cytochrome c protein contains 104 amino acids, but when compared to the same protein in different organisms, only 37 of these amino acids appear in the same position. This suggests these organisms are descended from a common ancestor.

Moreover, the 3-dimensional structure of proteins, determined by the amino acid sequence, contains significant information about evolutionary relationships. These relationships can be inferred from variations over time of the nucleotide sequence of a gene. The more similar these sequences are in two organisms, the more closely related they are.

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Which phase lasts longest during an action potential in a ventricular contractile fiber?

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The phase during mitosis in which chromosomes move into the center of the cell is _____.

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Answer:

Metaphase

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Metaphase is the phase of mitosis that starts with complete disintegration of nuclear envelop. It is marked by attachment of spindle fibers to the kinetochores of chromosomes and movement of chromosomes to the middle of the cell, that is, equator. Chromosomes are aligned along center of the cell through spindle fibres .

The phase is metaphase. I can remember this because bith "meta" and "middle" start with the letter "m".

True or False: An organisms that reproduce through binary fission produce more diversity (variety ) in their offspring.

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No , an organism produced by meiosis causes more diversity due to crossing over

Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?James Watson and Francis Crick
Erwin Chargaff
Rosalind Franklin
Friedrich Miescher

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DNA stands for deoxyribonucleicacid. It has a double strand that contains the genes (a hereditary material) ofthe organism. It was discovered by James Watson and Francis Crick. Their double-helixstructure was based on x-ray diffraction image named as Photograph 51 or Photo51. It was taken by Raymond Gosling, a pHD student under the supervision ofRosalind Franklin. They used this photo to determine the chemical and physicalstructure of the DNA and the bond that links the genes altogether. The answer is Rosalind Franklin

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C. Rosland Franklin

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What is the function of the conjugation pilus?

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It is involved in the process of conjugation-exchange of genetic material between two bacteria

Explanation:

Conjugation is one of the ways by which bacteria exchange their genetic material (horizontal gene transfer). Two bacterial cells must physically connect in order to perform the conjugation. The linking occurs through a pilus.

Pilus is an appendage on the surface of bacteria cell and it is also called fimbria. Pilus is  filamentous, tubular and composed of oligomeric proteins-pilin.

Donor cell contain pilus that will attach to the recipient bacterial cell and induce the transfer.

Are these correct???

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Yeah! Those are correct!

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i think they are correct. i dont know about the fish tho

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