Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective

Sanders - Genetic Analysis: An Integrated Approach 3rd Edition

Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172당신이 사용하는 게 아니라요?교과서 변경

Sanders 3rd Edition

Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective

문제 27

16장, 문제 27

What is the difference between biochemical and biological function?

검증된 단계별 안내

Understand that 'biochemical function' refers to the specific chemical reactions or molecular interactions that a molecule, such as a protein or enzyme, performs. For example, an enzyme's ability to catalyze a reaction by binding to a substrate is its biochemical function.

Recognize that 'biological function' refers to the role that the molecule or process plays in the context of the organism's physiology or development. For example, the biological function of hemoglobin is to transport oxygen in the blood.

Differentiate the two by noting that biochemical function focuses on the molecular level (e.g., binding, catalysis), while biological function considers the broader context of how that activity contributes to the organism's survival or reproduction.

Consider examples to clarify the distinction: The biochemical function of DNA polymerase is to synthesize DNA by adding nucleotides to a growing strand, while its biological function is to ensure accurate DNA replication during cell division.

Summarize the difference: Biochemical function is about the 'how' at the molecular level, while biological function is about the 'why' in the context of the organism's needs and processes.

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Biochemical Function

Biochemical function refers to the specific chemical processes and reactions that occur within living organisms. This includes the roles of enzymes, hormones, and metabolic pathways that facilitate the transformation of substances, energy production, and the synthesis of biomolecules. Understanding biochemical functions is crucial for grasping how molecular interactions drive cellular activities.

Biological Function

Biological function encompasses the broader roles that biological systems and organisms play in their environments. This includes processes such as reproduction, growth, adaptation, and interaction with other organisms. While biochemical functions are foundational to biological functions, the latter also considers ecological and evolutionary contexts that influence how organisms behave and survive.

Interrelationship Between Biochemical and Biological Functions

The interrelationship between biochemical and biological functions highlights how molecular processes underpin larger biological activities. For instance, the biochemical pathways that produce energy (like cellular respiration) are essential for an organism's growth and reproduction. Understanding this connection is vital for comprehending how life operates at both molecular and organismal levels.

관련 실천

교과서 질문

In conducting the study described in Problem 24, you have noted that a set of S. cerevisiae genes are repressed when yeast are grown under high-salt conditions. How might you approach this question if genome sequences for the related Saccharomyces species S. paradoxus, S. mikatae, and S. bayanus were also available?

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교과서 질문

Describe how enhancer screens can be used to uncover genetic redundancy.

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교과서 질문

Using the two-hybrid system to detect interactions between proteins, you obtained the following results: A clone encoding gene A gave positive results with clones B and C; clone B gave positive results with clones A, D, and E but not C; and clone E gave positive results only with clone B. Another clone F gave positive results with clone G but not with any of A–E. Can you explain these results? To follow up your two-hybrid results, you isolate null loss-of-function mutations in each of the genes A–G. Mutants of genes A, B, C, D, and E grow at only 80% of the rate of the wild type, whereas mutants of genes F and G are phenotypically indistinguishable from the wild type. You construct several double-mutant strains: The ab, ac, ad, and ae double mutants all grow at about 80% of the rate of the wild type, but af and ag double mutants exhibit lethality. Explain these results. How do the two-hybrid system and genetic interaction results complement one another? Can you reconcile your two-hybrid system and genetic interaction results in a single model?

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교과서 질문

Describe at least two mechanisms by which duplicate genes arise. What are the possible fates of duplicate genes? Does the mode of duplication affect possible fates?

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교과서 질문

In conducting the study described in Problem 24, you have noted that a set of S. cerevisiae genes are repressed when yeast are grown under high-salt conditions. How might you determine whether this set of genes is regulated by a common transcription factor?

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교과서 질문

PEG10 (paternally expressed gene 10) is a paternally expressed gene (meaning only the paternal allele is expressed) that has an essential role in the formation of the placenta of the mouse. In the mouse genome, the PEG10 gene is flanked by the SGCE and PPP1R9A genes. To study the origin of PEG10, you examine syntenic regions spanning the SGCE and PPP1R9A loci in the genomes of several vertebrates, and you note that the PEG10 gene is present in the genomes of placental and marsupial mammals but not in the platypus, chicken, or fugu genomes.

The green bars in the figure indicate the exons of each gene. The gray bars represent LINEs and SINEs, and the blue bars represent long terminal repeat (LTR) elements of retrotransposons. Solid black diagonal lines link introns, and dashed black lines connect orthologous exons. Arrowheads indicate the direction of transcription.

Using the predicted protein sequence of PEG10, you perform a tblastn search for homologous genes and find that the most similar sequences are in a class of retrotransposons (the sushi-ichi retrotransposons). Propose an evolutionary scenario for the origin of the PEG10 gene, and relate its origin to its biological function.

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