I scream for ice cream case study answer key

Crisp, coffee-colored, plaid and symmetrical is how I imagine the human mind to be at an adolescent age. Lacking experience, yet, craving it.

The perimeter is limited and confined. The creators do everything and anything to mold it to perfection; worried customers will come with complaints or be offended. This cone becomes a base that every individual shares. It is how we communicate and relate to one another. The contents begin where the cone ends. It is an amalgamation of flavors, colors, and amounts, with endless combinations.

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But then you come across an unfamiliar flavor, incomparable, yet, utterly enjoyable. Small doses are taken to preserve the taste and curiosity rises exponentially as you continue the dessert. It is an original: exactly what I strive to be. Just like the contents of a cone, education, knowledge, and purpose is what fills our minds. An individual, whether they choose to accept it or not, is solely based on what they have to offer.

In a more universal thought, what people have to offer to the world becomes their “mission” or “purpose”. So as I see it, molding is a waste of time, because every individual has a distinct calling. What I want from a university is everything except a formal education; I want to slowly seep out of everything that is a mold or cone. I want to go beyond the confines of all institutions and paradigms and come out victorious. Besides, who doesn’t enjoy a sweet mess?

Lactase Persistence in Humans

By Nadia Sellami, Julie A. Morris, Sheela Vemu

I scream for ice cream case study answer key

Abstract

Lactose intolerance, caused by a lack of persistent lactase enzyme expression, is a trait commonly observed in adult humans, with varying geographic prevalence depending on dietary habits in different cultures. This case study follows a diverse group of undergraduate students on their quest to understand why some humans are able to digest lactose and others cannot. Students are asked to use quantitative reasoning to explore the geographic distribution of the trait of lactose intolerance as well as the enzymatic activity of the lactase enzyme. Students then explore eukaryotic gene regulation and how single nucleotide polymorphisms (SNPs) can affect the expression of the lactase gene. Students are asked to correlate genotypic data with phenotypic observations. Finally, students explore the effect of environmental factors on the evolution and geographic distribution of the lactase persistence trait by generating concept maps. The case was developed for introductory biology courses up to introductory molecular biology courses at the college level and emphasizes quantitative reasoning as well as integrating different concepts using the topic of lactose intolerance.

Date Posted

Overview

Objectives

  • Describe and analyze enzymatic reactions using key terms and quantitative data.
  • Differentiate between monosaccharides, disaccharides, proteins and enzymes.
  • Describe the chemical reaction catalyzed by the lactase enzyme.
  • Predict the effect of the enzymatic activity of an enzyme such as lactase on a measurable product concentration such as blood glucose levels using quantitative data and graphs.
  • Describe the effect of small genetic differences in individuals such as SNPs on eukaryotic gene regulation.
  • Describe the eukaryotic transcription initiation and regulation machinery.
  • Explain how a SNP or other DNA mutation can alter protein binding and affect gene expression.
  • Evaluate the effect of DNA sequence alterations on the transcriptional efficiency of a eukaryotic gene.
  • Explain the importance of mutations and the effects of environmental factors on natural selection and evolution.

Keywords

lactose, lactose intolerance, lactase, evolution, enzymes, regulation of gene expression, DNA sequence analysis, enhancer, SNP, transcription

Subject Headings

Biochemistry

Biology (General)

Cell Biology

Evolutionary Biology

Genetics / Heredity

Molecular Biology

Undergraduate lower division, Undergraduate upper division

Teaching Notes & Answer Key

Teaching Notes

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Answer Key

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Materials & Media

Supplemental Materials

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