After re-folding the protein lolcat31, you perform gel filtration to complete the purification. You calculate the size of lolcat31 to be 35,000 daltons from its amino acid sequence. Instead, however, the protein elutes at 140,000 daltons. Addition of Triton X-100, a chemical used by biochemists to disrupt hydrophobic interactions, causes the protein to elute at 70,000 daltons. a. lolcats31 contains two polypeptide chains, all of which are held together by hydrophobic forces
b. lolcats31 contains four polypeptide chains, two of which are held together by hydrophobic forces
c. lolcats31 contains two polypeptide chains, all of which are held together by disulfide bridges (-S-S-)
d. lolcats31 contains four polypeptide chains, and is entirely denatured by addition of Triton-X100
e. lolcats31 contains four polypeptide chains, all of which are held together by hydrophobic forces.

picture a world where computers are building made-to-order personalized robotic arms and synthetic organs, drones are circulating above mars! due to the rapid growth of technology, the future has never been more unpredictable, and it presents a huge challenge in education: we are teaching students how to work in a future that we have never been unsure of. it is widely predicted that in eight years’ time, there will be more jobs in the fields of science, mathematics, technology and engineering than in any other discipline. and, as the technology continues to develop, it will soon become clear that addressing social problems will involve more innovative thinking, and analytical and technical knowledge than ever before. undeniably, there are no subjects that encourage innovative and creative thinking, deep thought, problem solving and independence more than the stem subjects. while it is widely commented on that there is a need to reimagine the ways stem subjects are taught in schools by embracing a more interactive and innovative approach to appeal to more students, it should come as no surprise that some of the most reputable educational organizations in the world are already implementing changes to embrace stem. harvard, for example, announced in 2014 that they were increasing their computer science faculty by over 50% and has since introduced computer science as a core subject for all freshmen. the urgency of supporting stem subjects at a young age is becoming more relevant than ever, as adopting a keen interest in the curricula needs to happen early. however, beyond the age issue is one of gender.

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weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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