Please explain your thinking whether the mutations that cause cancer (stabilize the active form of grass) make the amino acids phenylalanine or glycine.<\/p>\n\n\n\n
The correct answer and explanation is:<\/strong><\/mark><\/p>\n\n\n\n Correct Answer: Phenylalanine<\/strong><\/p>\n\n\n\n Mutations that cause cancer by stabilizing the active form of Ras<\/strong> (a small GTPase in the RAS-MAPK signaling pathway) are often associated with phenylalanine<\/strong>, not glycine.<\/p>\n\n\n\n To understand why, we need to look at the RAS protein<\/strong> and its role in cell signaling. RAS switches between an active GTP-bound<\/strong> form and an inactive GDP-bound<\/strong> form. This cycling is tightly regulated. However, mutations in the RAS gene<\/strong> (especially KRAS<\/strong>, HRAS<\/strong>, and NRAS<\/strong>) can disrupt this balance and keep Ras in its active, GTP-bound state, promoting constant cell division \u2014 a hallmark of cancer.<\/p>\n\n\n\n One common mutation involves a change at codon 12<\/strong> (which normally codes for glycine<\/strong>) in the RAS gene. Mutations at this codon often replace glycine with another amino acid<\/strong>, such as phenylalanine<\/strong>, valine<\/strong>, or aspartic acid<\/strong>. When glycine is substituted with phenylalanine, the bulky and hydrophobic side chain of phenylalanine interferes with GTP hydrolysis<\/strong>. This means RAS cannot return to its inactive GDP-bound state, leading to persistent activation of downstream signaling pathways that promote uncontrolled growth and proliferation<\/strong>.<\/p>\n\n\n\n In short:<\/p>\n\n\n\n Therefore, while glycine is the original residue<\/strong>, the mutant form associated with cancer involves phenylalanine<\/strong> (or other amino acids) replacing glycine \u2014 and these changes stabilize Ras in its active form.<\/p>\n\n\n\n Mutations that cause cancer typically involve glycine being replaced<\/strong> by phenylalanine<\/strong> or other amino acids at a key site in Ras, which stabilizes the active form<\/strong> of the protein. So the correct answer is phenylalanine<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":" Please explain your thinking whether the mutations that cause cancer (stabilize the active form of grass) make the amino acids phenylalanine or glycine. The correct answer and explanation is: Correct Answer: Phenylalanine Explanation (\u2248300 words): Mutations that cause cancer by stabilizing the active form of Ras (a small GTPase in the RAS-MAPK signaling pathway) are […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-16342","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/16342","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=16342"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/16342\/revisions"}],"predecessor-version":[{"id":16344,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/16342\/revisions\/16344"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=16342"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=16342"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=16342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation (\u2248300 words):<\/h3>\n\n\n\n
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Summary:<\/h3>\n\n\n\n