{"id":46518,"date":"2025-07-02T07:03:28","date_gmt":"2025-07-02T07:03:28","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=46518"},"modified":"2025-07-02T07:03:30","modified_gmt":"2025-07-02T07:03:30","slug":"glucose-fatty-acids-acetyl-coa-leucine-hmg-coa-hmg-coa-reductase-mevalonic-acid-mevalonate-kinase-isopentenyl-pyrophosphate-isopentenyl-trnas-farnesylpyrophosphate-dolichol-squalene-haem-a-lanostero","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/glucose-fatty-acids-acetyl-coa-leucine-hmg-coa-hmg-coa-reductase-mevalonic-acid-mevalonate-kinase-isopentenyl-pyrophosphate-isopentenyl-trnas-farnesylpyrophosphate-dolichol-squalene-haem-a-lanostero\/","title":{"rendered":"Glucose Fatty acids Acetyl-CoA Leucine HMG-CoA HMG-CoA reductase Mevalonic acid Mevalonate kinase Isopentenyl pyrophosphate Isopentenyl tRNA’s Farnesylpyrophosphate Dolichol Squalene Haem A Lanosterol Ubiquinone 7-Dehydrocholesterol Desmosterol Steroid hormones Bile acids Cholesterol"},"content":{"rendered":"\n

Glucose Fatty acids Acetyl-CoA Leucine HMG-CoA HMG-CoA reductase Mevalonic acid Mevalonate kinase Isopentenyl pyrophosphate Isopentenyl tRNA’s Farnesylpyrophosphate Dolichol Squalene Haem A Lanosterol Ubiquinone 7-Dehydrocholesterol Desmosterol Steroid hormones Bile acids Cholesterol<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Correct Answer<\/strong>
Glucose, Fatty acids, Acetyl-CoA, Leucine, HMG-CoA, HMG-CoA reductase, Mevalonic acid, Mevalonate kinase, Isopentenyl pyrophosphate, Isopentenyl tRNA’s, Farnesylpyrophosphate, Dolichol, Squalene, Haem A, Lanosterol, Ubiquinone, Desmosterol, 7-Dehydrocholesterol, Cholesterol, Steroid hormones, Bile acids.<\/p>\n\n\n\n

Explanation<\/strong>
The provided image illustrates the mevalonate pathway, a critical metabolic route responsible for the synthesis of cholesterol and other essential isoprenoid compounds in animal cells. The pathway begins with the two-carbon molecule Acetyl-CoA, which serves as the primary building block. Acetyl-CoA can be derived from multiple sources, including the breakdown of glucose through glycolysis, the oxidation of fatty acids, or the catabolism of certain amino acids like leucine.<\/p>\n\n\n\n

Multiple Acetyl-CoA units condense to form HMG-CoA (3-hydroxy-3-methylglutaryl-CoA). The subsequent conversion of HMG-CoA to mevalonic acid is a pivotal and tightly regulated step. This reaction is catalyzed by the enzyme HMG-CoA reductase and is the rate-limiting step of the entire pathway. The diagram shows a negative feedback loop, indicated by the dotted line from cholesterol, signifying that high levels of cholesterol inhibit the activity of HMG-CoA reductase, thus self-regulating its own production. This enzyme is the primary target for statin drugs, which are widely used to lower cholesterol levels.<\/p>\n\n\n\n

Mevalonic acid is then converted through several steps, involving the enzyme mevalonate kinase, into isopentenyl pyrophosphate (IPP). IPP is a fundamental five-carbon isoprenoid unit. It can be used for synthesizing other molecules like isopentenyl-tRNAs. Successive condensations of IPP units lead to the formation of farnesyl pyrophosphate (FPP).<\/p>\n\n\n\n

FPP represents a major branch point in the pathway. While some FPP is directed towards cholesterol synthesis by forming squalene, a significant portion is diverted to produce other vital non-sterol compounds. As shown in the diagram, these include dolichol (involved in glycoprotein synthesis), haem A (a component of cytochrome c oxidase in the electron transport chain), and ubiquinone (Coenzyme Q10), another crucial electron carrier.<\/p>\n\n\n\n

The main pathway continues with squalene cyclizing to form lanosterol, the first sterol intermediate. Lanosterol then undergoes a complex series of enzymatic modifications, proceeding through intermediates like desmosterol or 7-dehydrocholesterol, to finally yield cholesterol. Cholesterol itself is not just an end product; it is a vital component of cell membranes and serves as the precursor for the synthesis of all steroid hormones and bile acids<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

Glucose Fatty acids Acetyl-CoA Leucine HMG-CoA HMG-CoA reductase Mevalonic acid Mevalonate kinase Isopentenyl pyrophosphate Isopentenyl tRNA’s Farnesylpyrophosphate Dolichol Squalene Haem A Lanosterol Ubiquinone 7-Dehydrocholesterol Desmosterol Steroid hormones Bile acids Cholesterol The Correct Answer and Explanation is: Correct AnswerGlucose, Fatty acids, Acetyl-CoA, Leucine, HMG-CoA, HMG-CoA reductase, Mevalonic acid, Mevalonate kinase, Isopentenyl pyrophosphate, Isopentenyl tRNA’s, Farnesylpyrophosphate, Dolichol, […]<\/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-46518","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/46518","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=46518"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/46518\/revisions"}],"predecessor-version":[{"id":46527,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/46518\/revisions\/46527"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=46518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=46518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=46518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}