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Total cholesterol content in HDL is higher than that of LDL. Group of answer choices True...

Total cholesterol content in HDL is higher than that of LDL.

Group of answer choices

True

False

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Question 581 pts

LDL uptake in cells is mediated by receptors.

Group of answer choices

True

False

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Question 591 pts

Both even- and odd-carbon chain fatty acids are catabolized by beta-oxidation.

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True

False

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Question 601 pts

Carnitine is a carrier for fatty acid for transportation from the cytosol to the mitochondrial matrix.

Group of answer choices

True

False

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Question 611 pts

Acyl Carrier Protein (ACP) is specially used for fatty acid synthesis.

Group of answer choices

True

False

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Question 621 pts

Lung surfactant is a kind of phospholipid.

Group of answer choices

True

False

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Question 631 pts

Sphingolipids play an important role in cardiac tissues.

Group of answer choices

True

False

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Question 641 pts

Isoprene is a five-carbon building unit of steroid molecules.

Group of answer choices

True

False

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Question 651 pts

Arachidonic acid is a precursor molecule for the synthesis of prostaglandins and leukotrienes.

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True

False

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Question 661 pts

The first product of purine nucleotide biosynthesis that contains a complete purine ring (hypoxanthine) is inosine monophosphate.

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True

False

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Question 671 pts

Inositol triphosphate (InsP3) functions as a second messenger to inhibit a cyclic AMP-dependent protein kinase.

Group of answer choices

True

False

Solutions

Expert Solution

1) Total cholesterol content in HDL is higher than that of LDL.

Ans - False, HDL and LDL Cholesterol content are 40mg/dL and 100 mg/ dL respectively.

2) LDL uptake in cells is mediated by receptors.

Ans- True , LDL uptake in cells is mediated through receptor mediated endocytosis.The receptor is present on plasma membrane that internalized LDL ( Low density lipoprotein) and then delivered to lysosome where degradation process took place and cholesterol is released.

3) Both even and odd carbon chain fatty acids are catabolized by beta oxidation.

Ans- True , but final products formed in these 2 cases are different. Even carbon chain fatty acids produce acetyl CoA but odd carbon chain fatty acids produce acetyl CoA and Propionyl CoA.

4) Carnetine is carrier for fatty acids transportation from the cytosol to mitochondrial matrix.

Ans- True, Carnetine carrier system transport fatty acid from cytosol to mitochondria matrix. This is due to inner mitochondrial membrane is impermeable to fatty acid but not Carnetine.Once fatty acid is transported by Carnetine, Carnetine returns back to cytosol.

5) Acyl Carrier protein is used for fatty acid synthesis.

Ans- True, it is component of fatty acid synthesis cycle. It (ACP) catalyzes the addition of thioester to Phosphopentatheine.

6) Lung surfactant is a kind of phospholipid.

Ans- True , There are many kind of surfactants ( phospholipid , triglycerides, Cholesterol, fatty acid) that reduce the surface tension at liquid air interface.

7) Sphingolipid play an important role in Cardiac tissue

Ans- True , Sphingolipid play great role in Cardiac tissue by Cardiogensis, heart maturation and angiogenesis.

8) Isoprene is 5 Carbon building unit of steroid molecule.

Ans- True , Several Isoprene units are required for synthesis of steroid molecule.

9) Arachidonic acid is precursor molecule for the synthesis of Prostaglandin and leukotriens.

Ans -True , Arachidonic acid is intracellular messenger , metabolised by cyclooxygenase and 5 - Lipoxygenase to synthesise Prostaglandin and leukotriens.

10) The first product of purine nucleotide biosynthesis that contain a complete purine ring ( Hypoxanthine) is Ionosine monophosphate.

Ans- True, First product that contain complete purine ring in purine nucleotide biosynthesis is IMP ( Ionosine monophosphate) by ribose- 5 phosphate and PRPP.

11) Ionistol triphosphate ( IP3) functions as second Messenger to inhibit cAMP dependent protein kinase.

Ans - False , IP3 Function as second Messenger that activate cAMP dependent protein kinase.

gladiator answered 1 year ago

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