#4 - 🧪 [EDIT]Carbohydrates pp18-22

What is the classic empiric chemical formula that defines carbohydrates as compounds containing Carbon, Hydrogen, and Oxygen?
(CH2O)n
(CnH2O)n
(CHO)n
(CH2)nO

Which of the following describes a primary function of carbohydrates in human physiological systems?
Major energy source providing glucose
Primary catalyst for amino acid replication
Inorganic buffer system for blood pH stabilization
Exclusive building block for skeletal muscle sarcomeres

What term defines carbohydrates consisting of a single sugar unit, such as glucose, fructose, or galactose?
Monosaccharides
Disaccharides
Oligosaccharides
Polysaccharides

What term defines carbohydrates consisting of more than 10 sugar units linked together, such as starch, glycogen, and cellulose?
Polysaccharides
Oligosaccharides
Disaccharides
Monosaccharides

Carbohydrates in the diet constitute about what percentage of the total calories in an average human diet?
50%
10%
30%
90%

What alternative bio-name is given to salivary amylase, which acts to break down carbohydrate polymers into dextrins and disaccharides?
Ptyalin
Amylopsin
Sucrase
Lactase

What alternative bio-name is given to pancreatic amylase, which continues the breakdown of carbohydrate polymers in the digestive tract?
Amylopsin
Ptyalin
Maltase
Hexokinase

The hydrolysis of Sucrose by the specific enzyme sucrase yields which monosaccharide products?
Glucose + fructose
Glucose + galactose
Glucose + glucose
Fructose + galactose

The hydrolysis of Lactose by the specific enzyme lactase yields which monosaccharide products?
Glucose + galactose
Glucose + fructose
Glucose + glucose
Fructose + fructose

The hydrolysis of Maltose by the specific enzyme maltase yields which monosaccharide products?
Glucose + glucose
Glucose + fructose
Glucose + galactose
Fructose + galactose

After glucose enters a cell, it immediately undergoes phosphorylation into glucose-6-phosphate through the action of which specific enzymes?
Hexokinase or glucokinase
Amylopsin or ptyalin
Sucrase or maltase
Phosphofructokinase or aldolase

According to the Bishop pathways of glucose metabolism, what is the definition of Glycolysis?
Metabolism of a glucose molecule to pyruvate or lactate for production of energy
Formation of glucose-6-phosphate from non-carbohydrate sources
Breakdown of glycogen to glucose for use as energy
Conversion of glucose to glycogen for storage

According to the Bishop pathways of glucose metabolism, what is the definition of Gluconeogenesis?
Formation of glucose-6-phosphate from non-carbohydrate sources
Metabolism of a glucose molecule to pyruvate or lactate for production of energy
Conversion of glucose to glycogen for storage
Conversion of carbohydrates to fatty acids

According to the Bishop pathways of glucose metabolism, what is the definition of Glycogenolysis?
Breakdown of glycogen to glucose for use as energy
Conversion of glucose to glycogen for storage
Metabolism of a glucose molecule to pyruvate or lactate for production of energy
Decomposition of fat

According to the Bishop pathways of glucose metabolism, what is the definition of Glycogenesis?
Conversion of glucose to glycogen for storage
Breakdown of glycogen to glucose for use as energy
Formation of glucose-6-phosphate from non-carbohydrate sources
Conversion of carbohydrates to fatty acids

According to the Bishop pathways of glucose metabolism, what is the definition of Lipogenesis?
Conversion of carbohydrates to fatty acids
Decomposition of fat
Breakdown of glycogen to glucose for use as energy
Formation of glucose-6-phosphate from non-carbohydrate sources

According to the Bishop pathways of glucose metabolism, what is the definition of Lipolysis?
Decomposition of fat
Conversion of carbohydrates to fatty acids
Conversion of glucose to glycogen for storage
Formation of glucose-6-phosphate from non-carbohydrate sources

Which hormone is produced by the beta cells of the islets of Langerhans in the pancreas and matures via the sequence Preproinsulin to proinsulin?
Insulin
Glucagon
Cortisol
Somatostatin

Which hormone is produced by the alpha cells of the islets of Langerhans and primarily targets the liver to promote glycogenolysis?
Glucagon
Insulin
Somatostatin
Thyroid hormone

Which statement describes the primary physiological effect of Glucagon on metabolic pathways?
Promotes liver glycogenolysis, increases gluconeogenesis, and inhibits glycolysis
Increases cellular uptake of glucose and promotes hepatic glycolysis
Stimulates lipogenesis while inhibiting lipolysis
Inhibits glucagon and insulin secretion completely

Which hormone increases gluconeogenesis and decreases glucose uptake and utilization by extrahepatic tissues?
Cortisol
Catecholamines
Thyroid hormone
Somatostatin

Which hormone group acts to stimulate glycogenolysis and increases glucose absorption in the small intestines?
Catecholamines
Insulin
Somatostatin
Growth hormone

What is the physiological action of Somatostatin regarding carbohydrate regulation?
Inhibit glucagon and insulin secretion
Increase liver gluconeogenesis and inhibit glycolysis
Inhibit glucose transport through the cellular wall
Stimulate lipogenesis while inhibiting lipolysis

What is the primary role of Growth hormone in the regulation of carbohydrate metabolism?
Inhibits glucose transport
Increases glucose absorption in the small intestines
Promotes liver glycogenolysis directly
Converts glucose to glycogen for storage

What term defines a group of metabolic diseases characterized by hyperglycemia resulting from defects in insulin secretion, insulin action, or both?
Diabetes Mellitus
Glycogenosis
Lipodystrophy
Isosthenuria

Which condition is characterized by an absolute deficiency of insulin caused by an autoimmune attack on the beta cells of the pancreas?
Type 1 Diabetes Mellitus
Type 2 Diabetes Mellitus
Gestational Diabetes Mellitus
Secondary pancreatic diabetes

Which condition is characterized by a combination of insulin resistance and dysfunctional beta cells of the pancreas?
Type 2 Diabetes Mellitus
Type 1 Diabetes Mellitus
Autoimmune diabetes mellitus
Primary insulinopenic diabetes

What historical name is used to describe Type 2 Diabetes Mellitus, reflecting its typical age of presentation?
Adult Onset DM
Juvenile Onset DM
Insulin Dependent DM
Pancreatogenic diabetes

What is the approximate frequency of Type 1 Diabetes Mellitus among all diagnosed cases of diabetes?
5-10%
90-95%
50%
Less than 1%

What is the approximate frequency of Type 2 Diabetes Mellitus among all diagnosed cases of diabetes?
90-95%
5-10%
25-30%
Over 99%

Which specific autoantibodies are associated with the genetic and autoimmune risk profile of Type 1 Diabetes Mellitus?
Anti-islet cell cytoplasmic, insulin autoantibodies, and anti-GAD
Anti-nuclear antibodies, anti-dsDNA, and anti-Smith
Anti-thyroperoxidase and anti-thyroglobulin autoantibodies
Anti-smooth muscle and antimitochondrial antibodies

How do C-peptide levels differ between Type 1 and Type 2 Diabetes Mellitus?
Very low or undetectable in Type 1; Detectable in Type 2
High in Type 1; Detectable in Type 2
Normal in Type 1; Undetectable in Type 2
Low to absent in both Type 1 and Type 2

What characteristic plasma insulin profile is observed in long-standing Type 2 Diabetes Mellitus?
High in early disease; low to absent in disease of long duration
Low to absent from the very beginning of the disease
Consistently high and unregulated throughout all stages
Completely unaffected by the duration of the condition

Which type of Diabetes Mellitus leaves the patient highly prone to ketoacidosis and diabetic complications?
Type 1 Diabetes Mellitus
Type 2 Diabetes Mellitus
Secondary chemical-induced diabetes
Genetic defects of beta cell function

1. What type of medication therapy is considered an absolute necessity for survival in a patient with Type 1 Diabetes Mellitus?
   Insulin via multiple daily injections or an insulin pump
   Oral agents and lifestyle modifications only

Glucagon secretagogues and dietary restrictions
Subcutaneous somatostatin analogue infusions

What standard medication therapy approach is primarily used to manage Type 2 Diabetes Mellitus?
Oral agents, lifestyle, and oral medicines
Insulin pump therapy exclusively
Pancreatic enzyme replacement therapy
Immunosuppressive antibody therapy

What term defines the category of Diabetes Mellitus associated with secondary conditions, such as genetic defects of beta cell function, pancreatic disease, endocrine disease, or drug or chemical induction?
Other specific types of DM
Type 1 Diabetes Mellitus
Type 2 Diabetes Mellitus
Primary gestational diabetes

What specific name is given to pancreatogenic diabetes caused by exocrine pancreatic defects?
Type 3C diabetes
Type 1A diabetes
Type 2B diabetes
Maturity-onset diabetes of the young

Which of the following conditions is an example of an exocrine pancreatic defect that can cause Type 3C diabetes?
Chronic Pancreatitis, Pancreatectomy, Pancreatic cancer, Cystic Fibrosis, Hemochromatosis, and Fibrocalculous pancreatopathy
Autoimmune beta cell destruction and islet cell cytoplasmic atrophy
Pituitary adenoma or excessive growth hormone secretion
Primary insulin receptor mutations and acanthosis nigricans

What condition is defined as glucose intolerance with onset or first recognition during pregnancy, where a large percentage of affected individuals go on to develop Diabetes Mellitus within 5 to 10 years?
Gestational Diabetes Mellitus (GDM)
Type 1 Diabetes Mellitus
Type 2 Diabetes Mellitus
Type 3C Diabetes Mellitus

According to the diagnostic criteria by Bishop, what is the hemoglobin A1c cutoff value for a definitive diagnosis of Diabetes Mellitus?
Greater than or equal to 6.5%
5.7% to 6.4%
Less than 5.7%
Greater than or equal to 7.0%

According to the diagnostic criteria by Bishop, what value of fasting plasma glucose signifies a diagnostic classification of normal?
Less than 100 mg/dL
100 to 125 mg/dL
Greater than or equal to 126 mg/dL
Greater than or equal to 200 mg/dL

According to the diagnostic criteria by Bishop, what range of fasting plasma glucose indicates the pre-diabetic state known as Impaired Fasting Glucose?
100 to 125 mg/dL
Less than 100 mg/dL
140 to 199 mg/dL
Greater than or equal to 126 mg/dL

According to the diagnostic criteria by Bishop, what value of fasting plasma glucose meets the threshold for a definitive diagnosis of Diabetes Mellitus?
Greater than or equal to 126 mg/dL
100 to 125 mg/dL
Less than 100 mg/dL
140 to 199 mg/dL

According to the diagnostic criteria by Bishop, what range of a 2-hour plasma glucose level during an OGTT indicates the pre-diabetic state known as Impaired Glucose Tolerance?
140 to 199 mg/dL
Less than 140 mg/dL
100 to 125 mg/dL
Greater than or equal to 200 mg/dL

According to the diagnostic criteria by Bishop, what range of hemoglobin A1c indicates a pre-diabetic classification?
5.7% to 6.4%
Less than 5.7%
Greater than or equal to 6.5%
Greater than or equal to 7.0%

Under the One-Step IADPSG Consensus procedure for Gestational Diabetes screening, at how many weeks of gestation should a 75-g OGTT be performed in women not previously diagnosed with overt diabetes?
24–28 weeks
12–16 weeks
32–36 weeks
Immediately at the first postpartum visit

Under the One-Step GDM screening guidelines, an overnight fast preceding the morning oral glucose tolerance test must last at least how long?
8 hours
4 hours
12 hours
16 hours

Based on the One-Step IADPSG Consensus guidelines, Gestational Diabetes Mellitus is diagnosed if the fasting plasma glucose value is equal to or exceeds:
92 mg/dL
180 mg/dL
153 mg/dL
126 mg/dL

Based on the One-Step IADPSG Consensus guidelines, Gestational Diabetes Mellitus is diagnosed if the 1-hour plasma glucose value is equal to or exceeds:
180 mg/dL
92 mg/dL
153 mg/dL
200 mg/dL

Based on the One-Step IADPSG Consensus guidelines, Gestational Diabetes Mellitus is diagnosed if the 2-hour plasma glucose value is equal to or exceeds:
153 mg/dL
92 mg/dL
180 mg/dL
140 mg/dL

During patient preparation for an oral glucose tolerance test, individuals must ingest a diet containing at least how much carbohydrates per day for the 3 days preceding the test?
150 grams
50 grams
300 grams
100 grams

Prior to an oral glucose tolerance test, the patient preparation guidelines dictate that the individual should undergo a fast of what duration?
8 to 14 hours
4 to 6 hours
16 to 20 hours
Exactly 24 hours

Venous glucose samples for oral glucose tolerance testing are preferably collected in which color tubes containing sodium fluoride and an anticoagulant?
Gray-top tubes
Red-top tubes
Lavender-top tubes
Green-top tubes

The rate of formation of glycosylated hemoglobin (HbA1c) is directly proportional to the average blood glucose concentration over what preceding timeframe?
Previous 3 months
Previous 2 to 3 weeks
Previous 6 months
Previous 7 days

Which condition will cause a false decrease in the measurement of glycosylated hemoglobin (HbA1c) levels?
Decreased RBC lifespan
Increased RBC lifespan
Iron deficiency anemia
Splenectomy

What analyte serves to monitor glucose control over the past 2 to 3 weeks because its primary protein component possesses a circulating lifespan of 20 days?
Fructosamine (Glycated Albumin)
Glycosylated Hemoglobin (HbA1c)
Random Plasma Glucose
Inulin clearance index

Which clinical condition results in a false decrease in plasma fructosamine measurements?
Hypoalbuminemia
Hyperalbuminemia
Hemolysis
Decreased red blood cell lifespan

At what plasma glucose concentration range are counter-regulatory glycemic factors like glucagon routinely released to counteract hypoglycemia?
65 to 70 mg/dL
50 to 55 mg/dL
80 to 90 mg/dL
Less than 40 mg/dL

At approximately what plasma glucose concentration threshold do observable physical symptoms of hypoglycemia relate directly to the central nervous system?
50 to 55 mg/dL
65 to 70 mg/dL
75 to 80 mg/dL
100 mg/dL

To ensure proper specimen considerations, a fasting blood sugar sample should be obtained after a fasting period of:
8 to 10 hours
12 to 14 hours
3 to 5 hours
16 to 18 hours

At room temperature, unpreserved glucose in whole blood is metabolized through glycolysis at an average rate of:
7 mg/dL per hour
2 mg/dL per hour
15 mg/dL per hour
25 mg/dL per hour

When a whole blood sample is stored under refrigerated conditions at 4°C, glucose levels decrease by approximately what rate?
2 mg/dL per hour
7 mg/dL per hour
10 mg/dL per hour
0 mg/dL per hour

According to Widmann's 11th edition, as little as a 10% contamination of a specimen sample with a 5% dextrose intravenous solution will falsely elevate the measured glucose concentration by:
500 mg/dL or more
100 mg/dL or more
50 mg/dL or more
1000 mg/dL or more

Which historical chemical method for glucose classification belongs to the Alkaline Copper Reduction group?
Follin-Wu, Nelson-Somogyi, Neocuproine, and Benedict's method
Hagedorn-Jensen method
Dubowski condensation method
Hexokinase reference coupled assay

Which chemical method for glucose measurement relies on the Alkaline Ferric Reduction principle?
Hagedorn-Jensen method
Follin-Wu method
Nelson-Somogyi method
Dubowski condensation method

Which automated chemical method for measuring glucose is classified specifically as a condensation method?
Dubowski method
Hagedorn-Jensen method
Nelson-Somogyi method
Neocuproine method

The enzymatic glucose oxidase method is highly specific for reacting exclusively with which form of glucose?
Beta-D-glucose
Alpha-D-glucose
L-glucose
Glucose-6-phosphate

Why is the enzymatic hexokinase method accepted as the reference method and considered more accurate than the glucose oxidase method?
The coupling reaction using G6PDH is highly specific and has less interference
It reacts exclusively with both alpha and beta stereoisomers of D-glucose simultaneously
It relies on a chemical color reduction of cupric ions to cuprous ions
It is completely immune to any background cellular consumption of oxygen

During a hexokinase glucose assay, what substance is measured via its strong and distinctive light absorbance at 340 nm?
NADPH
Glucose oxidase
Reduced chromogen
Hydrogen peroxide

Which statement describes the enzymatic hexokinase method's vulnerability to common biochemical interferences?
Not affected by ascorbic acid or uric acid
Strongly falsely decreased by ascorbic acid
Falsely increased by high levels of uric acid
Severely inhibited by low levels of gross bilirubin contamination

What congenital condition represents the most common form of glycogen storage disease, categorized as Type I, and is inherited as an autosomal recessive trait?
Von Gierke Disease
Pompe Disease
Cori Disease
Andersen Disease

Von Gierke Disease (Type I Glygocen Storage Disease) is characterized clinically by which group of findings?
Hepatomegaly, severe hypoglycemia, metabolic acidosis, ketonemia, and elevated lactate and alanine
Massive general organ enlargement with completely normal outer glycogen branching structures
Normal sized organs displaying abnormally elongated outer branch chains of glycogen
Isolated skeletal muscle weakness paired with a sex-linked inheritance pattern

Which defective enzyme is responsible for the pathology seen in Type I (Von Gierke) Glycogen Storage Disease?
Glucose 6-phosphatase or transport system
Alpha-1,4-Glucosidase (lysosomal)
Amylo-1,6-glucosidase (debranching enzyme)
Branching enzyme (alpha-1,4 to alpha-1,6)

Which defective lysosomal enzyme is responsible for the massive increase in normal-structured glycogen across all organs in Type II (Pompe) Glycogen Storage Disease?
Alpha-1,4-Glucosidase
Glucose 6-phosphatase
Amylo-1,6-glucosidase
Phosphorylase

Which defective enzyme is responsible for the accumulation of glycogen with short outer branches in the muscles and liver in Type III (Cori) Glygocen Storage Disease?
Amylo-1,6-glucosidase (debranching enzyme)
Glucose 6-phosphatase
Branching enzyme (alpha-1,4 to alpha-1,6)
Phosphorylase

Which defective enzyme causes the formation of normal amounts of glycogen with abnormally very long outer branches in the liver and spleen in Type IV (Andersen) Glycogen Storage Disease?
Branching enzyme (alpha-1,4 to alpha-1,6)
Glucose 6-phosphatase
Alpha-1,4-Glucosidase
Phosphorylase

Which defective enzyme limits glycogen breakdown specifically in the muscle tissue in Type V (McArdle) Glycogen Storage Disease?
Phosphorylase
Glucose 6-phosphatase
Amylo-1,6-glucosidase
Phosphofructokinase

Which defective enzyme is responsible for the hepatic accumulation of glycogen seen in Type VI (Hers) Glycogen Storage Disease?
Phosphorylase
Alpha-1,4-Glucosidase
Amylo-1,6-glucosidase
Phosphofructokinase

Which defective enzyme limits muscle glycolysis and leads to moderately increased normal-structured glycogen in Type VII (Tarui) Glycogen Storage Disease?
Phosphofructokinase
Glucose 6-phosphatase
Alpha-1,4-Glucosidase
Phosphorylase kinase

Which glycogen storage disease stands out because it is inherited as a sex-linked trait rather than an autosomal recessive condition?
Type VIII (Defective Phosphorylase kinase)
Type I (Von Gierke)
Type II (Pompe)
Type III (Cori)