Exam 3: Carbohydrates

Gluconeogenesis is essentially the reversal of which pathway?

Starches in the duodenum and jejunum are acted upon by ____.

Glucagon,epinephrine,and norepinephrine enhance the regulation of ____.

What is the key enzyme in digestion of polysaccharides?

Match the enzymes with the pathway in which they function in carbohydrate metabolism. -pyruvate carboxylase

Glucose phosphorylation in the liver is catalyzed by glucokinase.

Because they do not have mitochondria,red blood cells generate a lot of lactate from glycolysis,which they in turn must convert into glucose to meet their energy needs.

According to the USDA data for the year 2010,most of the carbohydrates in the American diet came from ____.

The muscle is an important tissue in gluconeogenesis because it can use amino acids from protein breakdown and convert them to glucose,which it then secretes into the circulation for other tissues.

Match the enzymes with the pathway in which they function in carbohydrate metabolism. -glucose-6-phosphate dehydrogenase

Insulin is an anabolic hormone.Which process does insulin stimulate?

Conversion of phosphorylase b to the active phosphorylase a is carried out by ____.

The conversion of pyruvate to oxaloacetate in gluconeogenesis allows which molecules to enter the gluconeogenic pathway?

Glycogenesis,glycogenolysis,gluconeogenesis,and glycolysis are tissue-specific-that is,either the pathway or certain aspects of the pathway are different for different tissues.Pick ONE metabolic process and describe what occurs,including what tissues are involved and any tissue-specific differences.Make sure to indicate any and all signals involved in this process.

What are the major dietary energy sources that are composed of two simple sugars?

Maintenance of normal blood glucose concentration is controlled by the small intestine,the liver,the kidneys,skeletal muscle,and adipose tissue.

A ketopentose is a carbohydrate containing ____.

Match the enzymes with the pathway in which they function in carbohydrate metabolism. -phosphofructokinase

Which substance is converted into glycogen in the process of glycogenesis?

In what part of the cell does glycolysis occur?