Chapter 9: Vitamin B7 (Biotin)

Question 1

other names:

anti-egg white injury factor
bios i
vitamin h
coenzyme r

Answer 1

biotin

Question 2

biotin - chemistry

-sulfur-containing vitamin
-crystalline in its free form

Answer 2

-

Question 3

biotin - chemistry

stable to (3)

Answer 3

heat, light, and acids

Question 4

biotin - chemistry

unstable in (2)

Answer 4

alkali and oxidation

Question 5

biotin - chemistry

produced by intestinal bacteria in the form of _____, a biologically active derivative; combined with the amino acid lysine

Answer 5

biocytin

Question 6

biotin - chemistry

inactivated by _____, protein in raw egg whites

Answer 6

avidin

Question 7

biotin - absorption, transport, and utilization

most absorption of biotin takes place in the upper portion of the _____ requiring a sodium-activated system

Answer 7

small intestine

Question 8

biotin - function

converts pyruvate to oxaloacetate; gluconeogenesis

Answer 8

pyruvate decarboxylase

Question 9

biotin - function

forms malonyl coa from acetate: fatty acid synthesis

Answer 9

acetyl coa carboxylase

Question 10

biotin - function

converts propionate to succinate: amino acid metabolism

Answer 10

propionyl coa carboxylase

Question 11

converts beta mcc to beta-methylglutaconyl coa: amino acid metabolism

Answer 11

beta-methylcrotonyl coa

Question 12

biotin - function

participates in the _____ of aspartic acid, threonine, and serine

Answer 12

deamination

Question 13

biotin - function

synthesis of _____ and _____

Answer 13

pancreatic amylase and nicotinic acid

Question 14

biotin - function

plays a role in _____ formation

Answer 14

antibody formation

Question 15

biotin - function

involved in many cellular reactions, particularly in fat and chon metabolism of hair roots, fingernails, and skin

Answer 15

-

Question 16

biotin - deficiency

is rare; results from a rare genetic deficiency in _____, enzyme in the gut mucosa that can occur in about 1 to 40,000 infants

Answer 16

biotinidase

Question 17

biotin - deficiency

biotinidase can also occur in individuals who consume _____ (6 per day) over many months because these contain a protein called avidin that binds biotin making it unavailable for utilization

Answer 17

raw egg whites

Question 18

biotin - recommended intake

for conditions with: achlorydia, alcoholism, excessive egg white intake, sulfonamide therapy pregnancy and lactation, epileptics, and elderly

Answer 18

increased biotin intake

Question 19

egg yolk, kidney, liver, milk, molasses, and yeast

Answer 19

biotin food sources