Which of the following vitamins is fat-soluble and, consequently, can be stored in body fat?
A) biotin
B) pantothenic acid
C) niacin
D) K
Answer: D
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Congenital non-spherocytic haemolyic anaemia (CNSHA) is caused by a mutation of one or more of the enzymes of the glycolytic pathway. The most common is a mutation in the gene for pyruvate kinase resulting in a non-functional enzyme. Patients with CNSHA often show marked ATP deficiencies. Given what you know about this enzyme’s action, why would this be expected?
a. Pyruvate kinase produces ATP when it phosphorylates glucose to glucose-6-phosphate. b. Pyruvate kinase uses excess ATP when it phosphorylates fructose-6-phosphate. c. Pyruvate kinase produces ATP when it generates pyruvate from phosphophoenolpyruvate (PEP). d. Pyruvate kinase uses excess ATP when it catalyzes the dehydration of 2-phosphoglycerate.
Select the correct sequence of vertebrate development beginning with fertilization.
A. fertilization ? cleavage ? gastrulation ? neurulation ? organogenesis ? neural crest formation B. fertilization ? gastrulation ? cleavage ? neurulation ? neural crest formation ? organogenesis C. fertilization ? neurulation ? gastrulation ? organogenesis ? neural crest formation ? cleavage D. fertilization ? gastrulation ? neurulation ? neural crest formation ? cleavage ? organogenesis E. fertilization ? cleavage ? gastrulation ? neurulation ? neural crest formation ? organogenesis
What is the partial pressure of oxygen at the start of the systemic capillary beds?
a. 40 mm Hg b. 100 mm Hg c. 70 mm Hg d. 104 mm Hg e. 130 mm Hg
Which of the following is NOT involved in nitrogen
fixation? a. breaking triple bonds b. production of NH3 c. production of NO3– d. production of NH4+ e. All of these are involved in nitrogen fixation