Biochemistry Answers

Indicate at what carbon atom(s) the structures of each of the following pairs of monosaccharides differ.

______________ a. D-Glucose and D-galactose

______________ b. D-Glucose and D-fructose

______________ c. D-Glyceraldehyde and dihydroxyacetone

______________ d. D-Ribose and 2-deoxy-D-ribose

Write a paragraph of at least 250 words to elucidate your opinion on the following statement:(use Havard referencing)

”Natural Science as a compulsory school subject in the Senior Phase prepare learners for Life Sciences in Grade 10”

Write a paragraph of at least 250 words to elucidate your opinion on the following statement:(use Havard referencing)

”Natural Science as a compulsory school subject in the Senior Phase prepare learners for Life Sciences in Grade 10”

Technicalities

-minimum words;250

-letter type;Arial

-Referencing method;Havard Referencing -Letter orientation; justified

Gerhart and Pardee measured ATCase activity in the presence of a variety of purine and pyrimidine derivatives. Their results are presented in Table 16.2. What compound(s) were the most effective inhibitors? activators? Explain the significance of the metabolites that served as inhibitors or activators in the context of the biosynthetic pathway presented in Figure 16.1.

Table 16.2: Effect of nitrogen bases, nucleosides and nucleotides on ATCase activity. *Indicates stimulation. (Based on Gerhart and Pardee, 1962.)

Compound

Inhibition, % (Conc = 2 mM)

Cytosine

0

Cytidine

24

CMP

38

dCMP

48

CTP

86

dCTP

88

UTP

8

GTP

35

dGTP

31

ATP

-180*

dATP

-162*

In which phase does natural science and technology split into two separate learning areas

Which natural science strand in the senior phase develops into life science in grade 10

1. what is the physiological significance of branching in polysaccharides

What is the cause of lactose intolerance

Based on the known mechanism of the enzyme glyceraldehyde-3-phosphate dehydrogenase predict the outcome of the following situations or reactions. Include a brief justification of your answer for each case. See p 519 of the text for the mechanism – Figure 14.7. Things to consider in answering this question: The acetyl phosphate experiment:NAD+ Glyceraldehyde 3-phosphate ÇH20P03 NAD+ HCOH H Glyceraldehyde 3-phosphate dehydrogenase Cys Cys Formation of enzyme-subsfollow the expected making and breaking of the bonds and what you know about the mechanism.

Predict what would happen if acetyl phosphate (a mixed anhydride of acetic and phosphoric acids) is used as the enzyme substrate in the presence of 32P inorganic phosphate. Hint: A catalyst catalyzes are reaction equally in the forward and in the reverse direction.

Name and describe the five characteristics that define land plants