A new experimental pesticide is being tested by a large agricultural chemical company. An unfortunate side effect in plants treated with this new product is a decrease in NADPH production in the chloroplasts
(Interestingly, reduction of NAD+ to NADH in the mitochondria is unaffected.) Given this observation, which of the following would you expect to observe in
the chloroplasts of these plants?
A. an increase in 3-phosphoglycerate levels
and a decrease in RuBP production
B. a decrease in 3-phosphoglycerate levels
and an increase in RuBP
C. an increase in glyceraldehyde-3-
phosphate production
D. an increase in 3-phosphoglycerate
production and an increase in RuBP
A
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
What causes the formation of a polyribosome in prokaryotic transcription?
a. initiation of transcription and the formation of the transcription bubble b. termination of transcription when polymerase stalls in the A-T-rich regions c. multiple instances of translation on the same mRNA d. binding of polymerase to the promoter region
Which cells in our body possess the MHC II protein?
A. Thymus cells B. Neurons C. Macrophages D. Nasal epithelial cells E. Erythrocytes
Release of what protein is directly subject to negative feedback inhibition when blood volume rises?
A. angiotensinogen B. aldosterone C. angiotensin II D. renin E. atrial natriuretic hormone