Few Tricky Biology Multiple Choice Questions

Which is true? Photorespiration…
Question 13 options:
A)
reduces C-fixation efficiency
B)
occurs in C3 plants
C)
is overcome in C4 plants
D)
all of the above

Mitochondria and chloroplasts are very similar in all of the following characteristics except one. Which of the following is NOT true for both?
Question 14 options:
A)
Both are surrounded by a pair of membranes
B)
Both contain a cyclical chemical pathway
C)
Both contain a membrane-bound electron transport chain
D)
both contain their own genetic system
E)
Both organelles are capable of producing organic molecules from carbon dioxide and water



Which is false?
Question 15 options:
A)
fatty acids can enter Krebs cycle through a process called ?-oxidation
B)
ATP can inhibit the enzyme phosphofructokinase
C)
Too much NADH can inhibit pyruvate decarboxylase
D)
DNA is often broken down to enter Krebs Cycle




G3P is a useful product for green plants because it
Question 17 options:
   
is the precursor of many organic molecules
   
closely resembles ATP
   
yields more energy than glucose when oxidized
   
a) and b)
   
a) and c)


After three revolutions of the Calvin-Cycle, _____ molecule(s) of ___________ is               (are) produced

Question 18 options:
   A)   
three, CO2
   B)   
one, glucose
   C)   
one, G3P
   D)   
three, G3P
   E)   
one, citrate


Which of the following represents a biochemical crossroads for glucose oxidation,      fatty acid catabolism, and the catabolism of some amino acids?

Question 19 options:
   A)   
glucose-6 phosphate
   B)   
acetyl-CoA
   C)   
oxaloacetic acid
   D)   
PEP
   E)   
Neoglycogenesis



As a result of the light reactions, ___________ is(are) available to provide energy for ____________

Question 22 options:
   A)   
ATP and NADPH, the oxidation of chlorophyll
   B)   
ADP and NADP; the oxidation of chlorophyll
   C)   
ATP; the reduction of NADP
   D)   
NADP; the phosphorylation of ADP
   E)   
ATP and NADH; the fixation of carbon

All of the pigments, electron carriers, and enzymes necessary for ___________ of photosynthesis are located in (on) ____________

Question 21 options:
   A)   
the light reactions; the thylakoids
   B)   
the light reactions, the stroma
   C)   
the Calvin-Cycle, the thylakoids
   D)   
both reactions, the thylakoids
   E)   
both reactions; the stroma