Which structural and functional feature(s) listed are key to an enzyme's activity?
A) consists of a three-dimensional protein structure that interacts with a substrate in a fixed "lock-and-key" model
B) consumed each time a reaction takes place and consists of a three-dimensional protein structure that interacts with a substrate in a fixed "lock-and-key" model
C) consumed each time a reaction takes place and contains an active site where the enzyme can interact with a specific substrate
D) consumed each time a reaction takes place
E) contains an active site where the enzyme can interact with a specific substrate
Answer: E
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After reviewing the graph below, one could state that:
A. grain yield of strain 1 is less dependent than strain 2 on the nitrogen enrichment of the soil. B. at a nitrogen enrichment of 40 kg/hectare, strain 2 provides a higher yield of grain. C. nitrogen enrichment has little effect on grain yield of strain 2. D. strain 1 is the superior choice for grain yield. E. no interaction effect is observed between nitrogen enrichment and grain yield for either strain.
Increased concentrations of carbon dioxide (CO2) (5% to 10%) and approximately 15% oxygen (O2) produce an environmental condition that best suits which type of organism?
a. Aerobes b. Anaerobes c. Capnophiles d. Microaerophiles
The number of copies of a DNA sequence produced by the polymerase chain reaction depends on the
number of cycles of the reaction. Indicate whether the statement is true or false.
In mammals, the midbrain consists of the superior colliculi and the inferior colliculi
____________________ Indicate whether the statement is true or false.