Which of the following is NOT involved in turning off the lac operon?
a. the short lifespan of mRNA molecules
b. the short lifespan of the lac operon gene products
c. the depletion of lactose from the cytosol
d. the lack of allolactose to bind to the repressor
e. binding of repressor to the operator
E
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The skin gills of sea stars are structures
a. for the exchange of gases and excretion of ammonia. b. of defense. c. for movement. d. that produce the skeletal elements.
All but which factor were important evolutionary adaptations in primates?
a. enhanced stereoscopic vision b. upright position c. an opposable thumb d. the development of a restricted or specialized diet e. brain expansion and elaboration
Restriction enzymes are used in genetic engineering to cut DNA between specific base pairs in a DNA strand, resulting in DNA segments that are then used for further study and analysis
Indicate whether the statement is true or false
Proton pumps are used in photosynthesis
A. to pump protons into the thylakoid. B. between photosystem II and photosystem I. C. during the light-dependent reaction sequence. D. All of the choices are correct.