Hydrogen ion flow out of the thylakoid compartments ____
a. occurs between photosystems I and II
b. is called the hydrogen transfer system
c. provides energy to produce ATP molecules
d. causes excitation of chlorophyll molecules
e. requires the intermediary action of acceptor molecules
ANSWER: c
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Answer the following statements true (T) or false (F)
1. Animal biomass exceeds plant biomass in most ecosystems. 2. Air pollutants can increase heritable mutations. 3. Insect densities tend to decrease in elevated CO2, all things being equal. 4. Biomagnification of chemicals such as DDT results in lower trophic levels becoming enriched in these chemicals.
Which addition to a DNA sequence would not cause a frameshift mutation?
A) T B) GC C) GCT D) GGCT
The collective human ecological footprint is now much larger than Earth's sustainable resource base
Indicate whether the statement is true or false
Which of the following cell types produce antibodies?
a) t- cells b) dendritic cells c) b- cells d) natural killer cells