In which part of a sponge's body does fertilization occur?
A. the ostium.
B. the mesohyl.
C. the spicule.
D. the spongin.
E. the amoebocyte.
B. the mesohyl.
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In the trp operon, __________ in the absence of tryptophan.
a) all of the choices are correct b) the trp operon structural genes are transcribed c) the operator site is open to allow RNA polymerase binding d) the tryptophan-synthesizing enzymes of the trp operon are synthesized
Which of the following is the reason why the sub-Saharan population projections for the year 2025 have been scaled back from 1.33 billion to 1.05 billion people?
A. famine B. drought C. AIDS D. tuberculosis E. malaria
Compare and contrast synthesis reactions with decomposition reactions
What will be an ideal response?
In small communities lacking municipal sewage systems, sewage is treated in septic systems or oxidation ponds
Indicate whether the statement is true or false