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.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Compare and contrast synthesis reactions with decomposition reactions

What will be an ideal response?

Biology & Microbiology

In small communities lacking municipal sewage systems, sewage is treated in septic systems or oxidation ponds

Indicate whether the statement is true or false

Biology & Microbiology