What elemental compound comprises up to 95% of the mass of a diatom's cell wall?
a. silica (SiO2)
b. calcium carbonate
c. magnesium carbonate
d. calcium sulfate
e. sodium bicarbonate
a
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All bacteria
A) are heterotrophs. B) are harmful to humans. C) reproduce sexually. D) are prokaryotes.
Does the location of the ITCZ appear to be related to the formation
of tropical cyclones? Use examples from the Northern and Southern
Hemisphere to support your position. What will be an ideal response?
Electricity generation through urban waste incineration is an example of ________ power generation
Fill in the blank(s) with correct word
Which of the following correctly describes the interactions between antigens, class II MHC molecules and T cells?
A) Antigens bound to class II MHC molecules and interact with helper T cells B) Antigens bound to class II MHC molecules and interact with killer T cells C) both a and b D) neither a nor b