A molecule that is a combination of two or more different elements in a fixed ration, is called a ___.
Fill in the blank(s) with the appropriate word(s).
molecule and a compound
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Diphtheria is a contagious disease that spreads from person to person mainly by the fecal-oral route.
Answer the following statement true (T) or false (F)
Each carbon atom can share pairs of electrons with as many as ________ other atom(s)
Fill in the blank(s) with correct word
What is the function of endosperm?
a. food for animal pollinators in flowers that don’t have nectar b. food for the sprouting seedling c. food for developing pollen grains d. food for the growing pollen tube e. food for the developing fruit
The bacterium that causes botulism disease is harmless until it:
a. is infected by lytic bacteria. b. is infected by certain retroviruses. c. contains a certain prophage DNA. d. is irradiated by UV radiation. e. is infected by prions