Single-celled organisms that lack a nucleus belong to the domains Bacteria and ________
Fill in the blank(s) with correct word
Archaea
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Exotoxins can be denatured by iodine to form ________, which are useful in vaccines.
Fill in the blank(s) with the appropriate word(s).
What is the function of the phloem in plants?
a. To transport sap b. To transport nutrients c. To transport dissolved sugars d. To transport water and food e. To transport water and minerals
Humans are unable to get metabolic energy from cellulose because:
A. cellulose contains very little chemical energy. B. cellulose does not taste good. C. cellulose is present in large quantities in the gut. D. cellulose digesting enzymes are absent from the human gut. E. cellulose is not part of a normal diet.
Why do red and blue light drive photosynthesis more effectively than green light?
a. because chlorophyll cannot absorb red and blue light b. because chlorophyll can absorb green light c. because chlorophyll can absorb red and blue light d. because chlorophyll cannot absorb green light