Channels in membranes are best described as:

A. open spaces
B. closed spaces
C. protein plugs
D. molecule catchers
E. pores for air exchange


A. open spaces

Biology & Microbiology

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Name the two strategic methods that scientists are using to sequence genomes

What will be an ideal response?

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For a plant, carbon and nitrogen are ________.

A) macronutrients
B) micronutrients
C) minerals
D) compost

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What happens when cells cannot repair the damage caused by a mutagen?

a. the organism is not affected b. the organism is affected temporarily c. the DNA base sequence is not affected d. the DNA base sequence changes permanently

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Reduction of nitrogen-oxygen ions and compounds by some bacteria is called

A. aerobic respiration. B. denitrification. C. deamination. D. nitrification. E. fermentation.

Biology & Microbiology