The prevalance of iron-sulfide cofactors in organisms supports the hypothesis that life arose _____
a. in outer space
b. on tidal flats
c. near deep-sea vents
d. in the upper atmosphere
C
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Answer the following statements true (T) or false (F)
1. Plants are unable to use nitrogen gas directly. 2. Nitrate reductase is an enzyme that changes nitrogen gas into nitrate. 3. When stomata are closed plants CANNOT absorb CO2, therefore photosynthesis is limited. 4. Nitrogen is especially important in plants for the formation of proteins. 5. Certain fungi help make available minerals such as nitrogen.
Evidence suggests that the ________ evolved from an ancient prokaryote whose plasma membrane was infolded
a. endoplasmic reticulum and nuclear envelope b. mitochondrion c. ribosome d. chloroplast
Characterize the stamen of a flower
What will be an ideal response?
Semisynthetic drugs developed to combat resistance are often called (analog/second generation/synergist) drugs.
Fill in the blank(s) with the appropriate word(s).