Some vitamins may be beneficial as antioxidants by protecting cells against free radical damage.
a. true
b. false
a. true
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The ____ and ____ of rivers are key determinants of their physical habitats
a. flow rate; volume b. size; shape c. flow rate; temperature d. location; volume e. biodiversity; species richness
In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a diploid zygote; the other fuses
with the endosperm mother cell, forming a triploid cell. Fill in the blank(s) with the appropriate word(s).
Although Gregor Mendel knew nothing of chromosomes, mitosis, or meiosis, we now know that his Principle of Segregation corresponds to the events of _____
1.meiosis I 2.meiosis II 3.mitosis 4.both meiosis and mitosis 5.neither meiosis nor mitosis
What connects the cytoplasm of adjacent cells in plants?
a. the plasma membrane b. plasmodesmata c. the primary cell wall d. the secondary cell wall