The ________ of the glomeromycetes do not penetrate host root cells; instead, the fungal hyphae grow between and around cells.
A. ectomycorrhizal hyphae
B. stolon hyphae
C. progametangia hyphae
D. arbuscular mycorrhizal hyphae
Answer: D
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Resistance of some animals to certain viral diseases is based on
A. lack of spikes for attachment. B. phagocytosis of the virus by the host cell. C. the presence of the viral envelope. D. lack of specific receptors on the host cell.
Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) All of these are correct.
A(n)___________ is defined as a heritable change in the genetic material.
Fill in the blank(s) with the appropriate word(s).
In seed plants, the microspores become ___.
A. ovules B. seeds C. pollen grains D. cones E. sperm cells