Which of the following is an adaptation that enhances the uptake of water and minerals by roots?
A) mycorrhizae
B) cavitation
C) active uptake by vessel elements
D) rhythmic contractions by cortical cells
E) pumping through plasmodesmata
Ans: A) mycorrhizae
Biology & Microbiology
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In conifers, microspores develop into
A. flagellated sperm. B. pollen grains. C. ovules. D. a nucellus. E. male cones.
Biology & Microbiology
All cells in an embryo have the same genes, but they express different subsets of this genome. Selective gene expression is the basis of:
a. cleavage b. cell differentiation c. fertilization d. gamete formation e. organ maturation
Biology & Microbiology
At what point in the figure above is the urine most
concentrated? a. A b. B c. C d. D e. none of these
Biology & Microbiology
The only part of an amino acid that differs from other amino acids is its R group.
Answer the following statement true (T) or false (F)
Biology & Microbiology