The parts of the plant that conduct water and dissolved minerals from the roots to the leaves are
A. xylem.
B. stomata.
C. roots.
D. phloem.
E. cuticle.
Answer: A. xylem.
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When a species produces gametes of different sizes (select all correct choices):
A. the smaller are designated as male and are called sperm, or spermatozoa. B. the larger are designated as female and are called eggs, or ova. C. the smaller are designated as female and are called eggs, or ova. D. the larger are designated as male and are called sperm, or spermatozoa. E. None of these choices are correct.
Rhizobium and Bradyrhizobium are significant contributors to which process when engaged in a symbiotic relationship with leguminous plants?
A. Sulfate reduction B. Denitrification C. Nitrification D. Nitrogen fixation
The ends of linear chromosomes that maintain chromosome integrity are called
A. kinetochores B. kinetin C. thymine dimers D. telomeres E. the replisome
The only protozoan that causes an STI that affects mostly women is
a) Trichomonas vaginalis. b) Gardnerella vaginalis. c) Mycoplasma hominis. d) Haemophilus ducreyi.