Liverworts are the most primitive group of non-vascular plants.
a. Conifers
b. Ginkophytes
c. Cycads
d. Gnetophytes
a. Conifers
Conifers have the most variety of species of the gymnosperms. Most are tall trees that usually bear scale-like or needle-like leaves, and they are specially adapted to live in cold, dry climates.
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B-cell receptors on B cells are ____
a. IgG molecules only b. IgE molecules only c. IgD or IgE molecules d. IgM or IgD molecules e. IgM molecules only
Intermediate filaments function in
a. cell motility. b. providing mechanical strength for cells. c. nuclear pore structure. d. All of the above e. None of the above
The site on a chromosome where microtubules attach during cell division is the
A) chromatid. B) centromere. C) histone. D) telomere. E) locus.
The process of conversion of ammonia to nitrate is referred to as ________.
A. nitrogen fixation B. denitrification C. nitrification D. ammonification