Which of the following statements about plant tissue culture is false?
A. Individual cells can give rise to whole plants through tissue cultures.
B. Synthetic hormones can be used to selectively promote root or shoot formation.
C. A callus is a mass of undifferentiated cells.
D. Virus-free crop species can be propagated by culturing meristems.
E. Callus tissue can only form roots, not shoots.
Answer: E
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Plants are dependent upon animals for:
A. pollination. B. seed dispersion. C. respiration. D. pollination and seed dispersion. E. pollination, seed dispersion, and respiration.
Ultraviolet (UV) light-treated bacteria would have increased DNA damage in the form of
A) analog incorporation. B) pyrimidine dimer formation. C) intercalation of the bases. D) direct transition of the bases. E) deamination.
Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexAn area with many endemic species, some of which are disappearing.
Fill in the blank(s) with the appropriate word(s).
Isotype switching occurs when
A) an antibody changes which class it is. B) an antibody changes epitope it can recognize. C) a B cell changes which antibody class it is producing. D) a B cell switches which epitope it recognizes. E) activated B cells differentiate into either plasma or memory cells.