Bacteria methylate their DNA in order to:
a. prepare for DNA replication.
b. prepare for mitosis.
c. effectively infect other cells.
d. protect it from restriction enzymes.
e. prevent viral DNA from hybridizing with bacterial DNA.
d
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The major advantage of immunofluorescent microscopy assays is that:
a. extensive training is not necessary. b. it serves as an excellent way to preserve the reaction for referral and archiving. c. visual assessment of the adequacy of a specimen is possible. d. fluorescent microscopes are easily ac-cessible to most laboratories.
Guttation results from:a
water pressure. b. transpiration pull. c. osmotic pressure. d. root pressure. e. sink-to-source transport
Which one of the following does not match a component of the amniotic egg with its primary function?
A. Shell-porous, protective covering B. Yolk sac-provides food for the embryo C. Allantois-segregates nitrogenous wastes from embryo D. Chorion-exchange of respiratory gases; retention of water E. Amnion-encloses embryo within an oxygen-filled cavity
Of the major groups of fungi that are recognized by most mycologists, which includes the fungi with which most plants form mycorrhizae?
a. Chytrids b. Zygomycetes c. Glomeromycetes d. Ascomycetes e. Basidiomycetes