In which of the following microscopes are
specimens coated with a thin layer of metal?
a. Transmission electron microscopes
b. Scanning electron microscopes
c. Fluorescence microscopes
d. Phase-contrast microscopes
e. Compound microscopes
B
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Terminal electron acceptors used by Desulfotomaculum include sulfate and sulfite, converted to hydrogen sulfide.
Answer the following statement true (T) or false (F)
The mature male gametophyte is produced
A. in the anther. B. within the pollen granule during transfer. C. when the pollen makes contact with the stigma. D. in the pollen tube when the generative cell divides. E. within the ovule just prior to fertilization.
Emergent properties are ____
a. characteristics of atoms but not molecules b. characteristics that depend on the level of organization of matter but do not exist at lower levels of organization c. characteristics of nonliving matter that depend on the level of organization d. dependent on higher levels of organization of living and nonliving matter e. characteristics of all multicellular organisms but not unicellular organisms
Which of the following classes of amino acids is buried within the folded structure of the protein?
a. Acidic b. Basic c. Nonpolar d. Polar