Which microscope is used to observe viruses and the internal structure of thinly sectioned cells?
A) transmission electron microscope
B) darkfield microscope
C) fluorescence microscope
D) brightfield microscope
E) scanning electron microscope
A
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Although most metabolic reactions are freely reversible, a few irreversible catabolic steps are bypassed during biosynthesis with special enzymes that catalyze the reverse reaction in order to allow for independent regulation of catabolic and anabolic pathways.
Answer the following statement true (T) or false (F)
The mature male gametophyte is produced
A. in the pollen tube when the generative cell divides. B. within the pollen granule during transfer. C. within the ovule just prior to fertilization. D. in the anther. E. when the pollen makes contact with the stigma.
The nucleus is surrounded by a membrane. This membrane has pores that enable the nucleus to carry out one of its functions. What do these pores allow to happen?
A) nutrients that are stored in the nucleus to enter the cytoplasm B) genetic information to pass from the nucleus to the cytoplasm C) waste substances to enter the nucleus D) proteins that are made in the nucleus to pass into the cytoplasm
The asexual spores of molds are classified according to their
A) size. B) type of metabolism. C) number of chromosomes. D) shapes. E) mode of development.