What type of microscopy allowed scientists to visualize the cytoskeleton in living cells?
A) transmission electron microscopy
B) scanning electron microscopy
C) fluorescence microscopy
D) light microscopy
Answer: C
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Allolactose, an isomer of lactose, is formed in small amounts from lactose. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when lactose enters
the cell? A) The repressor protein attaches to the regulator. B) Allolactose binds to the repressor protein. C) Allolactose binds to the regulator gene. D) The repressor protein and allolactose bind to RNA polymerase. E) RNA polymerase attaches to the regulator.
The number of colonies obtained in a plate count does NOT depend on the
A) inoculum volume. B) size of the colonies. C) type of culture medium. D) incubation time.
Which of the following is NOT an endocrine gland?
A) pituitary B) thyroid C) adenoid D) adrenal
The carotenoids and other accessory pigments in the chloroplast help capture light into the reaction center's chlorophyll molecules
Indicate whether the statement is true or false