In order to gain the highest resolution when looking at a cell the best type of microscopy is
A. phase-contrast light microscopy.
B. scanning electron microscopy.
C. differential-interference light microscopy.
D. confocal microscopy.
E. fluorescence microscopy.
B. scanning electron microscopy.
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Lactose induces the transcription of the lactose operon by:
a. binding to the allosteric site of the repressor after being converted to allolactose. b. stimulating lactose metabolism in the cell. c. binding to the glucose operon, making it inoperable. d. binding to the allosteric site of RNA polymerase. e. inhibiting the activity of CAP.
Ovulation occurs
A) during the middle of the proliferative phase of the menstrual cycle. B) at dawn on each day following FHS and LH release by the pituitary gland. C) during the secretory stage of the menstrual cycle. D) at the beginning of menses. E) after the formation of the corpus luteum.
The fluid-filled space that helps reduce the friction of a beating heart is called the:a
endocardium. b. pericardial cavity. c. interventricular septum. d. fossa ovalis. e. auricle.
A cell becomes arrested within the cell cycle because it is unable to replicate its DNA. In which stage would you predict the cell would become arrested?
A) Gap 1 phase B) Gap 2 phase C) mitotic phase D) S (DNA synthesis) phase E) telophase