Homologous pairs of chromosomes are separated during ________________
A. mitosis
B. meiosis I and mitosis
C. meiosis II and mitosis
D. meiosis I
E. meiosis II
D
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Four of the five structures listed below are parts of
the same sense organ. Select the exception. a. ommatidium b. retina c. crystalline cone d. photoreceptor e. lens
Which type of plant tissue is considered primarily photosynthetic?
a. vascular tissue b. dermal tissue c. ground tissue d. root tissue
In Escherichia coli, when the lac operon is fully induced (in the presence of lactose):
A. lactose cannot be cleaved to enter glycolysis. B. the lac repressor is active and transcription of the lac operon does not occur. C. lactose cannot be transported by the cells. D. the lac repressor is inactive and transcription of the lac operon does occur.
A student accidentally left a tube of nutrient broth inoculated with E. coli at 20°C for 96 hours and a tube of nutrient broth inoculated with E. coli at 37°C for 96 hours. Which tube would you expect to be in the death phase of its growth curve?
A) The tube incubated at 20°C B) The tube incubated at 37°C