When it is important to count the number of cells, determine cell size and differentiate between dead and live cells a ________ is used.
A. plate count
B. SEM
C. flow cytometer
D. methylene dye indicator
E. Coulter counter
Answer: C
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________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.
A. Induction B. Attenuation C. Catabolite repression D. All of the choices are correct.
Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species. B. continental drift. C. changes in geological periods. D. interaction of genetic changes and environmental changes. E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.
If black fur is produced by a recessive allele, which genotype is most likely to produce a black individual?
A. Bb B. Cb C. bb D. BB
Which organisms reproduce both sexually and asexually?
a. plants and fungi b. animals only c. plants only d. plants and animals