Embryonic Stem cells are _____.
a) pleiotrophic
b) oncogenetic
c) totipotent
d) pluriptent
Ans: c) totipotent
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The microtubules making up the mitotic spindle attach to specialized structures called ____ that are found in the centromere region of the chromosome.
a. nucleosomes b. centrosomes c. kinetochores d. chromatids e. centrioles
Males that tend to be taller than average and show mild mental impairment may have
A. XXY chromosomes. B. XYY chromosomes. C. Turner syndrome. D. Down syndrome. E. Klinefelter syndrome.
Which of the following environmental conditions is likely to enhance photorespiration?
A. a ratio of CO2 to O2 that favors CO2 B. conditions that cause the stomata to open C. plants growing far apart D. a hot, dry environment E. darkness