The theory that chloroplasts and mitochondria had their evolutionary beginnings in eukaryotic cells as endosymbionts is supported by all of the following EXCEPT:
a. chloroplasts and mitochondria are completely autonomous within eukaryotic cells.
b. chloroplasts and mitochondria have DNA.
c. chloroplasts and mitochondria have small ribosomes for protein synthesis.
d. chloroplasts and mitochondria are approximately the same size as prokaryotic cells.
e. chloroplasts and mitochondria have the same shape as prokaryotic cells.
A
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The bacterial flagellum has three components. In order from the cytoplasm to the external environment, they are ________.
A. basal body, hook, and filament B. basal body, filament, and hook C. filament, hook, and basal body D. filament, basal body, and hook E. hook, basal body, and filament
A result is statistically significant if
a. it is unlikely to have occurred by chance. b. it is likely to have occurred by chance. c. it is likely to have occurred in 50% of the cases. d. it is consistent with predictions. e. it is widely accepted.
Which of the following is a phase of the
menstrual cycle? a. follicular phase b. luteal phase c. ovulation d. all of these e. none of these
Which of the following is most like the formation of identical twins?
A) cell cloning B) therapeutic cloning C) use of adult stem cells D) organismal cloning