How did mitochondria and chloroplasts arise in eukaryotic cells?
A) Via endosymbiosis, where mitochondria and chloroplasts were independent prokaryotic organisms that were engulfed by a larger cell
B) Via binary fission, where bacteria divided to create mitochondria and chloroplasts
C) Via the endomembrane system that engulfed mitochondria and chloroplasts
D) Via the endomembrane system that enfolded in such a way as to create mitochondria and chloroplasts
A
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Transcriptional regulation in prokaryotes is rapidly turned on or off in response to environmental changes and involves both positive and negative regulators
A. true B. false
The low molecular weight protein produced by animal cells in response to viral infections is
A. complement. B. lysozyme. C. histamine. D. interferon.
In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of chromatids present
per cell in prophase II after the first division and cytokinesis?
a. 0 b. 6 c. 12 d. 24 e. 48
Nondisjunction of chromosomes resulting in aneuploidy occurs during
A. prophase I. B. anaphase I or II. C. metaphase II. D. anaphase of mitosis. E. telophase I.