The endosymbiont theory states that chloroplasts originated
A) by spontaneous generation in the cytoplasm of an ancestral cell.
B) by fusion of several prokaryotes.
C) from cyanobacteria entering and remaining in the cytoplasm of another cell.
D) by fusion of mitochondria and peroxisomes.
E) through evolutionary change in a mitochondrion.
Answer: C
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Recall that Archaea has three main groups. Which of the following is not one of the major archaeon groups?
A. Thaumarchaeota B. Crenarchaeota C. Euryarchaeota D. Firmicutes
Secondary growth in woody plants greatly increases the amount of ________
a. primary xylem and phloem b. vascular cambium c. epidermis d. secondary xylem and phloem
The diarrhea associated with enteropathogenic Escherichia coli (EPEC) is the result of:
A. Plasmid-mediated A/E histopathology with disruption of normal microvillus structure resulting in malabsorption and diarrhea B. Plasmid-mediated, heat-stable and/or heat-liable enterotoxins that stimulate hypersecretion of fluids and electrolytes C. Mediated by cytotoxic Shiga toxins (STx-1, STx-2), which disrupt protein synthesis. D. Plasmid-mediated invasion and destruction of epithelial cells lining colon
The t-stat, a specific instance of a test statistic, is used to evaluate a null hypothesis concerning which population parameter of a random variable?
A. The size of the sample B. The variance C. The mean D. The r-squared