What can you conclude from the fact that DNA analysis of all chloroplasts reveals that they are monophyletic?
A. Endosymbiosis of the same species of cyanobacteria occurred multiple times in cells that evolved into red, green, and brown algae.
B. All eukaryotic cells engulfed cyanobacteria at some point in their evolutionary history.
C. Aerobic bacteria were engulfed by eukaryotic cells, forming plant cells.
D. Cyanobacteria reproduced by sexual reproduction after being engulfed by brown algae.
Answer: A
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The tough outer covering of the eye is referred to as the
A. pupil. B. retina. C. sclera. D. fovea. E. iris.
What is the primary determinant of how far an agent travels into the respiratory tract?
a. size of the agent b. immune status of the host c. amount of mucus d. depth of breathing e category of organism
What cellular structure is unique to plant cells and some photosynthetic fungi?
a. nucleus b. vacuoles c. chloroplasts d. mitochondria e. endoplasmic reticulum
Sperm cells are moved out of the testes in the
A. seminiferous tubules. B. fallopian tubes. C. cervical canal. D. vas deferens.