What scientific evidence supports the endosymbiont hypothesis?
What will be an ideal response?
Mitochondria and chloroplasts resemble bacteria in their size and shape, and they replicate independently of the cell that holds them. Like bacteria, they have their own DNA in the form of a single circular chromosome. They also have at least two outer membranes, with the innermost membrane structurally similar to a bacterial plasma membrane. The outer membrane could have arisen during the bacterial engulfment. There are metabolic and genetic similarities between organelles and specific bacteria groups which are taken as evidence of shared ancestry.
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Which of the following is not associated with adhesive junctions?
A) desmosomes B) hemidesmosomes C) plaques D) connexin E) cadherins
Cigarette smoking damages the respiratory system by:
a. immobilizing ciliated cells b. killing white blood cells in respiratory tissue c. inhibiting mucus production d. killing white blood cells and inhibiting mucus production e. immobilizing ciliated cells and killing white blood cells
Four of the five plant groups listed below have
dominant sporophytes. Select the exception. a. bryophytes b. lycophytes c. angiosperms d. gnetophytes e. conifers
Which feature is believed to have been the first step in the evolution of land plants from the green algae?
A. evolution of vascular tissue B. evolution of seeds C. evolution of flowers in order to attract pollinators D. protection of the embryo E. evolution of microphylls