You discover a fungus that contains a strange star-shaped organelle not found in any other eukaryotic cell you have seen. On further investigation, you find the following
1. The organelle possesses a small genome in its interior.
2. The organelle is surrounded by two membranes.
3. Vesicles do not pinch off from the organelle membrane.
4. The interior of the organelle contains proteins similar to those of many bacteria.
5. The interior of the organelle contains ribosomes.
How might this organelle have arisen?
A genome, a double membrane, ribosomes, and proteins similar to those found in bacteria are evidence for an organelle having evolved from an engulfed bacterium.
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A modified form of cellulose found in the exoskeletons of insects and crustaceans is known as:
A. chitin B. starch C. amylose D. glycogen
If species are competing for the same resource, one species is likely to go extinct through competitive exclusion, or natural selection will drive the evolution of
A. prezygotic isolating mechanisms. B. hybrids. C. character displacement. D. polyploid individuals.
Which hormone has a role in both feelings of well-being and in social stress responses in both sexes?
a. oxytocin b. endorphins c. insulin-like growth factors d. epinephrine e. norepinephrine
What kind of bacteria is used to monitor coastal water quality?
a. Cyanobacteria b. Chemosynthetic bacteria c. All of these choices d. Coliform bacteria