In a hypothetical situation, a bacterium lives on the surface of a leaf, where it obtains nutrition from the leaf's nonliving, waxy covering while inhibiting the growth of other microbes that are plant pathogens
If this bacterium gains access to the inside of a leaf, however, it causes a fatal disease in the plant. Once the plant dies, the bacterium and its offspring decompose the plant. What is the correct sequence of ecological roles played by the bacterium in the situation described here?
1. nutrient recycler
2. mutualist
3. commensal
4. pathogen
5. primary producer
A) 1, 3, 4
B) 2, 3, 4
C) 2, 4, 1
D) 1, 2, 5
C
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A likely biological basis of major depressive disorder is
A) reuptake pumps for serotonin in the presynaptic neuron membrane that are overactive, depleting serotonin in the synapse. B) absent reuptake pumps for serotonin in the presynaptic neuron membrane. C) reuptake pumps for serotonin in the postsynaptic neuron membrane that do not function adequately. D) reuptake pumps for serotonin in the postsynaptic neuron membrane that are overactive, depleting serotonin in the synapse.
DNA replication involves all of the following steps except
a. separation. b. joining. c. production of single-stranded DNA molecules. d. complementary base pairing. e. polymerization.
Excretion is the process of
a) exchanging carbon dioxide for oxygen b) pumping blood throughout the body to supply nutrients and oxygen to cells c) breaking food down into nutrients that can be absorbed d) removing metabolic wastes from the body
A plant, such as an iris, that reproduces asexually most of the time probably
A) forms spores. B) is found in a changing environment. C) lacks the ability to make flowers. D) has offspring that live in the same environment as the parents. E) produces offspring that move into new environments.