Answer the following questions true (T) or false (F)
1. Photoheterotrophs use carbon dioxide as their sole carbon source.
2. Atmospheric nitrogen gas (N2 ) is produced in the process known as nitrogen fixation.
3. Thermoduric mesophiles are often responsible for spoilage of improperly canned foods.
1. FALSE
2. FALSE
3. TRUE
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Answer the following statements true (T) or false (F)
1. A bacterial infection such as pneumonia is most likely caused by organisms derived from the animal kingdom. 2. All genetic mutations are harmful to an organism. 3. Vertical evolution, whereby living organisms evolve from a common ancestor ("tree of life"), is the only mechanism of evolution on Earth. 4. The effects of a genetic mutation are always limited to simply a change in DNA sequence with little consequence on the proteins expressed. 5. The proteome, rather than genome, is most directly responsible for the structure, function, and appearance of organisms.
When a neuron is at rest, ____
a. the sodium and potassium gated channels are closed b. the sodium gated channels are closed and the potassium gated channels are open c. the sodium gated channels are open and the potassium gated channels are closed d. the sodium and potassium gated channels are open e. the sodium and potassium gated channels may be open or closed depending upon their location in the nervous system
The major cause of male infertility is ________________
A. varicocele D. semen disorders B. undescended testicles E. obstructions C. testicular failure
If a bacterial cell is placed into a hypertonic solution, then
A) Water will move into the cell and the cell will shrink B) Water will move into the cell and the cell will expand C) Water will move out of the cell and the cell will shrink D) Water will move out of the cell and cell will lyse