A chemical that comes from outside the ecosystem is referred to as a(n) ________ chemical
A) synthropic
B) lithotrophic
C) allochthonous
D) pleomorphic
Answer: C
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A cell infected by viruses may die due to the actions of interferons. The same result would occur WITHOUT interferon-any cell infected by a virus would die directly from the virus
Is there any apparent benefit to the host organism from the interferon action? A. No-interferon is just an evolutionary leftover from a much earlier form of antiviral activity. It has no function now. B. Yes-when the interferon acts on a virally infected cell, it shuts down protein production (which shuts down virus replication). Without interferon, virus will kill the cell eventually, but only after it has replicated many times over. Interferons may kill the host cell, but they will also prevent it from being used to replicate virus. C. Yes-by killing host cells, you limit the number of cells that are available targets for viral infection. This is a good way of preventing viral infection. D. No-viruses will replicate in cells regardless of the effects of interferons, so their action of killing the cell has no benefit to the host organism during the infection process.
Exoskeletons are most characteristic of
a. Mollusca b. Arthropoda c. Nematoda d. Chordata e. Annelida
You have been assigned to conduct a scientific study on the effects of four types of fertilizer on broccoli growth. You visit several broccoli farms to make observations and use these observations to find preliminary correlations and form hypotheses. To test your hypotheses, you set up five plots of broccoli-one plot for each fertilizer type plus a control plot, which is not fertilized. When you meet with your professor to discuss your progress, he tells you that your project is missing an important component of the scientific method. What is missing?
A. Testing the fertilizer in a natural setting on wild relatives of broccoli B. Setting up plots that receive more than one type of fertilizer C. Testing biotic factors such as herbivore abundance D. Using more than one plant species so your conclusions can be more broadly applied E. Replicating each fertilizer treatment in multiple plots
Pickling is an effective means of food preservation involving
A) increasing oxygen content. B) increasing salt concentration. C) reducing pH. D) reducing oxygen content. E) increasing salt concentration or reducing pH or both.