The total of all the resources, both biotic and abiotic, that a species exploits for its survival, growth, and reproduction is its
A. competitive zone.
B. habitat.
C. food web.
D. niche.
E. biosphere.
Answer: D. niche.
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Long terminal repeats (LTRs) are:
A. a class of transposable elements that replicate and transpose via DNA replication and repair. B. a class of transposable elements that uses RNA as an intermediate. C. a class of transposable elements that uses DNA as an intermediate. D. a class of transposable elements that uses protein as an intermediate. E. a class of transposable elements that uses ribosomes as an intermediate.
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
An electron microscope must use electromagnet 'lenses'shaped like donuts to direct the electrons onto the specimen. Why aren't they solid, like the lenses in a light microscope?
A. A magnetic field cannot be applied across a completely solid object-there must be an opening within the object for the field to be applied through. B. The user has to be able to physically look through the magnets to focus the beam of electrons onto the specimen, since the metal of the magnets is opaque. Without a hole in the middle, the user wouldn't be able to see! C. The electrons would destroy the electromagnet material unless there was a physical hole for them to travel through on their way to the specimen. D. Electrons are particles, and particles cannot travel through a solid item. The hole in the middle allows them to travel from the source of the electrons to the specimen.
Which of the following statements about sexually transmitted diseases is true?
a. Nearly all STDs have severe and obvious ongoing symptoms. b. STDs are annoying and uncomfortable but they are never fatal. c. STDs can be transmitted through the mouth or the anus.