Mycoplasma is classified as a member of the Firmicutes in spite of the observation that it stains (acid-fast/Gram-positive/Gram-negative).
Fill in the blank(s) with the appropriate word(s).
Gram-negative
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The stretch reflex is
a. one of the spinal reflexes b. activated by stretch-sensitive receptors inside the muscle spindles. c. a simple, stereotyped, and repeatable motor action. d. elicited by a sensory stimulus. e. all of these.
If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
a. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV b. The drug causes mutations in the HIV, making them resistant to the drug c. The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses d. The HIV wants to avoid the drug, so it becomes resistant
Answer the following questions true (T) or false (F)
1. Lazzaro Spallanzani was the first scientist to provide evidence disproving the spontaneous generation of microorganisms. 2. The smallest chemical units of matter are elements. 3. The side groups of amino acids can interact with each other and with other molecules.
The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H. petiolaris and H. annuus because it contains a set of chromsomes from both parental species. H. anomalus is most likely an example of instantaneous speciation through
A. parthenogenesis. B. allopolyploidy. C. autopolyploidy. D. hybrid sterility.