Which of the following statements best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?
a. Habitats are limited to the upper respira-tory tract of various mammals.
b. Habitats are limited to the gastrointestinal tract.
c. Habitats are mostly soil and water envi-ronment.
d. Habitats are limited mostly to soil.
C
The epidemiologic patterns of Vibrio spp., Aeromonas spp., P. shigelloides, and C. violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and freshwater for Aeromonas spp., P. shigelloides, and C. violaceum.
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Given that an individual is a compound heterozygote at the CFTR locus, the gene that causes cystic fibrosis, what can be inferred?
A) If the individual has children, all the children will have cystic fibrosis. B) At least one of the individual's parents had cystic fibrosis. C) The individual is a carrier for cystic fibrosis, but does not have the disease. D) A drug that effectively treats one allele may not treat the other.
Chloroplasts and mitochondria share something with the nucleus that the other organelles do not. What is this shared characteristic?
A) They are the only organelles wrapped in a lipid-based membrane. B) They are the only organelles that produce ATP. C) They are the only organelles that contain DNA. D) They are the only organelles not found in bacteria.
Which of the following is the correct order for the four main stages of mitosis?
A. prophase, anaphase, metaphase, telophase B. metaphase, telophase, prophase, anaphase C. prophase, metaphase, anaphase, telophase D. anaphase, prophase, metaphase, telophase
The evolutionary innovation that first appeared in arthropods and is characteristic of the most successful of all animal groups is that of
A. bilateral symmetry. B. three primary types of tissues. C. coelomic body architecture. D. segmentation. E. jointed appendages.