A trait that is physically expressed by one of two distinct possible outcomes is ________.
a. recessive
b. monotonous
c. dominant
d. phenotype
d. dichotomous
Answer: d. dichotomous
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Members of the Euglenozoa move within their habitats with the aid of
A. tests. B. pseudopodia. C. cilia. D. flagella. E. pellicles.
Which X-linked trait is caused by a dominant mutant allele?
a. hemophilia A b. Duchenne muscular dystrophy c. red-green color blindness d. amelogenesis imperfecta e. testicular feminizing syndrome
The structural formula for any molecule is only of limited value because _____.
A) it can't show the total number of atoms present within the molecule B) it is unable to indicate whether a molecule is an acid or base C) it can't convey any information about the three-dimensional aspects of the molecule D) computers are necessary to handle the information needed for a structural representation E) molecules change continuously and must be represented by computerized animation to be useful
Which of the following groups is incorrectly described?
a. Cyanobacteria—photosynthetic filaments of cells; many species use the pigment bacteriorhodopsin and inhabit very saline waters b. Proteobacteria—diverse gram-negative bacteria, including pathogens such as Salmonella and Helicobacter pylori and beneficial species such as Rhizobium c. Chlamydias—intracellular parasites, including a species that causes blindness and nongonococcal urethritis d. Spirochetes—helical heterotrophs, including pathogens that cause syphilis and Lyme disease e. Gram-positive bacteria—diverse group that includes actinomycetes, mycoplasmas, and pathogens that cause anthrax, botulism, and tuberculosis