Explain why “acid-fast” organisms are not usually visible when Gram stained. In other words, what biological property makes them resistant to Gram staining?
What will be an ideal response?
Some organisms have different cell wall properties that make them difficult to stain
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The dried residues of fine droplets from mucus or saliva that harbor and transmit pathogen are ________.
A. droplet nuclei B. mechanical vectors C. biological vectors D. aerosols E. fomites
Any response of a plant to the relative lengths of light and darkness is referred to as:
a. gravitropism. b. photoperiodism. c. phototropism. d. thigmotropism. e. thigmomorphogenesis.
In a population, the allele frequency for red flower color remained at 0.7 and the allele frequency for white flower remained at 0.3 for six generations. This ________ an example of a Hardy-Weinberg equilibrium in that ________.
A. is; evolution occurred B. is not; evolution occurred C. is not; evolution did not occur D. is; evolution did not occur
Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Dawn's genotype?
A. Nn B. nn C. NN D. NN or Nn