Characteristics that strongly indicate the presence of pigmented Prevotella or Porphyromonas in a clinical specimen include:
a. yellow-green fluorescence.
b. rhizoid margins resembling a "Medusa head" on anaerobic blood agar.
c. brick-red fluorescence under long-wavelength ultraviolet (UV) light.
d. chartreuse fluorescens.
C
Characteristics of anaerobes may sometimes be evident in the specimens that contain the organ-isms. Characteristics that strongly indicate the presence of anaerobes include a foul odor; sulfur granules associated with Actinomyces spp., Propionibacterium spp., or Eubacterium nodatum; and brick-red fluorescence under long-wavelength UV light associated with pigmented Prevo-tella or Porphyromonas.
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The function of the DNA polymerase is to catalyze
A) the addition of deoxynucleotides. B) the formation of RNA primers. C) the addition of ribonucleotides. D) hydrogen bonding between complementary base pairs.
9. Earthworms exhibit segmentation, defined as the
(a) division of the body into a series of similar segments. (b) presence of a true coelom. (c) difference in size of the male and female. (d) presence of a “head” equipped with sensory organs.
Which of the following it the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate d. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate e. seed coat splits ? water imbibition ? shoot cells divide and elongate ? root cells divide and elongate
If one of the n+1 gametes pictured on the previous slide developed into a sperm cell and fertilized a normal egg, which of the following is a possible outcome?
1.A triploid infant with three copies of each chromosome.
2.A mosaic tetraploid infant.
3.An infant with trisomy 8, 13, 18 or 21.
4.An autosomal monosomic infant boy.