Which yellow-pigmented organism exhibits gliding motility that grows best at 35°C and in conditions with increased carbon dioxide (CO2) but cannot grow in ambient air?
a. Actinobacillus
b. Capnocytophaga
c. Cardiobacterium
d. Kingella
B
Capnocytophaga spp. can be identified with the isolation of a yellow-pigmented, thin, gram-negative rod with tapered ends that exhibits gliding motility and does not grow in ambient air.
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Which of the following was observed by Erwin Chargaff?
A. Base composition of DNA does not vary from one species to another. B. The DNA isolated from different tissues of the same species all have the same base composition. C. Base composition changes as the organism ages. D. In all species, the number of adenines equals the number of guanines. E. In all species, A + T = G + C.
In 1910, Charles Davenport opened the Eugenics Record Office at Cold Spring Harbor. He believed "feeblemindedness" was
A) not inherited. B) a result of the influence of many genes. C) caused by the environment. D) the result of a single gene.
Using the characteristics that define life, compare and contrast a plant, a bacterium, and a salt crystal. What will be an ideal response?
Many seedless plants produce spores of one morphological type, which is referred to as:
a. heterospory. b. sporogeny. c. megaspory. d. homospory. e. microspory.