The letters G, Q, R, and C, used to describe the appearance of chromosomes, refer to the ____
a. position of the bands
b. staining procedure used to reveal the bands
c. number of arms per chromosome
d. number of centromeres per chromosome
e. position of the centromeres
b
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You need to determine if a pure culture of bacteria is gram-positive or gram-negative, but you've just spilled your only solution of crystal violet so you can't do a Gram stain. You decide to try a lysozyme treatment on a sample of each culture and then examine the samples under the microscope. The expected result is
A. gram-positives will lyse and appears as debris; gram-negatives will lose cellular morphology and appear as cocci. B. gram-negatives will lyse and appears as debris; gram-positives will be unaffected. C. gram-negatives will lyse and appears as debris; gram-positives will lose cellular morphology and appear as cocci. D. gram-positives will lyse and appears as debris; gram-negatives will lyse but more slowly. E. gram-positives will lyse and appears as debris; gram-negatives will be unaffected.
Exposed plant tissues are covered by ________ tissue
a. ground b. shoot c. dermal d. vascular
Until the late 1970s, there was no "Domain" as the broadest category in taxonomy. Instead, there were five kingdoms: Protista, Plantae, Fungi, Animalia, and Monera, which included all bacteria-like organisms. Researchers proposed the domains to distinguish between the bacteria-like organisms. Which information supported the domain level, and subsequent domains of Bacteria, Archaea, and Eukarya?
A. More complex emergent properties developed after organisms were originally categorized into kingdoms. B. Organisms in the Bacteria and Archaea domains have a nucleus, whereas eukaryotes do not. C. Cell shapes of bacteria and archaea were found to be more distinct, after microscope technology improved. D. Differences in DNA among the existing kingdoms showed a need for a broader naming category. E. Evolution led to new adaptations and diversity of organisms.
Which classification level contains the greatest number of species?
a. class b. order c. family d. domain e. phylum