This type of selection favors both extremes of the phenotype spectrum within a population
a. directional
b. stabilizing
c. disruptive
d. natural
e. neutral
C
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Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO2 but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. H. influenzae. c. H. aphrophilus. d. H. ducreyi.
In 1909, Charles Walcott discovered fossils in the Burgess Shale of the Canadian Rockies. The area was formed by an underwater mudslide that provided an oxygen free environment, so decomposition was minimal. Why was this site particularly important to the fossil record?
A. It contained fossils from the Cambrian period. B. It contained both vertebrate and invertebrate fossils. C. It contained fossils of well preserved soft tissues of invertebrates. D. It showed that mudslides could occur underwater. E. The first bird fossil, Archaeopteryx, was found here.
How many membranes surround each chloroplast?
A) 1 B) 2 C) 3 D) 4
Draw one eukaryotic chromosome as it would appear during interphase, during each of the stages of mitosis, and during cytokinesis. Also draw and label the nuclear envelope and any microtubules attached to the chromosome(s).