What type of vector can replicate and be maintained stably in two (or more) unrelated host organisms?
A) virus
B) expression
C) shuttle
D) integrating
Answer: C
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Which of the following statements about sister chromatids is false?
a. They arise by replication during S phase. b. They separate from each other during each mitotic anaphase. c. They usually contain identical versions of the same genetic information. d. They separate from each other during meiosis I. e. They are joined during prophase I and metaphase I at their common centromere.
Before contact with Europeans, a tiny, isolated group of South Pacific islands had a population of about 50,000 people. Because of poor management of their own resources, the population fell to around 5000 by about the year 1750. When Europeans finally
arrived, they brought smallpox, and after the ensuing epidemic, only about 800 islanders were left alive. The unusual genetic makeup of the native population is due to what phenomenon? A) speciation B) gene flow C) genetic drift D) bottleneck effect
The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because
A. red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B. the parasite damages leukocytes along with RBCs. C. RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D. complement cannot effectively destroy RBCs. E. RBCs never enter lymphoid tissue.
Why does it make sense that many fruits are green when their seeds are immature?
A) Insects, which see the color green better than mammals do, can only carry seeds when they are small (immature). B) Animals know that green fruits are tasty, and are more likely to eat them. C) Green signifies less nutritive value. D) They are green because fruits with immature seeds are still capable of photosynthesis. E) They are harder to see and thus less likely to be eaten than other fruits.