How is diabetes linked with homeostasis?
A) Diabetes results from the body having a positive-feedback response to the level of glucose in the blood.
B) Diabetes results from the body responding too strongly to the level of glucose in the blood.
C) Diabetes results from the body not responding with a negative feedback to the level of glucose in the blood.
D) Diabetes is not linked with homeostasis.
C
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Ring species such as the greenish warbler complicate the biological species concept because (select all correct choices)
A. at least some of their populations are reproductively isolated from one another but can still exchange genetic material. B. at least some of their populations overlap spatially, but individuals in those populations do not interbreed with one another. C. individuals in at least some populations interbreed with individuals from other species. D. ring species comprise populations that are in the process of allopatric speciation. E. none of these
Which of the following is not true about the cut-and-paste pathway of transposition?
A. The reaction forms covalent intermediates as did recombinases of site-specific recombination. B. At the target site, the insertion sites on each strand are staggered to create short repeated sequences at each end of the inserted transposon. C. Cut-and-paste transposition leaves double-stranded breaks at the donor site that can be repaired by recombination repair. D. The transposases molecules bound to either end of the transposon come together before cutting at the 3' ends of the transposon. E. The 3' ends generated by transposase now attack the 5' ends of the transposon, forming hairpins at the ends of the transposon as it is released from the DNA.
Which part of the T2 bacteriophage entered E. coli cells in the experiment which confirmed the identity of the transforming principle?
A) The RNA B) The DNA C) The whole virus D) The protein coat E) No part
The population size that a particular habitat can support indefinitely is called the
a) carrying capacity b) intrinsic population size c) cohort d) realized niche e) survivorship curve