A salamander is a vertebrate that spends part of its life cycle in water (juvenile stage) and part on land (adult stage). In both life stages, the salamander's body temperature depends on its surrounding environment, so the salamander demonstrates
________ behavior.
A) endothermic
B) ectothermic
C) huddling
D) regulatory
Answer: B
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An Hfr strain of E. coli with the genotype a+b+c+d+e+f+ is mated with an F- auxotrophic strain with the genotype a-b-c-d-e-f-. Conjugation is stopped at 10-minute intervals and the genotypes of the resulting conjugants are determined
The following results are obtained: After 10 minutes e+ After 20 minutes a+e+ After 30 minutes a+b+e+ After 40 minutes a+b+d+e+ After 50 minutes a+b+c+d+e+ After 60 minutes a+b+c+d+e+f+ What is the correct order of genes on this bacterial chromosome?
One type of habitat loss is particularly destructive. This habitat is known for being especially species-rich, full of oxygen-generating trees, plus many plants that might provide genetic variability for crop plants or secondary metabolites with pharmaceutical properties. Which habitat?
A. Tundra B. Coniferous forest C. Temperate forest D. Desert E. Tropical rainforest F. Chaparral G. Savannah H. Coral reef
Polypeptides can have which of the following types of effects?
I) autocrine II) paracrine III) endocrine A) only I and III B) only II and III C) only I and II D) I, II, and III
The existence of of a particular locus can only be inferred if there are no allelic variants at that locus
__________________ Indicate whether the statement is true or false.