Antelope and kangaroos are both herbivores that feed on grasses and brush. What would you expect to happen if someone set up a game farm and released both species into the same grassy plain?
What will be an ideal response?
Because both species eat the same foods, the competitive exclusion principle says that they cannot occupy the same niche in the community. One of two things will have to happen: One species will outcompete the other, leading to a reduction in its numbers and possible extinction from the habitat, or resource partitioning will occur, with each species limiting itself to a separate subgroup of plants in the ecosystem.
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Hydrogenation is a chemical process that ____
a. turns liquid oil to solid fats b. turns amino acids into proteins c. turns DNA into lipids d. creates stable alternative energy sources e. creates unstable alternative energy sources
Which of the following best describes siRNA?
A) a double-stranded RNA, one of whose strands can complement and inactivate a sequence of mRNA B) a single-stranded RNA that can, where it has internal complementary base pairs, fold into cloverleaf patterns C) a double-stranded RNA that is formed by cleavage of hairpin loops in a larger precursor D) a portion of rRNA that allows it to bind to several ribosomal proteins in forming large or small subunits
What happens during the follicular phase of the ovarian cycle?
A. Structures in the ovary produce estrogen B. Structures in the ovary produce progesterone C. FSH and LH are present D. Eggs are developing E. One or more eggs has been released and will implant in the uterus if fertilization has occurred
Gel electrophoresis separates DNA fragments on the basis of differences in their A:C ratio.
a. true b. false