This is the stage of mitosis characterized by the alignment of the chromosomes in a ring along the inner circumference of the cell:
A. interphase
B. metaphase
C. telophase
D. prophase
Answer: B
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The most common limit to plant growth is a lack of
a. phosphorous. b. carbon. c. hydrogen. d. oxygen. e. nitrogen.
Which of the following statements is correct?
a. Offspring of two different true-breeding varieties are called hybrids. b. Mendel's pea plants could cross-fertilize but not self-fertilize. c. True-breeding plants are able to produce a variety of flower colors when self-fertilized. d. A genetic cross produces the P generation.
Communities evolve to have greater biomass and species richness in a process called
A. sympatric interactions. B. adaptive modifications. C. succession. D. symbiotic relationships. E. competitive exclusion.
Efforts to define the last universal common ancestor (LUCA) currently estimate 80–500 genes are shared by all known species. The lower value of 80 was estimated by determining the number of:
A. mRNAs species produced in LUCA. B. genes coded by LUCA genome. C. genes in simplest bacterial species. D. clearly identifiable orthologs in all organisms. E. genes required for processes that are found in all organisms.