Which of the following statements is not true of homologous chromosomes?
1.They contain the same genes at the same loci.
2.They contain the same alleles at the same loci.
3.Typically, one is paternal and one is maternal.
4.They may exchange portions during meiosis.
2
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Why do histones bind tightly to DNA?
A) Histones are positively charged, and DNA is negatively charged. B) Histones are negatively charged, and DNA is positively charged. C) Both histones and DNA are strongly hydrophobic. D) Histones are covalently linked to the DNA. E) Histones are highly hydrophobic, and DNA is hydrophilic.
Akinetes and hormogonia are specialized cells, found in some cyanobacteria, that facilitate nitrogen fixation
Indicate whether the statement is true or false.
All aerobic bacterial species have identical electron acceptors in their electron transport systems.
Answer the following statement true (T) or false (F)
Flatworms are most closely related to the ________
A) cnidarians B) annelids C) echinoderms D) arthropods