Compare and contrast the three domains identified by Woese and Fox: Eukarya, Bacteria, and Archaea
What will be an ideal response?
With respect to cell type, organisms in Eukarya have eukaryotic cells and the characteristics that go with this cell type, such as a nucleus and membranous organelles. Bacteria and Archaea both have prokaryotic cells lacking nuclei and membranous organelles. All three have different ribosomal RNA sequences found in the small subunit of their ribosomes that are characteristic for the domain, which is an important tool for categorizing organisms. All three have cell membranes; however, they differ in the lipids found in the cell membrane.
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One form of hereditary blindness is inherited through a mutation in mitochondrial genes. Which of the following is a CORRECT statement about this condition?
a) Only females can have the condition. b) Only males can have the condition. c) Males who have the condition inherited it only through their mothers. d) Males can not have the condition.
Mendel used "pure breeding" strains of peas. Which would have been easier to create, pure breeding peas with the trait caused by a dominant allele or a recessive allele?
Comments: Remember, in the process of creating a pure breeding strain, you would mate peas with identical phenotypes. The issue here hinges on which phenotype is more likely to have a mixed genotype, one caused by dominant or recessive alleles. A. dominant allele B. recessive allele C. Both strains would be equally easy to create.
All of the following are components of the mammalian host immune system EXCEPT ________.
A. phagocytes. B. antibodies. C. antigens. D. leukocytes.
In a vertebrate with a four-chambered heart, the structure(s) containing blood with the highest O2 concentration is/are the _______________.
A. pulmonary arteries B. pulmonary veins C. right atrium D. inferior vena cava E. right ventricle