Which of the following is NOT an intracellular parasite?
A) Chlamydophila
B) Coccidioides
C) Coxiella
D) Influenza virus
E) RSV
B
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Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3) molecules can form ____ with each other
A. ionic bonds B. hydrophilic bonds C. hydrogen bonds D. cohesive bonds E. covalent bonds
The F (fertility) plasmid contains a set of genes that encode for the ________ proteins that are essential in conjugative transfer of DNA
A) pili B) SOS repair C) transduction D) transformation
Why is there an upper limit to the surface area-to-volume ratio in a cell?
a. The volume of the cell maximizes the use of phospholipids. b. The surface area must be sufficient to provide adequate nutrient and waste exchange to sustain the chemical activities of the cell. c. The cells require a balance between endocytosis of precursor molecules to transporters in the membrane. d. The size of a cell is limited by the number of mitochondria. e. The organelles in cells require communication with the extracellular environment to support internal functions.
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.Australian marsupial kangaroos and placental deer graze on grass with similar teeth. These species have
A. undergone convergent evolution. B. undergone heterozygote advantage. C. developed homologous structures. D. undergone selective advantage. E. undergone divergent evolution.