The interaction of several polypeptide chains in a
hemoglobin molecule is its __________ structure.
a. primary
b. secondary
c. tertiary
d. quaternary
e. combined
Answer: d
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Which type of lifestyle is demonstrated by bacteria in biofilms?
A. Sessile B. Photoautotrophic C. Planktonic D. Parasitic
Engineering a metabolic pathway enables a researcher to use different genes from unrelated organisms
Indicate whether the statement is true or false.
Blood cultures are collected from a 36-year-old patient suspected of having a disseminated fungal infection. History reveals that she was exposed to bird droppings and may have inhaled the conidia. What is the best blood culture system to use to ensure optimal recovery of this pa-thogen?
a. BACTEC b. BacT/ALERT c. ESP system d. Isolator system
What are the two major forces contributing to allopatric speciation?
a. genetic drift and mutation b. natural selection and migration c. mutation and natural selection d. natural selection and genetic drift e. nonrandom mating and migration