Koch's postulates set forth a set of criteria designed to establish a causal relationship between a causative microbe and a disease
a. true
b. false
a. true
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Jerry is six years old. His sister Hanah has the autosomal recessive condition neuronal ceroid lipofuscinosis that affects learning and coordination. Their parents are healthy. Given that Jerry has a normal phenotype and is not affected by the disorder, the probability that Jerry is a homozygote for the wild type allele of the gene that causes the condition is
A) 1/8. B) 1/4. C) 1/3. D) 2/3.
The most common metabolic waste product is ____
a. urea b. carbon dioxide c. ammonia d. oxygen e. electrolytes
Which cells secrete surfactant?
A) alveolar macrophages B) goblet cells C) type II alveolar cells D) ciliated cells E) type I alveolar cells
Key sequences exist within promoters, which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position. These representations are called ________ sequences.
A. common B. idealized C. consensus D. convergence