The structures present in the hay infusions used in experiments on spontaneous generation that made them difficult to sterilize are
A. chlorophyll.
B. toxins.
C. organelles.
D. endospores.
D
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By nature of its infectivity, M13 phage can be used in the laboratory to continually propagate a particular DNA sequence inside of Escherichia coli by simply culturing infected E. coli in LB
Indicate whether the statement is true or false.
Nearly ALL cases of acute listeriosis require hospitalization
Indicate whether the statement is true or false.
Which mechanism(s) increase(s) genetic diversity?
a. crossing-over between chromosomes during meiosis only b. independent assortment of chromosomes during meiosis only c. random DNA mutations only d. crossing-over between chromosomes and independent assortment of chromosomes during meiosis only e. crossing-over between chromosomes, independent assortment of chromosomes during meiosis, and random DNA mutations
Hair color (or lack of it) is mostly due to:
A) sweat gland pigments. B) sebaceous gland pigments. C) activity of melanocytes. D) a colored version of keratin.