When aerosols containing pathogens spread disease from a distance of less than one meter, it is considered
A) vector transmission.
B) waterborne transmission.
C) contact transmission.
D) airborne transmission.
Ans: C) contact transmission.
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Assume that a plasmid (circular) is 3200 base pairs in length and has restriction sites at the following locations: 400, 700, 1400, 2600. Give the expected sizes of the restriction fragments following complete digestion
A) 700, 400, 1400, 2600 B) 300, 700, 1000, 1200 C) 400, 800, 1000 (2 of these) D) 300, 700, 2200 E) 400, 1200, 1600
Parenchyma and pith are cells derived from
a. meristem tissue b. ground tissue c. vascular cambium tissue d. cork cambium tissue e. epidermal tissue
Reproductive methods among the ________ are the most advanced of any fish.
A. Osteichthyes (bony fish) B. Placodermi (armored fish) C. Acanthodii (spiny fish) D. Chondrichthyes (sharks)
Evolution does not violate the second law of thermodynamics because
A. living organisms are not subject to the second law. B. Earth is not a closed system; it constantly receives an input of energy from the sun. C. evolution is a random process; it does not require an input of energy. D. the disorder generated by extinction balances the order created by evolution.