Which of the following sources can allow pollutants to enter water supplies?
a) all of the other choices
b) oil spilled by a tanker accident
c) grease and oil washed off streets by rain
d) chemicals released into the air by factories
Ans: a) all of the other choices
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Which list represents the correct order of structures from outside to inside in the stem of a vascular plant?
a. stele, cortex, epidermis, pith b. epidermis, pith, cortex, stele c. cortex, stele, pith, epidermis d. epidermis, cortex, stele, pith e. stele, epidermis, pith, cortex
The nuclear membrane re-forms during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Food is usually contaminated by which of the following sources?
a. aerosols b. mechanical vector c. soil d. handler e. biological vector
The first codon to be deciphered was ________, which codes for ________.
A. GGG; alanine B. CCC; glycine C. TTT; arginine D. UUU; phenylalanine E. AAA; proline