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

Biology & Microbiology

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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

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The nuclear membrane re-forms during

a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.

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Food is usually contaminated by which of the following sources?

a. aerosols b. mechanical vector c. soil d. handler e. biological vector

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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

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