Which of the following creates the least amount of soil erosion?

A) deforestation
B) poor landscaping practices that expose the land to excess wind
C) overgrazing by livestock
D) use of drip irrigation systems
E) wetland destruction


Ans: D) use of drip irrigation systems

Biology & Microbiology

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Which one of the following codons is capable of terminating translation?

A. UAG B. UAA C. UGA D. UAG and UAA E. All of these choices are correct.

Biology & Microbiology

Substance A is secreted by the liver, travels through the circulatory system bound to a carrier protein and causes a

change in gene expression in its target cell. Substance A is therefore a ligand for ____.

a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a steroid hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase

Biology & Microbiology

External fertilization is most common in animals living in

a. mountains. b. prairies. c. forests. d. oceans. e. deserts.

Biology & Microbiology

In which location would the partial pressure of oxygen be the highest?

a. inhaled air b. exhaled air c. alveoli d. pulmonary veins e. pulmonary arteries

Biology & Microbiology