When plants colonized land, they dramatically changed conditions on Earth by altering the global ____ cycle

a. carbon
b. hydrologic
c. nitrogen
d. phosphorus
e. sulfur

ANSWER: a

Biology & Microbiology

Which of the following is NOT a legume?

a. beans b. clover c. peanuts d. peas e. wheat

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Biology & Microbiology

The phenotype of ____ does not develop until adulthood

a. muscular dystrophy b. Marfan syndrome c. cystic fibrosis

d. hemophilia e. Huntington’s disease

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Biology & Microbiology

? What is the item labeled "B" in the accompanying figure?

A. The enzyme B. The substrate C. The active site D. The transition state E. The product

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Biology & Microbiology

Which of the following is a by-product of the catabolism of proteins?

A) lactic acid B) acetyl-CoA C) proteases D) ammonia E) carbon dioxide

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Biology & Microbiology