Which types of cells or cell components play an essential role in the clotting of blood?
a. erythrocytes
b. platelets
c. leukocytes
d. hemoglobin
e. plasma
b
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The figure above represents tRNA that recognizes and binds a particular amino acid (in this instance, phenylalanine). Which codon on the mRNA strand codes for this amino acid?
A) UGG B) GUG C) GUA D) UUC E) CAU
Coastal zones of contact between freshwater from streams and rivers and saltwater from the ocean are called
A) estuaries. B) headwaters. C) deltas. D) coastal upwelling zones.
During which phase does crossing-over occur?
a. interphase b. prophase I c. metaphase I d. prophase II e. metaphase II
Acidic soils have the following effect on soil nutrients and minerals:
A. they are dissolved completely B. become unavailable to the plant and adhered to clumps C. are changed in their chemical composition and become toxic D. become readily available to plants