Plants first moved onto land at least ________ years ago
A) 65 million
B) 475 million
C) 1.2 billion
D) 3.5 billion
B
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__________ are symbionts with young roots that enhance a plant's ability to absorb mineral ions from
soil. Fill in the blank(s) with the appropriate word(s).
Which of the following is TRUE of fetal circulation?
a. The allantois carries fetal blood to the placenta. b. Fetal hemoglobin binds oxygen more easily than the adult form. c. Fetal blood mixes with maternal blood to ensure proper gas exchange. d. Blood flow into the lungs is 50% of adult flow. e. The liver, heart and lungs receive the majority of blood flow.
What macromolecule is composed entirely of beta-glucose units?
a. starch b. chitin c. glycogen d. cellulose e. protein
Which unicellular fungus is probably in most kitchens?
a. mold b. mushroom c. yeast d. rust e. dirt