Which of the following is a rocky, layered structure that forms over time as a mat of aquatic prokaryotic cells traps sediments?
A. Ozone layer
B. Stromatolite
C. Petroglyphs
D. Stalactites
E. Foraminifera
Answer: B
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A researcher wants to determine if a unicellular organism he discovered is an autotroph or a heterotroph
He radioactively labels the carbon in CO2 and C6H12O6, and exposes one culture of his organism to the labeled CO2 and another culture to the labeled C6H12O6. What would happen if his organism is an autotroph? A. Labeled carbon would be seen in the carbohydrates of CO2-exposed organisms. B. Labeled carbon would be seen in the carbohydrates of C6H12O6-exposed organisms. C. Labeled carbon would not be seen in the carbohydrates of either culture. D. Labeled carbon would be seen in carbohydrates of both cultures.
The mitotic stage during which chromosomes begin attaching to spindle fibers and moving randomly and reversibly to the centrosomes is
A) prophase. B) prometaphase. C) metaphase. D) anaphase. E) telophase.
Bone is composed only of nonliving material
Indicate whether the statement is true or false
The process by which light energy is used by plants, algae, and cyanobacteria to form sugar is called ________
Fill in the blank(s) with correct word