If the age of the Earth is 4.6 billion years old, for what percentage of this time is Earth thought to have been anaerobic?
A. 0.1% B. 27% C. 44% D. 68% E. 99.3
Answer: C
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In a double-blind test the treating physician knows who is getting the actual treatment
Indicate whether this statement is true or false.
In flowering plants, one sperm nucleus fuses with an
egg nucleus, and a zygote forms that develops into an embryo. Another sperm nucleus a. fuses with a primary endosperm cell to produce three cells, each with one nucleus. b. fuses with a primary endosperm cell to produce one cell with one diploid nucleus. c. fuses with the endosperm mother cell, forming a primary endosperm cell with a single triploid nucleus. d. fuses with one of the endosperm mother cell nuclei to produce a diploid tissue that serves as the food supply for the embryo. e. degenerates.
What is rapid shallow breathing called?
A) dyspnea B) hyperpnea C) tachypnea D) eupnea E) apnea
_____ are densely staining, highly compacted, and transcriptionally inactive regions of chromatin
a. Homochromatin b. Heterochromatin c. Histone-dependent chromatin d. Primary chromatin e. Euchromatin