The early Earth's atmosphere was not the same as it is today.
Answer the following statement true (T) or false (F)
True
The early Earth's atmosphere was not the same as it is today. It would have had little, if any, oxygen.
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Each orbital can hold ________ electron(s)
a. 3 b. 1 c. 4 d. 2
The end product of a biosynthetic pathway often acts to block the initial step in that pathway. This phenomenon is called
A) substrate activation. B) feedback inhibition. C) allosteric activation. D) denaturation. E) irreversible inhibition.
Which of the following describes a cytotoxic autoimmune reaction?
A) Antibodies react to cell-surface antigens. B) Antibodies are not made. C) Cells are killed. D) Immune complexes form. E) Mediate by T cells.
If there are 12,000 kg. in the base of an ecological pyramid, how many kg. will be found in the body tissue of the tertiary consumers?
A. 6000 kg. B. 12 kg. C. 120 kg. D. 12000 kg. E. 1200 kg.