The oldest fossils of eukaryotes have been estimated to be
A. 1995 years old.
B. 4.5 billion years old.
C. 1.5 billion years old.
D. 6000 years old.
E. 8 billion years old.
Answer: C
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Which one of the following statements about the laws of thermodynamics is incorrect?
A. Highly organized living organisms like animal cells are exceptions to the Second Law of Thermodynamics. B. The addition of energy increases the disorder of a system. C. In order to comply with the First Law of Thermodynamics, the conversion of energy from one form to another in biological reactions is 100% efficient. D. Highly organized living organisms like animal cells are exceptions to the Second Law of Thermodynamics and the addition of energy increases the disorder of a system E. Highly organized living organisms like animal cells are exceptions to the Second Law of Thermodynamics, the addition of energy increases the disorder of a system and in order to comply with the First Law of Thermodynamics, the conversion of energy from one form to another in biological reactions is 100% efficient
Based on the experimental design, which variable was the dependent variable?
A. Germination rate B. Type of light C. Seeds in the dark D. Moisture E. Temperature
Individuals who are ____ for sickle cell hemoglobin tend to be ____ resistant to falciparum malaria, but do not
experience the effects of sickled red blood cells.
a. homozygous dominant; more b. homozygous dominant; less c. homozygous recessive; less d. heterozygous; more e. heterozygous; less
Collagen Provides Tensile Strength in Plant Tissues. A yeast cell that enters mitosis prematurely before reaching normal size in G2 will appear as elongated cells.
a. true b. false