Which of the following is an important feature of the scientific method
a) a good hypothesis
b) if research results are not conclusive, the opinion of experts should be relied upon
c) anyone should be able to repeat an experiment
d) a researcher's methods should not be described once desired results have been obtained
e) once demonstrated, conclusions cannot be changed
Answer: c) anyone should be able to repeat an experiment
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Which one of the following nucleotides hydrogen base pairs with adenine in an RNA molecule?
A. cytosine B. thymine C. uracil D. adenine E. guanine
Why is a reducing atmosphere conducive to the origin of life?
A. It is more favorable for the development of organic molecules. B. It is rich in free oxygen. C. It is devoid of organic molecules. D. It is very similar to today's atmosphere.
Fluorescence occurs when ____
a. a high-energy electron returns to its ground state by releasing energy in a photon b. a low-energy electron moves to a high-energy state by absorbing heat c. a high-energy electron leaves its nucleus and moves to a different molecule d. a pigment molecule accepts a high energy electron and releases a photon of energy e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state
FAD becomes oxidized when it accepts hydrogen atoms and their electrons
__________________ Indicate whether the statement is true or false.