A gene accumulates one mutation every 100
years. If one species splits into 2 now, how
many differences will exist in that gene
between the two in 500 years?
a. 2 d. 100
b. 5 e. 500
c. 10
C
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Small RNAs can regulate gene expression. One type, called micro RNA (miRNA), acts by binding directly to
A. mRNA to prevent translation. B. tRNA to prevent transcription. C. mRNA to prevent transcription. D. tRNA to prevent translation.
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.
In which of the following are non-complementary nucleotides recognized, excised, and replaced with correct nucleotides?
a. mismatch repair b. semiconservative replication c. Okazaki fragmentation d. nucleotide excision repair
What color smoke coming from a coal-fired power plant would indicate wasted fuel?
A- red B- clear C- black D- white E- green