Answer the question using the accompanying figure.Which number identifies the structure that transmits auditory
signals to the brain?
a. 2
b. 6
c. 7
d. 8
e. 9
ANSWER: c
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Why do some scientists believe that RNA was the first information storage molecule?
a. because some viruses use RNA as their information storage molecule b. because RNA can be a catalyst as well as an information storage molecule c. because amino acids cannot form peptide bonds without ribosomes to catalyze their formation d. because RNA is a less stable molecule than DNA e. because proteins are made of far more amino acid monomers (over 20) than RNA (4)
Which forms of nitrogen are readily usable by plants?
a. NH4 + and NO3 ? b. NH4 + and NO2 ? c. N2 and NH3 d. NH4 and NH3 e. NO3 ? and NO4 ?
What occurs when a photosynthetic protist is taken up by a heterotrophic protist and evolves into a chloroplast?
a. multicellularity b. primary endosymbiosis c. colonialism d. chloroplasty e. secondary endosymbiosis
The viral chromosome of a bacteriophage can never integrate into the host bacterium's chromosome
Indicate whether the statement is true or false