Four of the following statements are typically true of placoderms. Which one is the exception?
A. They gave birth to live young.
B. They had jaws.
C. They had teeth.
D. They had paired pelvic fins.
E. They had paired pectoral fins.
Answer: C
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When comparing root systems of corn plants growing on a square foot in a cornfield with the root systems of natural prairie plants growing in a meadow, what result do you expect to see?
A) The overall mass of roots will be identical in a cornfield and on a meadow. B) The mass and length of roots in a cornfield will be higher because soil is fertilized. C) The mass and length of roots on a meadow will be higher because soil is poorer and there is higher diversity of plants. D) The overall mass of roots on a meadow will be lower, but the length will be higher since roots need to grow deeper to reach nutrients.
Abiotic oxidation of Fe2+ requires oxygen; no other chemicals can directly oxidize Fe2+
Indicate whether the statement is true or false.
Gen-Probe Mycobacterium tuberculosis direct test uses which type of nucleic acid amplification test?
a. Nucleic acid sequence-based amplification (NASBA) b. Transcription-mediated amplification (TMA) c. Reverse transcriptase polymerase chain reaction (RT-PCR) d. Standard displacement amplification (SDA)
Which is NOT part of the nitrogen cycle?
a. denitrification b. deammonification c. nitrogen fixation d. ammonification e. uptake by autotrophs