The organisms originally responsible for putting oxygen in Earth's atmosphere lived around
A) 3.5 million years ago.
B) 3.5 billion years ago.
C) 6 billion years ago.
D) 1.5 million years ago.
E) 2.4 billion years ago.
E
You might also like to view...
You discover an organism that has a nucleus but no mitochondria. This organism could be a
a. euglenoid. b. diplomonad. c. kinetoplastid. d. ciliate. e. dinoflagellate.
Which of the following characteristics is not associated with nemerteans?
A. presence of a true coelomic space, the rhynchocoel B. blood vessels C. a heart D. a proboscis E. a tube-within-a-tube body plan
You have determined the base sequence for a gene from Felis catus (domestic cat) that you believe may be involved in feline leukemia
The nucleotide and probable amino acid sequences are similar to retroviral proteins that become embedded in the host cell membrane. You separate the membrane fraction of feline leukemia cell lysate from the cytoplasmic fraction. What technique could you use to determine if your protein of interest is present in the membrane fraction? A) affinity chromatography B) liquid chromatography followed by mass spectrometry C) Southern blot analysis D) two-dimensional gel electrophoresis E) liquid chromatography followed by mass spectrometry or two-dimensional gel electrophoresis
The more alcohol present in the breath sample, the (greater/smaller) the absorbance observed by the Intoxilyzer.
What will be an ideal response?