The shortest time required to kill all the microbes in a sample at a specified temperature is called the
A) Sporicidal time
B) Death phase point
C) Thermal death time (TDT)
D) Thermal death point (TDP)
C) Thermal death time (TDT)
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Most of today's animal phyla appear in the fossil record within a short span of 25 million years beginning about 530 MYA. When researchers analyzed the DNA evidence that might relate sponges to the modern phyla, what unexpected result did they find?
A. Many development genes thought to be specific to eumetazoans were found in sponges. B. The entire genome of sponges was found to be very different in gene diversity from the genomes of other phyla. C. Samples of the living sponge Oscarella carmela were found to be relatively unchanged from fossil sponge DNA samples. D. Most of the developmental genes found in eumetazoans are absent in the sponge Oscarella carmela. E. All of the answer choices are correct.
A stroke may occur when
a. a vessel in the brain ruptures. b. a vessel in the heart ruptures. c. a vessel in the brain is blocked by a clot. d. a vessel in the heart is blocked by a clot. e. a vessel in the heart ruptures, and a vessel in the brain is blocked by a clot
Researchers have been able to study the pathway of a secreted protein by "tagging" it with a fluorescent marker. Using this method, you would observe fluorescence moving from the ER to which organelle?
A) Plasma membrane B) Lysosome C) Nuclear membrane D) Mitochondria E) Golgi apparatus
Which refers to the addition of a repeat segment of a chromosome?
A) inversion B) translocation C) deletion D) duplication E) monosomy