Dry heat
A. is less efficient than moist heat.
B. will sterilize at 121°C for 15 minutes.
C. includes tyndallization.
D. is used in devices called autoclaves.
E. cannot sterilize.
Answer: A
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Which organ system collects and returns some tissue fluid to the bloodstream and defends the body against infection and tissue damage?
1.Circulatory system 2.Endocrine System 3.Lymph system 4.Urinary system
In yeast in the presence of galactose, you unexpectedly find that transcription is still blocked. Assuming Gal80 is present and functional, which other protein may be mutated to prevent transcriptional activation?
A) Gal2 B) Gal3 C) Gal4 D) Mig1 E) Gal10
Somatic receptors distributed throughout the body are linked to sensory neurons that send impulses to which one of the following regions of the brain?
A) pons B) medulla oblongata C) parietal lobe D) frontal lobe E) occipital lobe
Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are
A) single nucleotides. B) two-nucleotide sequences. C) three-nucleotide sequences. D) nucleotide sequences of various lengths.