Why are endospores used to measure the effectiveness of autoclave sterilization?
A) Endospores are easy to store in the lab until needed.
B) Endospores are very simple structures and easy to detect.
C) Endospores are very hard to kill.
D) Endospores are composed of all the molecules found in living cells.
E) Endospores of different bacteria are destroyed at different temperatures and can be used to calibrate autoclave temperatures.
C
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The cerebrum is known for cognition. Cognitive abilities include:
A. posture and balance B. motor skills C. memory and learning D. ability to maintain homeostasis
Steroid hormones ____
a. are proteins b. include testosterone, estrogens, and cortisol c. never activate second messengers d. never alter membrane transport of ions e. are large nonpolar molecules
Which statement about this diagram is true?
a. The chromosomes of a human egg cell are shown.
b. The colors correspond to chromatin density.
c. The chromosomes arranged by size and order are the karyotype.
d. The chromosomes of a prokaryote cell are shown.
The sulfur biogeochemical cycle is a sedimentary cycle with essentially no gaseous cycle
Indicate whether the statement is true or false