Distinguish between stromatolites and biosignatures
What will be an ideal response?
Fossil stromatolites could be of biological origin and are layers of carbonate or silicate rock. The
biological component is hypothesized to be phototrophic prokaryotes. Biosignatures are found in
sedimentary rock. They are hypothesized to be formed by cellular activity.
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Microbial death occurs when there is
A. no reproduction. B. no movement. C. a decrease in size. D. a change in appearance. E. All of the choices occur.
Synaptonemal complex forms during
A) leptonema. B) zygonema. C) pachynema. D) diplonema. E) diakinesis.
Deoxygenated blood always flows
A) into the left ventricle. B) toward the left atrium. C) toward the right atrium. D) in the systemic circuit. E) from capillaries to arterioles.
How does determination relate temporally to differentiation?
What will be an ideal response?