The first to make use of controlled fires were:

a. Australopithecus africanus
b. Australopithecus robustus
c. Australopithecus boisei
d. Homo habilis (early Homo)
e. Homo erectus


e

Biology & Microbiology

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Which of the following is the correct sequence of events in cross-bridge cycling?

A. Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." B. The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." C. Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs. D. Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked." E. These events can occur in any sequence without affecting muscle function.

Biology & Microbiology

Nutrient absorption is mediated by the

A. peptidoglycan layer. B. nuclear membrane. C. cell wall. D. cell membrane. E. proteins in the periplasmic space.

Biology & Microbiology

Chloroplasts differ from mitochondria in that the former have

A) DNA. B) two lipid bilayers. C) 70S ribosomes. D) thylakoids. E) cristae.

Biology & Microbiology

In Bacillus subtilis, ________ controls expression of several sporulation genes; sporulation occurs when it is highly phosphorylated

a. CtrA b. Spo0A c. NtcA d. GFP

Biology & Microbiology