Based on archaeological evidence, the first spears were made by:
a. Australopithecus africanus.
b. Neandertals.
c. Homo erectus.
d. Cro-Magnons.
e. Homo habilis.
C
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During electron transport reactions,
A) OH- accumulates on the outside of the membrane while H+ accumulates on the inside. B) OH- accumulates on the inside of the membrane while H+ accumulates on the outside. C) both OH- and H+ accumulate on the inside of the membrane. D) both OH- and H+ accumulate on the outside of the membrane.
Which process is responsible for the evolution of mitochondria and chloroplasts in eukaryotes?
a. endosymbiosis b. conjugation c. transformation d. transduction
Which term is commonly used to describe the production of valuable proteins in genetically modified plants and animals?
A) biopharming B) culturing C) genetiproduction D) faunafarming E) aniplafarming
Stress response elements (SREs) are _______ in certain plant genes that bind ________ and ________.
A: regulatory sequences; DNA methylases; enable epigenetic changes to the DNA at CpG islands. B: regulatory sequences; specific transcription factors; enable coordinated regulation of the expression of several genes. C: proteins; DNA; act like general transcription factors. D: silencers; repressor proteins; inactivate gene transcription . E: DNA sequences; inducers; cause inactivation of repressors.