Hominins refers to members of all the different species in the lineage leading to humans
A. true
B. false
A
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Which of the following would allow a cell to self-regulate its own secretion of chemical signals?
A. autocrine signals B. paracrine signals C. hormones D. pheromones E. neurotransmitters
The ENCODE project examined
A) the chicken genome, to learn more about dinosaurs, whose DNA was not preserved. B) the part of the human genome sequence that does not encode protein. C) the genes that account for our anatomy and physiology. D) a representative 1 percent of the human genome.
Which of the following statements concerning calcium ions is FALSE?
a. They are involved in fertilization, blood clotting, and microtubule disassembly. b. Their concentration in the cytosol rises when Ca2+ gates open in the ER. c. Their concentration in the cytosol is usually higher than in the extracellular fluid. d. They can act by themselves, without binding to calmodulin. e. They can exert an effect after binding to calmodulin.
Although similar to eukaryotic photosynthetic organisms, cyanobacteria are different because they ________.
A. do not have chloroplasts B. have only photosystem I not photosystem II C. do not have any photosynthetic membranes D. have only photosystem II not photosystem I