Biology, 01.01.2020 20:31 laura52677
Which of the following is a possible advantage for the environment of having farmers use plants that genetically produce bt toxin? a) plants with genes for the toxin are eaten less often by insects, and therefore less insecticide is needed. b) plants that produce bt toxin must be grown from new seeds each season, and therefore fewer of them are planted. c) bt toxin is advantageous to many species of invertebrates that grow in the same fields. d) harvesting plants with these genes is less disturbing to the soil layers where they are planted. e) plants with these genes must be sprayed with the organism, but need much less than other plants.
Answers: 2
Biology, 21.06.2019 20:40, jaycie16
Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling
Answers: 3
Biology, 22.06.2019 00:00, unknown9263
Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.
Answers: 1
Biology, 22.06.2019 00:30, savannnab1890
According to the cladogram, which organisms have roundworms as a common ancestor?
Answers: 1
Biology, 22.06.2019 06:00, nefertiri64
How can you tell the difference between rough er from smooth er?
Answers: 2
Which of the following is a possible advantage for the environment of having farmers use plants that...
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