Biology, 24.02.2020 19:45 Vanessabattags4581
Avery and his colleagues extracted material from a killed sample of lethal bacteria. They eliminated carbohydrates, proteins, fats, RNA, and DNA from the extract and showed that exposure to the DNA alone could make non-lethal bacteria become deadly. What does this observation demonstrate about DNA?
Answers: 1
Biology, 21.06.2019 22:30
How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.
Answers: 2
Biology, 22.06.2019 13:00
How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?
Answers: 3
Biology, 22.06.2019 20:00
In figure 1-2 what is the distance from point b to point c?
Answers: 3
Biology, 22.06.2019 20:50
The genetic code is essentially the same for all organisms. based on this information, one can logically assume which of the following statements to be correct? a. dna was the first genetic material. b. the same codons in different organisms translate into the different amino acids. c. different organisms have different numbers of different types of amino acids. d. a gene from an organism can theoretically be expressed by any other organism. e. all organisms have experienced convergent evolution.
Answers: 3
Avery and his colleagues extracted material from a killed sample of lethal bacteria. They eliminated...
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