Recall from the text in the example of cell communication in streptococcus pneumoniae that the rate of dna uptake by pneumococcal cells increases sharply when they are at high density, due to changes in gene expression brought about by signaling between cells. if the pneumococcal cells did not express receptor protein, how would the rate of dna uptake be affected when the cells reach high density?

How do you date a sample of rock that you suspect as being one of the earliest on earth

The part of the eye that closes and opens to let light in is .

Select all the correct answers. for a claim about the natural world to be considered scientific, what attributes must it have? a). it must be open to modification if new evidence doesn't completely support it. b). it must be based on scientific observations that can be repeated in a controlled setting. c). it must be applicable to future events and occurrences. d). it must be consistent with only a small portion of relevant observations or data.