Density-dependent inhibition is a phenomenon in which crowded cells stop dividing at some optimal density and location. this phenomenon involves binding of a cell-surface protein to its counterpart on an adjoining cell's surface. a growth inhibiting signal is sent to both cells, preventing them from dividing. certain external physical factors can affect this inhibition mechanism.
select the statement that makes a correct prediction about natural phenomena that could occur during the cell cycle to prevent cell growth.
a) as cells become more numerous, they begin to squeeze against each other, restricting their size and ability to allow cell growth.
b) as cells become more numerous, the protein kinases they produce begin to compete with each other until only one cell has the proteins necessary for growth.
c) as cells become more numerous, the amount of required growth factors and nutrients per cell becomes insufficient to allow for cell growth.
d) as cells become more numerous, more and more of them enter the synthesis part of the cell cycle and duplicate dna to inhibit cell growth.

Will mark brainliest! 1.) jan’s sister and mother have both had breast cancer. she is wondering if she should undergo genetic testing to check for a mutation of the brca1 gene. a mutation in the brca1 gene is commonly associated with, but not guaranteed to cause, breast cancer. the presence of a mutation increases a patient’s chances of getting breast cancer to about 85 percent, compared to a 13 percent risk in the general population. costs may vary, but most labs charge patients or their insurance companies less than $3,000 to sequence the brca1 to look for mutations. do you think that jan should undergo genetic sequencing? explain your answer. (2 points) what are potential pros and cons of having such tests done? (5 points) describe how the availability of genetic sequencing can affect the frequency of genetic diseases in individuals and populations. (3 points) 2.) scientists have developed genetically engineered plants that are pest-resistant. by adding genes to the plant’s dna, they become toxic to insects (but not to plants or animals). this means that these plants may not need to be sprayed with pesticides to ward off the insects. would you be willing to eat these genetically altered crops? explain your answer. (5 points) what are some possible impacts (positive or negative) of this genetically engineered plant on the environment, society, and individuals? (5 points)