Many breast cancers involve mutations in the BRCA1 gene. Explain the difference between sporadic
and familial breast cancer caused by this gene at a molecular level.
What will be an ideal response?
In order to develop breast cancer from a mutation in the BRCA1 gene, both copies of the gene must be
mutated. In sporadic breast cancer, the cell starts out with two normal copies of the gene, but over
time, a mutation arises in one copy and then the other. In familial cancer, a person inherits one normal
copy of the gene and one mutant copy. Therefore, a cell only needs to acquire a mutation in the one
normal copy of the gene.
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Fungi
A. are prokaryotes or eukaryotes, depending on the species. B. produce chlorophyll under aerobic conditions. C. produce chlorophyll under aerobic conditions and are prokaryotes or eukaryotes, depending on the species. D. are eukaryotic organisms.
Mechanical receptors can be used to stun or kill prey
Indicate whether the statement is true or false.
What type of eating disorder involves consuming large amounts of food, followed by self-induced vomiting?
A) anorexia B) bulimia C) osteoporosis D) diabetes
The atmosphere of early Earth is currently thought to have contained:a
methane, water, ammonia, nitrogen, and oxygen b. carbon dioxide, water, oxygen, nitrogen, and hydrogen c. carbon dioxide, ozone, nitric oxide, water, and hydrogen sulfide d. carbon dioxide, water, carbon monoxide, hydrogen, and nitrogen e. carbon dioxide, carbon monoxide, water, hydrogen, and nitric oxide