Mutation in which of the following genes involved in DNA repair is linked to breast and ovarian cancers?
A. BRCA-1/BRCA-2
B. Hereditary nonpolyposis colon carcinoma (HNPCC)
C. ATM
D. p53
E. Rb
Ans: A. BRCA-1/BRCA-2
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In subarctic saltmarshes, scientists have found that the addition of calcium has no effect on productivity, but additional iron does increase productivity. In this example, iron
A. is a precursor to calcium. B. stimulates evapotranspiration. C. biomagnifies in the marsh plants. D. is a limiting factor. E. blocks the effect of calcium.
These are parasitic flatworms.
A. roundworms B. turbellarians C. flukes D. protozoans
this image shows a sagittal section of the male reproductive system. What does 4 represent
What will be an ideal response?
Supporters of globalization believe that tougher environmental regulations and stricter labor standards are a natural aspect of economic progress.
a. true b. false