Which mode of transmission is used by the HIV virus in humans?
A) sneezing
B) blood transfusion
C) tears
D) insect bite
B
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There are cases in which a person inherits a very high susceptibility to cancer. A woman who is heterozygous for a mutation in the BRCA1 gene has one functional allele that helps to suppress tumor formation and one nonfunctional allele of the same gene
She has a 50-70% chance of developing breast cancer before age 70. A tumor is likely to form when a cell "loses heterozygosity" at the BRCA1 gene. This will happen if: A. germ cells in the affected individual develop a mutation in the remaining functional allele of BRCA1. B. a somatic mutation in a breast cell inactivates the remaining functional BRCA1 allele. C. a silent mutation occurs in the remaining functional BRCA1 allele.
Where in the brain does your consciousness reside?
What will be an ideal response?
A lichen represents a symbiotic relationship between which of the following pairs?
A) a fungus and an ameba B) a yeast and an ameba C) an alga and a cyanobacterium D) an alga and a fungus
Energized myosin heads bind to actin only when ____ binds to troponin.
A. myosin B. AMP C. calcium D. ATP E. sodium