Which of the following additions have been made to principles of the central dogma of biology?
A. RNA can be used to regulate gene function.
B. DNA codes for proteins.
C. DNA information cannot be converted into RNA information.
D. Protein information can be converted into DNA information.
E. All of these choices are correct.
Answer: A
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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.
Antimicrobial agents that usually kill target organisms are said to be:
a. bactericidal. b. antibiotic. c. bacteriostatic. d. antagonistic.
Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood. The protozoan uses the end products of the cellulose breakdown (glucose). This is a(n) ________ relationship.
A. mutualistic B. parasitic C. commensualistic D. antagonistic
Chart the path of blood through the heart, including the valves passed. What will be an ideal response?