Mutations in a normal growth-stimulating gene are most likely to have no effect or to cause
A) the loss of responsiveness to growth stimulation in the cell with the mutant gene.
B) the cell with the mutant gene to become cancerous.
C) excessive growth in the cells surrounding the one with the mutant gene.
D) a mutator effect in the cell with the mutant gene.
E) apoptosis of the cell with the mutant gene.
A
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Hantaviruses are most commonly transmitted by ________ of virus-contaminated rodent ________
A) inhalation / saliva B) inhalation / excreta C) ingestion / saliva D) ingestion / excreta
DNA is believed to have replaced RNA as the main information molecule because _____
a. DNA contains thymine and RNA does not. b. DNA is double-stranded and breaks less easily. c. DNA can store more protein-building instructions in less space. d. RNA can also function as an enzyme. e. RNA can regulate gene expression.
You start to fall but then catch yourself, regaining your balance. Which of the following brain regions is responsible for the rapid coordination of muscle activity that kept you from falling?
A) motor cortex B) thalamus C) cerebellum D) pons
What is a dominant allele?
A. An allele that has no noticeable affect on an organism's phenotype B. In a heterozygous individual, the allele that determines the phenotype C. An allele that is very prevalent in a population D. An allele that will only have an affect on phenotype in a haploid organism; otherwise its presence will be masked E. An allele that totally beats up on a recessive allele