There are many types of cancer. What do all types of cancer have in common?
A. shortened telomeres
B. uncontrolled cell division
C. apoptosis (programmed cell death)
D. uncontrolled tumor supressor genes
Ans: B. uncontrolled cell division
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Why are most sexually transmitted diseases (STDs) transmitted only by intimate person-to-person contact?
What will be an ideal response?
Mycorrhizae, specialized symbiotic associations between the roots of plants and fungi, are characteristic of
A. all plants. B. about 90% of all plants. C. about 60% of all plants. D. about 40% of all plants. E. about 20% of all plants.
Cancer does not typically follow a Mendelian pattern of inheritance because it is usually caused by
A) two gene variants, one dominant and one recessive, and no environmental input. B) specific combinations of alleles and an environmental factor. C) specific combinations of an environmental factor and one dominant gene variant. D) genes that cause death before birth.
Who of the following provided the evidence needed to discredit the concept of spontaneous generation?
A. Koch B. Pasteur C. Semmelweiss D. Lister