A cactus spine and a pea tendril illustrate homoplasy because both are modified leaves
__________________ Indicate whether the statement is true or false.
F, homology
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Structures that have no apparent function but had a function in ancestral species are
A. the fossil record. B. the molecular record. C. homology. D. development. E. vestigial structures.
The slender, rootlike structures found in nonvascular plants are called ____
a. thalli b. rhizomes c. gametangia d. protonema e. rhizoids
Prions cause damage to the brain by
a. causing normal proteins to change shape. b. enzymatically destroying brain cells. c. cleaving all the oxygen from that area of the brain. d. binding to bacteria in the brain and stimulating them to kill tissue. e. none of these.
________ is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age.
A. Tay-Sachs disease B. Hemophilia C. Huntington's disease D. Cystic fibrosis E. Sickle cell anemia