Which of the following statements about mutations is false?
A) Mutations are essential to variation within species.
B) Multicellular organisms evolve faster than unicellular organisms.
C) A mutation in a single-celled organism is more likely to be passed to daughter cells than a multicellular organism.
D) Mutations are essential to evolution within species.
E) A mutation is a change in the genetic material of a cell or virus.
Answer: B
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Why is cancer described as a disease of altered gene expression?
a. Gene expression controls lipid raft formation. When lipid rafts fail, cell to cell communication can break down, resulting in cancer. b. Mutated genes can trigger demyelination of the nerve cells, causing breakdown of nerve signal transmission and resulting in tumor formation. c. Mutated genes can result in proteins that behave erratically or fail to function. If they function in cell cycle control, the result can be out of control, cancerous growth. d. This statement is mostly untrue as gene expression has very little control over the development of cancer.
Tissue whose cells are striated and fused at the ends
by adhering junctions so that the cells contract as a unit is __________ muscle. a. smooth b. skeletal c. visceral d. cardiac e. none of these
Where on this phylogenetic tree of primate evolution do you find evolution of the hominines?
A. No. 1 B. No. 2 C. No. 3 D. No. 4 E. No. 5
Sexual reproduction occurs in the ___ host
a. intermediate b. definitive