Which of the following plants represent the
oldest living plant lineage?
a. hornworts
b. liverworts
c. mosses
d. ferns
e. conifers
B
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Chytrids are unique among fungi in that they produce ________ spores
a. flagellated b. haploid c. two tailed d. non-motile e. diploid
The research of James A. Thompson and his coworkers shows that sustainable human stem cell
colonies can be established. As experimental evidence of this, they showed that
a. human stem cell colonies could survive outside the body if exposed to a bed of mouse fibroblasts. b. stem cell telomerase remained inactive in established cell colonies. c. cultured stem cells could differentiate when injected into apes. d. cultured stem cells could differentiate when injected into chicken embryos. e. human stem cells could on differentiate into muscle tissue.
Special cells found in the gonads that give rise to gametes upon division are called
a. germ cells. b. somatic cells. c. stem cells. d. basal cells. e. egg cells.
The cell junction labeled “C” in the figure
a. prevents movement of materials between cells. b. is found in tissues subjected to stretching. c. anchors cells to each other and to the intracellular matrix. d. is found abundantly in surface epithelia. e. is found in most tissues except heart muscle.