Which of the following statements about stem cells is TRUE?
A) They are "perpetual" parent cells that never produce daughter cells.
B) They are able to differentiate into a variety of cell types.
C) They are found only in embryos and in the bone marrow of adults.
D) They are found only in embryos.
E) They are permanently differentiated and cannot further divide.
B
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Compound eyes are composed of independent visual units called
A. apposition segments. B. ocelli. C. ommatidia. D. retinas. E. simple eyes.
Answer questions 94–98 in reference to the five plant tissues
listed below. a. parenchyma b. collenchyma c. sclerenchyma d. xylem e. phloem D 94. Ground tissue of plants, sometimes containing lignin that strengthens the adult plant. E 95. Vascular tissue that conducts and distributes food to plant cells. E 96. Vascular tissue that conducts water and dissolved salts throughout a plant. D 97. Vascular tissue of a plant composed of tracheids and vessel members. D 98. Plant tissue involved in regeneration following a wound.
Most often, genomic library screening uses ____.a. a labeled, complementary single-stranded RNA or DNA molecule called a probeb. colonies of vector bacteria on a Petri dish in order to replicate the desired genomec. recombinant
plasmids containing DNA and DNA ligase
d. cut plasmids containing recognition sites used to carry DNA molecules
e. tRNA polymerase copies with a truncated copy of a DNA template
Recent evidence suggests that the early fossils of Homo erectus may actually represent two species,
one being Homo erectus and the other species being:a. Homo sapiens. b. Homo africanus. c. Homo ergaster. d. Homo habilis. e. Homo heidelbergensis