Two reasons for two selectable markers in a YAC vector are:
A. to insure the EcoRI digest is complete.
B. to insure the desired recombinant construct has telomeres on both ends.
C. to contribute to the centromere structure.
D. to increase transformation efficiency.
E. to eliminate the possibility of screening unstable recombinants.
B and E
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Where is the organ of Corti located?
A. in the cochlear duct B. in the upper canal of the cochlea C. in the lower canal of the cochlea D. in the semicircular canals
Why are massive main-sequence stars not likely to have planets that contain life?
a. The life zones around these stars is too small. b. These stars would sweep away all of the material from which planets could form. c. These stars are too hot to allow water to exist as a liquid on any planets that might form. d. These stars are on the main sequence for too short a time to allow life to evolve. e. These stars are almost always binaries and planetary orbits are unstable around binaries.
Why is the separate types hypothesis considered so unlikely by most biologists?
A) If different types of life evolved independently, it would be obvious in the fossil record. B) There are multiple similarities in all life at the cellular level that strongly suggest a common origin for all living things. C) The separate types model hypothesizes many changes in living things over time, while the fossil record suggests that few of these changes have occurred. D) The similarity in appearance in many living things suggests that there must have been only one common ancestor.
T or F: a primary function of skeletal muscle is to maintain posture
What will be an ideal response?