Which best describes the purpose of sexual reproduction?
A. to produce offspring that are non-viable
B. to produce offspring that are genetically indentical
C. to produce offspring that exhibit greater genetic variations
D. to produce offspring that are genetically identical to their parents
Ans: C. to produce offspring that exhibit greater genetic variations
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In mammals, Hox genes:
A. specify limbs and other structures associated with each body segment. B. direct development of structures that become parts of the hindbrain, spinal cord, and vertebral column. C. evolved by partial-genome duplication from the ancestral genes. D. are expressed in a sequence that does not reflect their linear order on the chromosome or the regions they affect. E. All of these choices are correct.
Group 1 aquatic macroinvertebrates
(a) require high-quality, unpolluted water. (b) require polluted water. (c) are tolerant of a wide range of water quality conditions. (d) include leeches.
Which of the following diseases is caused by a
flagellated protozoan?
a. cholera b. African sleeping sickness c. pertussis d. malaria e. more than one of these
Stem cells developed by inserting genes that regulate the transcription of specific genes into cells from an adult are ________ cells
A) induced pluripotent stem B) embryonic disk C) gastrula D) chorionic villi E) embryonic stem