One chromosomal abnormality that is usually fatal is
a. a mutation in a gene.
b. an exchange of material between homologous chromosomes.
c. extra copies of sex chromosomes.
d. the addition of an extra autosomal chromosome.
d. the addition of an extra autosomal chromosome.
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Which of the following is not a general requirement for complex multicellular life?
A. Cells must retain a full range of functions, including reproduction. B. Cells must stick together. C. Cells must communicate with one another. D. Cells must participate in a network of genetic interactions that regulate cell division. E. All of these options are requirements for complex, multicellular life.
The protein invasin is associated with
A) Yersinia psuedotuberculosis. B) the construction of an integrin network in bacteria. C) plasmodemata. D) tight-junction ridge formation. E) lubrication of joints.
Cross-talk between second messenger pathways is probably involved in particular types of olfactory signal
transduction in many animals.
a. True b. False
A requirement of cladistics is that a grouping must include ________.
A. a common ancestor and all its descendants B. species that can interbreed C. species with shared traits D. only living species