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.

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

Cross-talk between second messenger pathways is probably involved in particular types of olfactory signal

transduction in many animals.

a. True b. False

Biology & Microbiology

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

Biology & Microbiology