In some arthropods tagmatization has produced a combination of head and thorax known as a

A. larval instar.
B. thoracotomy.
C. cephalothorax.
D. headless mite.
E. fused corpora.


Answer: C

Biology & Microbiology

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_____ is the process through which a tumor supports its growth by creating its own blood supply.

a. Metastasis b. Angiogenesis c. Neoplasm d. Malignant tumor

Biology & Microbiology

Which antibody is concentrated in the respiratory tract?

A. IgD B. IgG C. IgA D. IgE E. IgM

Biology & Microbiology

How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?

A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.

Biology & Microbiology

The __________ is a word added to the genus name to identify which one of several species within the genus we are discussing. 

A. specific epithet B. scientific name C. family D. subspecies

Biology & Microbiology