What type of animals live in a multigenerational family group in which sterile workers carry out all tasks essential to the group's welfare, while other members of the group produce offspring?
a. selfish herd
b. eusocial animals
c. dominance hierarchy group
d. social animals
e. monogamous animals
b
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Chronic myelogenous leukemia (CML) results from a translocation between human chromosomes 9 and 22. The resulting chromosome 22 is significantly shorter than usual, and it is known as a Philadelphia (Ph') chromosome
The junction at the site of the translocation causes overexpression of a receptor tyrosine kinase. A new drug (Gleevec or imatinib) has been found to inhibit the disease if the patient is treated early. Which of the following would be a reasonably efficient technique for confirming the diagnosis of CML? A) searching for the number of telomeric sequences on chromosome 22 B) looking for a Ph' chromosome in a peripheral blood smear C) enzyme assay for receptor tyrosine kinase activity D) fluorescent labeling to determine the chromosomal location of all chromosome 22 fragments E) identification of the disease phenotype in review of the patient's records
The diploid portion of a plant life cycle is known as the:a
parental generation. b. sporophyte generation. c. daughter generation. d. gametophyte generation. e. reproductive generation.
What is not used as evidence for classifying different populations as multiple species according to the biological species concept?
A. Phylogenetic trees of sympatric species that show divergence into monophyletic groups B. Phenotypic markers that indicate reduced gene flow C. traits that affect pollinator attraction D. Successful production of environmentally fit offspring through hybridization
Which of the following is not a function of an antibody?
A) stimulate helper T cells B) neutralize toxins C) attract phagocytes D) activate complement cascade