The earliest multicellular animals in the fossil record are
A) sponges. B) mammals. C) kelp. D) worms. E) trilobites.
A
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What is the name of the birth defect in which the neural tube fails to close completely?
a. neurulation b. fossa ovalis c. organogenesis d. spina bifida e. capacitation
If an AABB strain is mated with an aabb strain, an AB gamete produced by the resulting F1 is
A) impossible. B) parental. C) recombinant. D) the most common. E) None of these
The process in which DNA is released by lysis of one bacterium, leading to a change in phenotype of that another bacterium is called
A. Transduction B. Transformation C. Conjugation D. Transposition
The perforin-granzyme pathway involves
A) the production of fever, which kills the pathogen. B) the production of antibodies toward the invading pathogen. C) the production of special cell-killing proteins that act on infected or abnormal cells. D) presenting the foreign antigen to B cells. E) binding CD95L to infected cells, which eventually leads to cell apoptosis.