Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief _____
A) mitosis
B) membrane depolarization
C) vitellogenesis
D) acrosomal reaction
B
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What protozoan parasite is acquired by the oral route, but once ingested can readily cross the placenta causing an infection in the fetus that can result in a number of congenital defects?
A. Cyclospora cayetanensis B. Giardia intestinalis C. Cryptosporidium parvum D. Toxoplasma gondii
A gene may have many alleles, but a person has only two alleles for a gene, because
A) having more than two alleles is always lethal. B) a gene can be altered in many ways, but a person has only two copies of any gene. C) a genotype is haploid because of meiosis. D) having more than two alleles unbalances the chromosomes.
Recombinant strains of ________ are released to colonize plant roots to produce an insecticide to destroy invading insects.
A. Saccharomyces cerevisiae B. Pseudomonas syringae C. Escherichia coli D. Pseudomonas fluorescens E. Thermus aquaticus
Inflammatory mediators attract phagocytes such as _____________ to the site of inflammation.
What will be an ideal response?