The zona pellucida is used for what?
a. protection of a mammal egg before fertilization
b. nutrition for a mammal egg before fertilization
c. recognition for a sperm cell
d. provides immunity for a mammal egg before fertilization
a. protection of a mammal egg before fertilization
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What patterns in a pedigree characterize a trait determined by the mitochondrial genome?
A. All offspring of an affected female show the trait. B. Males are never affected. C. Males never transmit the trait to their offspring. D. All offspring of an affected female show the trait, and males are never affected. E. All offspring of an affected female show the trait, and males never transmit the trait to their offspring.
Sexual reproduction involves ____
a. one diploid cell fertilizing a haploid cell b. the union of two somatic cells c. the union of male and female gametes d. a single mitotic division of the parent cell to produce a daughter cell e. the union of two gametes to produce a haploid zygote
Which of the following statements is not true of enteroinvasive E. coli (EIEC)?
A. It invades the gut mucosa. B. Blood and pus are found in the stool. C. Prompt treatment with a broad-spectrum antibiotic is essential to recover from an infection. D. It makes no heat-labile or heat-stable exotoxins. E. High fever is present.
Of the following, which is the oldest event?
a. origin of fungi b. appearance of land tetrapods c. formation of Pangea d. age of dinosaurs e. appearance of whales