An individual generally acquires natural active immunity after

A. An infusion of T lymphocytes
B. An injection of IgG
C. Suffering an illness
D. A blood transfusion
E. Taking immunosuppressive drugs


Answer: C. Suffering an illness

Biology & Microbiology

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Compare animal and plant cells; how are they different? How are they the same?

What will be an ideal response?

Biology & Microbiology

Sex chromosomes are

a. completely different between the two sexes. b. partially homologous but also have unique regions. c. found only in males. d. unable to line up properly at the metaphase plate. e. completely homologous but always have different alleles.

Biology & Microbiology

Based upon shared features, which two species have the closest evolutionary relationship?

a. Mice and humans b. Lizard and humans c. Mice and worms d. Lizards and worms e. Fish and humans

Biology & Microbiology

The 7 characters studied by Mendel are examples of single gene traits. They are called this because:

A: there is only a single genotype for all individuals. B: distinct phenotypes are produced by variant alleles of a single gene. C: there always is 1 dominant allele and 1 recessive allele for a given character. D: all of the above

Biology & Microbiology