The event called the Cambrian Explosion resulted in an abrupt increase in
A. geological activity.
B. diversity of major animal groups.
C. algal diversity.
D. the number and size of glaciers.
E. the amount of fish, of a single species, in the seas.
B. diversity of major animal groups.
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Recall that cultivated bananas are often at greater risk of bacterial or fungal infection compared to their wild counterparts. Why? Select all correct choices
A. Cultivated bananas reproduce asexually. B. Cultivated bananas reproduce sexually. C. Ample genetic diversity exists in cultivated bananas. D. Genetic diversity is limited in cultivated bananas.
How is the central portion of a T cell receptor complex functionally analogous to the center of the B cell receptor complex?
A. It has two pieces (chains), just like a B-cell receptor. B. Both receptors bind epitopes (small amino acid sections of antigen molecules). C. Both bind structures directly on the surface of microbes. D. Both can be secreted from lymphocytes to bind to pathogens under certain situations.
Which of the following cells contain a plasma membrane?
A) Animal cells only B) Animal cells and plant cells only C) Animal cells, plant cells, and bacterial cells D) Bacterial cells only
The members of a homologous pair of chromosomes
a. are identical in size and appearance. b. contain identical genetic information. c. separate to opposite poles of the cell during mitosis. d. are found only in haploid cells. e. are present only after the S phase.