When comparing the actual number of genes, the organism with the highest number is 

A. rice.
B. yeast.
C. fruit fly.
D. human.


Answer: A

Biology & Microbiology

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The infectious dose

A. is the same for all microorganisms. B. may be 10-100 cells for Salmonella. C. is expressed as ID50. D. is defined as the number of microbes necessary to ensure infection. E. is expressed as ID50 AND is defined as the number of microbes necessary to ensure infection.

Biology & Microbiology

Our closest extinct relative is ____

a. Homo erectus b. Homo habilis c. Homo neanderthalensis d. Australopithecus afarensis e. Australopithecus africanus

Biology & Microbiology

Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?

A. The S strain would be transformed into the nonvirulent R strain and kill the host. B. The R strain would be transformed into the virulent S strain and kill the host. C. The S strain would be transformed into the nonvirulent R strain and not affect the host. D. The R strain would be transformed into the virulent S strain and not affect the host. E. Neither the S nor the R strain would change.

Biology & Microbiology

Which of the following is common to both meiosis and mitosis?

a. DNA replication must occur prior to these divisions. b. Homologous pairs must form. c. Cytokinesis occurs twice. d. The chromosome number does not change

Biology & Microbiology