Given the following LD50 values for Bacillus anthracis, through which portal of entry is it easiest to get anthrax?
A) ingestion: 1 million endospores
B) All are equally easy portals of entry.
C) cutaneous: 50 endospores
D) inhalation: 20,000 endospores
Ans: C) cutaneous: 50 endospores
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The two different forms of fibronectin mRNA produced by two different kinds of cells is an example of
a. transcriptional control. b. post-transcriptional control.. c. transport control. d. translational control. e. post-translational control.
A zygote is formed at this stage
a. A b. B c. C d. D e. E
Which of the following only occrus in mitosis and NOT during meiosis II?
A) Synapsis and crossing over B) Haploid chromosomes line up at the equator C) Nuclei congaing the diploid number of chromosomes D) Four haploid daughter cells result
The observation of a range of phenotypes in a genetic trait is ____
a. pleiotropy b. genomic imprinting c. codominance d. penetrance e. continuous variation