A heterogeneous environment is typically a ______ factor against the fitness of the population
A. Negative
B. Positive
C. Neutral
A
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Flexible bacteria with a helical shape are called
A. coccobacilli. B. spirilla. C. spirochetes. D. vibrios.
Which chemicals are natural pain suppressors?
a. substance P b. bradykinins c. prostaglandins d. histamine e. endorphins
The more frequently an action potential is triggered by a stimulus, the greater the intensity of the sensation
Indicate whether the statement is true or false
One of the first steps in obtaining a karyotype (such as that shown below of a cancer cell) is treating cells with a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?
A. Only mitotic chromosome DNA is separated into single strands, allowing for staining by dyes. B. Only in mitosis are homologous chromosomes paired up. C. Only mitotic chromosomes are highly condensed and visible with a light microscope. D. Only mitotic cells contain homologous chromosomes, because mitosis happens after DNA replication.