Why are cells arrested at metaphase in the preparation of a karyotype?
a. The chromosomes have duplicated, making them easier to visualize.
b. All of the sister chromatids have separated into two new daughter cells.
c. All of the chromosomes are at their least condensed state and are easy to visualize.
d. All of their chromosomes are highly condensed and easy to visualize.
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A SNP would best be described as _____
A. A gene that comes in multiple different alleles B. A balanced polymorphism system C. A single nucleotide difference between two DNA sequences D. The most likely mutation to affect protein function
The spleen, in part, functions to cleanse the
A. lymph. B. interstitial fluid. C. cytoplasm. D. blood.
This figure, and specifically the area with the question mark, depicts which concept?
1.The sea breeze
2.The land breeze
3.The rain shadow
4.The El NiƱo
Which is inncorrect concerning ulcers?
A. more than 90% are in the duodenum B. they may occur when excess acid damages tissue C. susceptibility is increased by an infection with helicobacter pylori. D. antibotics can cure an ulcer E. uclers can occur if bile fails to neutralize the acids chyme that enter the duodenum.