Which of the following is an example of a trade-off imposed on an organism that results in a medical prob-lem?
a. Patients who became infected by a novel flu strain had had no previous exposure to that partic-ular strain.
b. Sturdier bones would prevent fractures but would also slow down organisms.
c. The crossing of air and food pathways in humans increases the risk of choking.
d. Recent changes in human diet contribute to metabolic diseases.
B
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Two strains of S. cerevisae (yeast) are crossed. One has the genotype A B and the other a b. Which statement correctly describes the tetrads that can be produced by one reciprocal exchange without gene conversion in the dihybrid?
A) Recombination occurs at the four-strand stage to produce a tetrad with A B, A B, a B, and a b chromosomes. B) Recombination occurs at the four-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes. C) Recombination occurs at the two-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes. D) Recombination occurs at the two-strand stage to produce a tetrad with A b, A b, a B, and a B chromosomes.
The production of new blood cells requires the activity of ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following describes the effector response of sweat glands and blood vessels?
a. sweat glands release sweat and blood vessels dilate b. sweat glands stop releasing sweat and blood vessels dilate c. sweat glands release sweat and blood vessels constrict d. sweat glands stop releasing sweat and blood vessels constrict
Unlike bacteria, most archaeons have linear chromosomes with multiple origins of replication.
Answer the following statement true (T) or false (F)