Which chromosome is trisomic in Patau syndrome?

A. 13
B. 18
C. 22
D. X


Answer: A. 13

Biology & Microbiology

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All of the following are true about this image EXCEPT:

a. DNA replication has occurred. b. One pair of homologous chromosomes is present. c. The trait represented is heterozygous. d. The genotype is either pp or PP.

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Three examples of respiratory poisons are ___, ___ and ___.

Fill in the blank(s) with the appropriate word(s).

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An exoenzyme is an extracellular enzyme that may be involved int he breakdown of host defensive barriers or damage to host tissues

a. true b. false

Biology & Microbiology

What is the main reason that lung cancer develops?

A. There is exposure to allergens. B. The person's immune system is nonfunctional. C. Mitotic growth factors replicate. D. Two tumor suppressor genes undergo mutations.

Biology & Microbiology