The loss of O2 in the atmosphere 600-800 million years ago was likely due to the "fossilization" of organic matter

trapped in Earth's crust.



a. True
b. False


ANSWER: False

Biology & Microbiology

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The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an example of _____

a. natural selection b. genetic drift c. spontaneous mutational spread d. heterozygote disadvantage e. the founder effect

Biology & Microbiology

Anthrax is a highly infectious disease of animals that can be transmitted to humans who come in direct contact with infected animals or their products.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Patients with an abnormally long chromosome 9 have ____

a. the Philadelphia chromosome b. a rare form of eye development c. hemophilia d. Down’s syndrome e. a deletion mutation

Biology & Microbiology

Given your results from the baby's spit up/vomit, you run an X-ray while the baby is eating. This allows you to determine whether there is a blockage in the organ that generates that enzyme (physical), or if there is a problem with the enzymes themselves (chemical). Which of the following results would help you decide whether the problem is solely physical or chemical?

a. Chemical: The enzyme was spit up, but the digestive path appears normal b. Physical: The enzyme was spit up, but the digestive path appears normal c. Chemical: The enzyme was spit up, but the digestive path has a lump stopping movement of food d. Physical: The enzyme was not spit up, but the digestive path has a lump stopping movement of food e. Chemical: The enzyme was not spit up, and the digestive path appears normal

Biology & Microbiology