A newly described bacterial species has been shown to use CO2 as its carbon source. Its energy source and its source of reducing power (electrons) are inorganic chemicals. Which term would best describe this nutritional type?
A. Chemolithoautotroph
B. Photoorganoheterotroph
C. Chemolithoheterotroph
D. Photolithoheterotroph
Answer: A
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Which of these types of islands is predicted to have the least species?
A. small island near mainland B. large island near mainland C. large island far from mainland D. small island far from mainland E. small island near mainland or large island near mainland
In the United States, most newborns undergo a screening test for up to 60 genetic disorders. A few drops of blood is taken from each baby and the levels of various blood components are determined. The screening identifies babies who might have a genetic disorder, but is not diagnostic. Further testing is required if the screen shows a blood component is out of the normal range. Which of the following technologies could potentially be a low-cost replacement for the current newborn screening and would directly test most babies for the presence of many genetic disorders?
A) PCR to amplify the PKU gene B) exome sequencing and comparison with known mutations in databases C) DNA fingerprinting using CODIS SSRs D) preimplantation genetic diagnosis
The thin outer layer (1 to 2 mm thick) of each hemisphere of the brain that serves to increase the surface area by being arranged in a folded manner is called the ________
Fill in the blank(s) with correct word
Some mutations do not affect an organism's phenotype. Other mutations cause minor changes, and still others cause major changes. Which is most likely to cause a major change in an organism's phenotype?
A) a substitution of a single base B) an insertion of three consecutive bases C) the deletion of one arm of a chromosome D) a deletion of two bases at the end of a gene