Which aspect of the polymerase chain reaction (PCR) is mismatched with its description?
A) Taq polymerase: a DNA-replication enzyme which functions at high temperatures
B) variable temperatures: the highest temperature required for double-stranded DNA separation, the lowest temperature to allow primers to anneal, and a midrange-temperature for DNA replication
C) dNTPs: building blocks of DNA
D) template DNA: the DNA to be copied; must be present at a high concentration for the procedure to work
E) DNA primers: sequences specifically chosen to be complementary to the DNA which flanks a target gene or region of interest
Answer: D
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The Cl- ion has a single negative charge and the atomic number of 17. How many electrons are on its innermost shell?
A) 18 B) 17 C) 9 D) 2
In which of the following cell types do G1 and G2 not take place?
a. Early embryonic cells b. Budding yeast cells c. Typical proliferating human cells d. Skin fibroblasts
Which of the following is true of normal microbiotia, but not of transient macrobiotic?
A) Normal microbiota are opportunistic pathogens. B) Normal microbiota are on the human body. C) Normal microbiota cause disease. D) Normal microbiota are permanently present.
An organism with a diploid chromosome number of 46 will produce ________ combinations of chromosomes at the end of meiosis
A) 7.04 × 1013 B) 8388608 C) 529 D) 23 E) 46