The excretory structures of terrestrial arthropods are slender projections from the digestive tract that are attached at the junction of the midgut and hindgut. These are called
A. flame cells.
B. Malpighian tubules.
C. ocelli.
D. kidneys and bladders.
E. nephridia.
Answer: B
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened?
A. Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution. B. Due to its size and polarity, iodine was able to enter the dialysis bag and interact with starch. C. Over time, both iodine and starch are equally distributed throughout the two solutions.
Removal of which of the following lymphoid organs would be most detrimental to immune function in an infant?
What will be an ideal response?
Detecting single nucleotide polymorphisms (SNPs), fusion genes, and mRNAs for alternative splicing are three
applications of ____________________ Fill in the blank(s) with the appropriate word(s).