Which of the following can be used to isolate pure cultures of bacteria from mixtures?
A. Streak plates
B. Pour plates
C. Spread plates
D. All of the choices are correct.
Answer: D
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Antibodies are formed by which cells of the immune system? Select all correct choices
A. phagocytes B. B cells C. natural killer cells D. T cells E. mast cells
Three disadvantages of utilizing microarrays for transcriptome analysis are that microarrays (select all correct choices):
A. require large quantities of RNA to hybridize and thus show a positive signal. B. show high levels of nonspecific (background) hybridization. C. may not have DNA to which specific RNAs will hybridize. D. will not allow comparison of transcription between cell types. E. do not accurately report transcriptional levels of specific mRNAS. F. are not able to detect and evaluate rare allele variant transcripts.
Which of the following traits is not characteristic of amphibians?
a. carnivorous as adults b. four-chambered heart c. needing water to breed d. evolved from lobe-finned fish
Chitin is a polymer composed of N-acetyl glucosamine monomers
__________________ Indicate whether the statement is true or false.