The length of a particular gene in human DNA, measured from the start site for transcription to the end of the protein-coding region, is 10,000 nucleotides, whereas the length of the mRNA produced from this gene is 4000 nucleotides
What is the most likely reason for this difference?
The gene contains one or more introns.
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True or False: It is thought that some forms of communication have evolved from a behavioral process called ritualization
A. true B. false
The portion of a sperm that carries enzymes needed for fertilization is the:
A) acrosome. B) mitochondrion. C) tail. D) nucleus.
Which of the following characteristics of genetic material accounts for the need to get a flu vaccine every year, but a polio vaccine once in a life time?
A. transmission B. variation C. information D. replication and transmission E. replication
A green colony with a black center was isolated and presumptively identified as a Salmonella spp. The organism was serotyped with polyvalent antisera; however, the antisera tested negative for all antigens. What is the next course of action?
a. Regrow the organism on sheep blood agar, and serotype again the next day. b. Make a suspension, and heat to 100°C for 10 minutes. c. Make a suspension, and place on ice for 30 minutes. d. Report the organism out as a nontypable Salmonella spp.