Nisin
A. is a food additive that blocks the growth of some gram positive bacteria.
B. is a small amphiphilic peptide that disrupts membrane integrity and function.
C. is a bacteriocin produced by some strains of Lactococcus lactis.
D. All of the choices are correct.
Answer: D
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If a producer wants to prevent certain fruits from ripening they would apply:
A. gibberellins B. auxins C. ethylene D. cytokinins E. ethanol
Choose the true statements about the evolution of eyes in mice and fruit flies.
_____ The gene Pax6 codes for a transcription factor involved in lens formation in the mouse. _____ In the fruit fly, the gene eyeless codes for a transcription factor involved in lens formation. _____ When the mouse gene Pax6 is inserted into a fruit fly, it causes a vertebrate-type lens to form on the fly's leg. _____ The sequences of the genes eyeless and Pax6 are very different.
You have a friend who lost 7 kg (about 15 pounds) of fat on a regimen of strict diet and exercise. How did the fat leave his body?
A) It was released as CO2 and H2O. B) It was converted to heat and then released. C) It was converted to ATP, which weighs much less than fat. D) It was converted to urine and eliminated from the body.
Male gamete having a haploid number of chromosomes and the ability to fertilize an egg, the female gamete.
What will be an ideal response?