Swiss cheese production involves two fermentation stages
What will be an ideal response?
lactobacillus helveticus and streptococcus salvarius
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The most common form of hemophilia is a defect in blood clotting factor VIII, which is caused by a recessive form of a gene carried on the X chromosome. A girl is born with hemophilia. Both parents have normal phenotype
Which of the following might explain this girl's hemophilia? A. A nondisjunction event in sperm production resulted in her receiving X and Y chromosomes from her father, and an X from her mother; she is XXY. B. Nondisjunction during egg formation resulted in her receiving no X chromosome from her mother, but an X from her father; she is XO. C. Nondisjunction during sperm formation resulted in her receiving no sex chromosome from her father and an X chromosome from her mother; she is XO. D. Nondisjunction during egg formation resulted in her receiving two X chromosomes from her mother and an X chromosome from her father; she is XXX. E. She inherited an X chromosome from her father and the X carrying the defective allele from her mother.
Which of these is not a method used by ectotherms to affect body temperature?
A. countercurrent heat exchange B. basking in the sun C. shivering D. dilation or contraction of blood vessels E. increasing metabolic rate
What kind of population spacing would you expect for a species that is strongly territorial?
A. uniform B. clumped C. random D. uniform or clumped depending on whether it is a source or sink metapopulation E. uniform or clumped depending on the life history strategy of the species
How does the antibiotic rifampicin prevent transcription of RNA?
A) Rifampicin blocks binding of RNA polymerase to the promoter. B) Rifampicin prevents chain elongation by preventing formation of the phosphodiester bond. C) Rifampicin prevents the chain termination, so transcripts are too long and are rendered nonfunctional. D) Rifampicin blocks ribosomal RNAs from forming functional ribosomes. E) Rifampicin blocks translation by preventing the mRNA from being processed.