DNA from a bacterial strain with genotype his- leu- thr- is transformed with DNA from a strain that is his+ leu+ thr+. A few leu+ thr+ transformants and a few his+ thr+ transformatns are obtained, but no his+ leu+ cells are observed. Which of the following statement is not supported by these experimental observations? a. ‘his’ and ‘thr’ are closer than ‘his’ and ‘leu’
b. ‘leu’ and ‘thr’ are closer than ‘his’ and ‘leu’
c. ‘his’ and ‘thr’ are closer than ‘thr’ and ‘leu’
d. these results do not tell anything

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen