Why is it difficult to make drugs that effectively fight against hiv?

What are transgenic organisms? Give one advantage of a transgenic crop.

The presence of chyme in the duodenum stimulates which hormones

Develop two criteria that would identify the three muscle tissues in two steps when viewed under a microscope

An operon is:A) a gene coding for a repressor protein. B) a region of DNA consisting of the promoter, operator, and coding sequence for more than one protein. C) a region of DNA consisting of the operator and coding sequence for structural proteins.

Select all that apply: Which of the following affect (s) the half-life of a radioactive substance? A. the type of isotope B. the temperature of the substance C. the addition of a catalyst D. the mass of the substance

Which statement about sister chromatids is true? One sister chromatid is inherited from each parent. Sister chromatids are always in every cell. Sister chromatids are used only for reproduction. Each sister chromatid forms a lobe of a chromosome.

Select all that apply: Which of the following affect (s) the half-life of a radioactive substance? A. the type of isotope B. the temperature of the substance C. the addition of a catalyst D. the mass of the substance

Which of the following two statements describe benefits of bio technology in medicine 1. using stem cells to treat disease 2. using antibiotics to treat infection 3. diagnosing genetic diseases 4. producing antibodies such as antitoxins 5.

The ribosomes in eukaryotic cells are larger than the ribosomes in prokaryotic cells. Furthermore, eukaryotic ribosomes are not affected by some chemicals that affect prokaryotic ribosomes, a fact that can be put to good use by microbiologists

Excessive use of fertilizers has little impact on aquatic life. Explain.