It was primarily the X-ray diffraction work on DNA done by ________ that allowed Watson and Crick to deduce the structure of DNA
A) Louis Pasteur B) Rosalind Franklin C) Gregor Mendel D) T.H. Morgan
Answer: B
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Teichoic acids are:
a. waxy substances that are found in some bacterial cell walls that make the cells re-sistant to toxic substances, including ac-ids. b. glycerol- or ribitol-phosphate polymers that are combined with various sugars, amino acids, and amino sugars, which are a part of the cell wall of gram-positive bacteria. c. high–molecular-weight polysaccharides that coat some bacterial cells and protect the bacteria from attack by cells of the human defense system. d. hairlike, proteinaceous structures that ex-tend from the cell.
Artemia and Fast Plant™ bioassays can be used to identify
a. cytotoxins. b. herbicides. c. plant growth stimulators. d. all of the above.
The _____ is an external genital structure in the male that contains the testes.
A. prostate B. phallus C. scrotum D. fourchette
Parasitic and scavenger fish
A) sharks and rays B) lamprey and hagfish C) bony fish D) coelacanths