____ are multicelled projections that protrude
from the lining of the small intestine.
a. Sphincters
b. Brush borders
c. Microvilli
d. Villi
e. Macrovilli
D
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In the sigmoid growth curve, the carrying capacity of the environment is indicated by what symbol?
A. ri B. N C. K D. dN/dt E. N/K
A transmembrane protein has 1000 amino acids. The fifth amino acid is found on the external surface of the cell membrane. It interacts with the aqueous environment outside the cell
Amino acids 25 and 205 are covalently bonded to each other and are required to give the protein its three-dimensional shape. Amino acid 554 is found on the outer surface of the protein, but it is deep in the interior of the membrane. Amino acid 979 is found on the external surface of the protein, where it forms a weak ionic bond with a chloride ion. Can you identify each of the numbered amino acids by structural group and name? Please note that there may be more than one specific amino acid possible in some cases. Amino acids: 5 25 205 554 979 What will be an ideal response?
Normal flora have beneficial functions in the host. Which of the following is NOT a true beneficial function of these flora?
A. Production of antibiotics to check the growth of any pathogenic bacteria. B. Participation in the metabolism of food products. C. Stimulation of the immune response. D. Protection against infections with highly virulent microorganisms by competing with the latter for food and shelter. E. Provision of essential growth factors, e.g., vitamins
Requirements for X and V factors are used to identify
A) Staphylococcus. B) Escherichia. C) Neisseria. D) Haemophilus. E) Pseudomonas.