I. It was recently discovered that a component that makes up 20% of human breast
ID: 199698 • Letter: I
Question
I. It was recently discovered that a component that makes up 20% of human breast milk cannot be digested by infants. However, a bacteria, Bifidiobacteria longum, is capable of using this component as a nutrient. Futhermore, they found that this strain of bacteria coats the intestine of breast fed infants protecting the infant from noxious bacteria. This would be an example of what type of interaction? a. Parasitism b. Anemalism c. Mutualism d. Commensalism In order to live in aerobic conditions an organism must have which of the following? 2. a. Chlorophyll b. Mitochondria c. Oxygenase d. Superoxide dismutase 3. If the concentration of glucose is higher inside the cell than outside the cell what type of transport must the cell use to bring glucose into the cell? a. Facilitated diffusion b. Endocytosis c. Active transport d. OsmosisExplanation / Answer
1. d. commensalism. It is a type of relationship between two organisms in which one organism derives food or other benefits from another organism without helping or harming it.
2. b. mitochondria (it is the site of oxidative phosphorylation in eukaryotes > aerobic respiration)
3. c. Active transport (it is the transport of substances against concentration gradient i.e., low conc. to high conc. using cellular energy.