Group+4+Per+2

Rachel & Raquel

Questions 24-28 on Bio midterm.

24. These organisms carry out the activities needed to maintain homeostasis by using specialized internal (2) organelles. Whenever there is a single cell organism, organelles are needed to maintain homeostasis.

25. 1) An enzyme and four different molecules are shown in the diagram below. The enzyme would most likely affect reactions involving (2) Molecule C only Molecule C is the only molecule that fit into the shape.

26. When the antibiotic penicillin was first introduced, it was immediately effective in combating staphylococcus bacteria infections. After a number of years, there were outbreaks of staphylococcal infections that did not respond to treatment with penicillin. The best explanation for this situation is that.... (1) Members of the original population of bacteria that were penicillin resistant survived and reproduced, creating a more resistant population. The other answers did not make any sense. The right answer made sense because if a person is resistant to it, then their offspring would not inherit it.

27. What is an example of a molecule produced by this type of process? (4) Protein. The picture shows amino acids and proteins are associated with amino acids unlike glucose, glycogen, and fatty acids.

28. Molecule X moves across a cell membrane by diffusion. Which row in the chart below best indicates the relationship between the relative concentrations of molecule X and the use of ATP for diffusion? (2) When high concentration moves to low concentration, ATP is not used. ATP is not used only when high concentration moves to low concentration.