Biology

Pre-Lab Questions 1. What determines if a bacterial cell is Gram-positive or Gram-negative? (5 points) Amount and location of the peptidoglycan molecule in the prokaryotic cell wall determines whether a bacterial cell is Gram-positive or Gram-negative.   2. In this lab, both viruses and prions were introduced as acellular organisms. Do some research and describe […]

Pre-Lab Questions 1. What determines if a bacterial cell is Gram-positive or Gram-negative? (5 points) Amount and location of the peptidoglycan molecule in the prokaryotic cell wall determines whether a bacterial cell is Gram-positive or Gram-negative.   2. In this lab, both viruses and prions were introduced as acellular organisms. Do some research and describe

Structure and Microscopy     Lab 4: Structure and Microscopy (100 points)   Student Name: Student ID: Course ID: -Each question on the lab worksheet must be answered completely, thoroughly, in complete sentences and correctly in order to be considered for full credit -If the question asks you to do research or find a source,

NEGATIVE STAINING Negative staining provides a more detailed assessment of a microbe’s morphology and helps prevent any distortion of the mi- crobe’s ultrastructure by the staining procedure. It also makes the outline of the cells highly visible. Nigrosin and bacterial cells are negatively charged. Therefore, negative staining works because like charges repel each other, preventing

What type of graph would be appropriate for this data set? Why? A line graph is most appropriate because it can best display the relationship between the variables.   7. Graph the data from Table 4: Water Quality vs. Fish Population (found at the beginning of this exercise). 18   8. Interpret the data from

What would be your control? Possible Control: Aquarium with no fish. Measure the dissolved oxygen level in a fish tank at normal room conditions, and repeat this measurement every time you make an observation of the number of fish. [Use only one type of fish for your experiment, and control other variables such as light,

What are the independent and dependent variables? Independent Variable: Dissolved oxygen concentration. Place Your Order Here!

What would your experimental approach be to test this hypothesis? Possible Experimental Approach: Deposit an equal number of fish in several tanks. Maintain all other variables (temperature, light, food, etc.), but vary the dissolved oxygen concentration in each of the tanks. Observe the fish over time to determine how many fish can survive at different

Exercise 1: Data Interpretation (2 pts each) 1. What patterns do you observe based on the information in Table 4? No fish are present when the dissolved oxygen is zero. When there is more dissolved oxygen in the water, more fish are present. However, the number of fish tends to drop or level off when

Data Interpretation  Exercise 1: Data Interpretation (2 pts each) 1. What patterns do you observe based on the information in Table 4? No fish are present when the dissolved oxygen is zero. When there is more dissolved oxygen in the water, more fish are present. However, the number of fish tends to drop or level