Passage I

Bacteria reproduce by a process in which a single cell divides into two cells. The average time required for bacteria to divide and their population to double is called the generation time. Table 1 presents the generation time for a variety of bacteria at a given temperature.

Bacterial population growth occurs in a series of distinct steps referred to as a bacterial growth curve. It consists of 4 phases, which reflect changes in the cells' environment and metabolism over time. See Figure 1.

1. On the basis of the data presented in Table 1, if Streptococcus lactis was placed in a test tube containing growth medium at 37℃, one would predict its generation time to most likely be:

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Looking at table 1, at 37°C, Streptococcus lactis is placed in two growth mediums of glucose milk and peptone milk respectively, and the generation time is 26 min and 37 min respectively, so the between 25 and 40 min of option D is in line with