Question 1-4 of 8: Growth Yield and Characteristics (Microbial Physiology) | SWAYAM Cell Biology | Includes PYQs | Get Solutions with Detailed Explanations

Growth of an organism was monitored at regular intervals of times and shown in the graph below. Around what time is the rate of growth zero?

The zero growth rate will be observed during

An organism that has peroxidase and superoxide dismutase but lacks catalase is mostly likely an (December)

Major stimulus for spore formation in bacteria is (December)

The following figure represents the growth curve of wild type E. coli grown in a medium containing glucose and lactose

In E. coli the catabolite repression of lactose operon by glucose has been explained by the different levels of cAMP in presence and absence of glucose. This model was challenged and experiments showed that catabolite repression occurred because the activity of lactose permease was inhibited in the presence of glucose. Considering the second model, which one of the following plots correctly represents the growth pattern of a mutant E. coli with a loss of function mutation in the laci gene growing in a medium containing glucose and lactose?

Choices

Choice (4)		Response
a.
b.
c.
d.