A recessive allele usually results from a mutation that

a. disrupts expression of the gene.

b. alters the structure of the encoded protein leading to gain of function.

c. alters the structure of the encoded protein leading to loss of function.

d. increases the activity of the encoded protein.

#Question id: 260

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is mismatched?

#Question id: 21124

#Unit 12. Applied Biology

#Question id: 4374

#Unit 3. Fundamental Processes

When a repressor protein is __ (bound, unbound) to a promoter region transcription is allowed; when an activator protein is __ (bound, unbound) to a promoter transcription is ,stimulated.

#Question id: 3369

#Unit 11. Evolution and Behavior

Genetic drift refers to random changes in allele frequencies over time leads to following consequence

a. Loss of genetic diversity per generation   

b. change in allelic frequency just by chance 

c. It caused adaptive evolution

d. It one allele may reach to 0 frequency

#Question id: 12001

#Unit 10. Ecological Principles

The  graph  below  shows  the  growth  rates  of  populations  of  bacteria  that  have  evolved  for  many  generations  at different culture temperatures (25°C, 30°C, and 35°C). Each population grows over only a limited range of temperatures (its thermal niche), which are bounded by its critical thermal limits. Within this range, growth rate increases with temperature up to a maximal value and then declines rapidly with increasing temperature. Growth rates are known to be the major determinant of fitness for these bacteria.

Which population has the highest fitness at 25°C ?