In order to ensure that only fully processed mature mRNAs are allowed to be exported to cytosol, pre-mRNAs associated with snRNPs are retained in the nucleus. To demonstrate this, an experiment was performed where a gene coding a pre-mRNA with a single intron was mutated either at the 5’ or 3’ splice sites or both the splice sites.

Given below are a few possible outcomes, Choose NOT FEASIBLE OUTCOME

A. Pre-mRNA having mutation at both the splice sites will be retained in the nucleus because of the presence of bound snRNPs.

B. Pre-mRNA having mutation at both the splice sites will be exported to cytosol because of the absence of bound snRNPs.

C. Pre-mRNA mutated at either 3’ or 5’ splice sites will be retained in the nucleus because of the presence of bound snRNPs.

D. Pre-mRNA mutated at either 3’ or 5’ splice sites will be exported to cytosol because of the absence of bound snRNPs.

#Question id: 11579

#Unit 7. System Physiology – Animal

In response to stress, the adrenal gland promotes the synthesis of glucose from noncarbohydrate substrates via the action of the steroid hormone ________.

#Question id: 11580

#Unit 7. System Physiology – Animal

Melatonin is secreted by the ________.

#Question id: 11581

#Unit 7. System Physiology – Animal

DES is called an "endocrine disrupting chemical" because it interferes with the endocrine secretions of the ________.

#Question id: 11582

#Unit 7. System Physiology – Animal

Following a stressful stimulus, the fight-or-flight response will cause ________.

#Question id: 11583

#Unit 7. System Physiology – Animal

Use the figure to answer the following question.

In an experiment, rats' ovaries were removed immediately after impregnation, and then the rats were divided into two groups. Treatments and results are summarized in the table. The results most likely occurred because progesterone exerts an effect on the ________.

#Question id: 11584

#Unit 7. System Physiology – Animal

Use the bar graph to answer the following question.

People who suffer from chronic fatigue syndrome (CFS) experience ongoing, debilitating fatigue. In one study, cortisol levels in the saliva during the first hour after waking were measured and compared between CFS patients and people without CFS (controls). The data is summarized in the graph. What can you infer from the data?