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Insulin in Beta Cells

The picture below depicts the events that lead to insulin secretion from pancreatic beta cells.
VDCC

*KATP channel- ATP-sensitive K+ channel; VDCC- voltage-dependent Ca2+ channel

Which of the following statements holds true:

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Special Experiment

An experiment is done using a special chemical that includes methylene blue, a compound that turns blue in the presence of oxygen. Three test tubes containing various plant cells exposed to different levels of light are observed over 3 days. Each day the test tube was placed in a photospectrometer and the light transmittance were recorded in the following table.

Which of the following is a possible explanation for the percent transmittance reported for Plant Cell 2?

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Bobble Wobble

Scientists performed a mutational analysis of gene X. The gene X is a transcription factor involved in the cell cycle control. The aim of the study was to address a question of whether mutations in the gene had an impact on the development of cancer. Overall, five mutations were detected. Analysis of the results showed that some of the mutations had no effect on cancer behavior. The table below contains some basic information about mutations.


Which of the following mutations has/have no effect on cancer development?

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Photo attributed to i eated a cookie.

Gastrin Secretion

Which of the following statements is NOT true regarding gastrin secretion and function?

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Photo attributed to kashyap_hc.

Process of an Action Potential

A neuron communicates by sending an action potential down its axon and releasing neurotransmitter. Which of the following correctly describes the process of an action potential. (1) rapidly enters the cell causing a depolarization, followed by the efflux of (2), which repolarizes the cell. Once the action potential reaches the presynaptic terminal, (3) enters the cell, which causes the release of neurotransmitter?

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Nerve Impulse Propagation

The velocity of nerve impulse propagation could be increased by:

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Photo attributed to Rupesh Nanaiah.