Biology Questions and Answers February 03, 2020

We consider a model for tumor cells that are growing around a cylindrical blood vessel of diameter db as shown in the figure below. In this figure P and Q respectively denote the proliferating and the quiescent layer. We suppose that oxygen diffuses into the tumor from the surface of the blood vessel in the radial direction. To simplify the

blood do P Q

Describe the voltage clamp by using a sketch. What is voltage clamping and why is it done? How is it used to investigate voltage-dependent phenomena like the action potential of a neuron? What are the membrane mechanisms (citing evidence) underlying the various "magical" properties of the action potential?

When a plant is placed on a window sill, it grows faster than when it is placed on a coffee table in the middle of the living room. What is the hypothesis and null hypothesis? What are the dependent and independent variables? What is your control? How will you collect your data? How will you present your data (charts, graphs, types)? How will you

Why would it not be good for a bull to produce gelatinout fraction in his semen like the boar and stallion do?