Bacterial cell membranes do not have cholesterol. The principal function of the cell membrane is to regulate the substances that enter the cell and the substances that move out of the cell. Cholesterol is a fat like substance that is found in all human cells; it is an important constituent of the cell membrane and it enhances the fluidity of the cell. Bacterial have plasma membrane but the membrane do not contain cholesterol.
Answer:
This scientist has likely discovered a <u>protein</u>.
Explanation:
Proteins are complex molecules composed of monomers known as amino acids. They usually have complex structures that makes them fold. Proteins have several functions but they are essential for body functions because they act as biological catalysts in which they speed up chemical reactions.
Answer:
Collagen fibers provides high tensile strength.
Explanation:
The extracellular matrix of connective tissue has three types of fibers: collagen, elastin and reticular fibers. Collagen fibers are sometimes called white fibers and are strong and resist stretching. These fibers are present in parallel bundles which in turn impart great tensile strength to the connective tissue.
Elastin fibers make a fibrous network in the matrix. Elastin fibers can be stretched up to 1.5 times their original length without breaking and resume the original shape after stretching. This ability of elastin fibers impart elasticity to the connective tissue. Reticular fibers also form the branched network in the extracellular matrix of the connective tissue.
Answer: summation
Explanation:
The process which determine if an action potential will be generated or not depends on the combined effects of the signal inputs from multiple sources of synapse or from the repeated signals from the same synapse.
If the input signals reach the threshold voltage, action potential will be generated. (all –or –none principle).Therefore, this process is a determinant of the likelihood of action potential generation and it is called summation.
Summation is the ability to integrate multiple PSPs at multiple synapses.it is the process that determine if an action potential will be generated by combined effects of inhibitory or excitatory signals.
Based on the pathways and voulme of applied stimuli in the presynaptic neuron;
The signals can be temporal summation ( consecutive signals produced from the same synapse)where action potential of high frequency in the PSN generated action potential in the post synaptic neuron, which summate with one another. Or Spatial where signals inputs are from multiple presynaptic cells.
