Answer:
Heterotrimeric G protein that separates into α and βγ subunits.
Explanation:
G proteins that activate adenylyl cyclase are trimers of three different subunits. These are named alpha, beta and gamma subunits. The alpha subunit has a nucleotide-binding site called Gs. Binding of GTP to Gs activates it which in turn activates adenylyl cyclase. When the nucleotide-binding site of G-protein is occupied by GDP, it is inactive.
Binding of a signaling molecule such as epinephrine facilitates the displacement of bound GDP by GTP and converting the Gs into its active form. As Gs is activated, the beta and gamma subunits of Gs dissociate from the alpha subunit. The Gs with its alpha subunit and bound GTP then activates adenylyl cyclase.
Explanation:
<em>C.) Stratified squamous epithelium: absorption</em>
Epithelial cells form sheets covering exterior surfaces and internal organs; A many-layered epithelium with cuboidal basal cells and flat cells at its surface would be classified as stratified squamous epithelium.
Tissues composed of multiple squamous cell layers on a basement membrane are called epithelia. These line the skin and internal cavities such as blood vessels, esophagus, and mouth. It protects against bacterial entry, and damage.
The flat basal cells found on the basement membrane divide and differentiate to form cuboidal or columnar cells; these are typically underneath the squamous cells layers and are layered related to their degree of differentiation.
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Answer:
Life cycle of a moss
Explanation:
LIFE CYCLE OF A MOSS FROM MATURED SPOROPHYTE STAGE
An embryo further develops into a pear-shaped sporangium, which is the *sporophyte stage of the plant*. The sporangium contains spore sacs, each of which is the spore mother cell that undergoes meiotic division to form four spores,The spores are released and germination
takes place giving rise to a protonema, which develops into a new gametophyte plant. The gametophyte generation or haploid phase of the moss is from the production of haploid spores after meiosis to the period just before fusion of the haploid antherizoid or haploid ovum. The sporophyte generation or diploid phase is from the diploid mother cells just before meiosis.
Examples of moss plants include Funaria hygrometrica, Polytrichum commune, Barbuda Indica.
Answer:
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
Explanation: