The generally accepted parts of modern cell theory include: All known living things are made up of one or more cells. All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms.
Answer:
It activates Cdc25, which in turn activates more M-Cdk
Explanation:
Cyclin are enzymes that regulate cell cycle progression by the activation of cyclin-dependent kinases (CDKs). These cyclins have no enzymatic activity on their own but they can activate Cdks by binding and phosphorylating them. CDKs can be activated by phosphorylation of activating sites and/or dephosphorylation of inactivation sites. Moreover, M-phase cyclins are cyclins that form M-CDK complexes in order to modulate the cell's entry into mitosis. Cdc25 is a phosphatase involved in the eukaryotic cell cycle which is well-known to regulate the entry into and progression during S (DNA Synthesis) phase and mitosis. In this regard, it has been shown that mitotic phosphorylation of Cdc25 by M-Cdks increases its intrinsic phosphatase activity, thereby Cdc25 is able to remove inhibitory phosphates from M-Cdk and, consequently, activate more M-Cdks.
Answer: The action cytoskeleton structure is dynamic.
Explanation: Actin cytoskeleton is a dynamic structure necessary for cell and tissue organization, including the maintenance of epithelial barriers. The epithelial barriers are necessary to maintain barriers, the disruption of the epithelial barrier coincides with alterations of the actin cytoskeleton in several disease states. Primarily these disruptions affect the paracellular space, that is normally regulated by tight junctions. The actin cytoskeleton is a usual target of bacterial virulence factors. Bacteria secrete and inject toxins and effectors to hijack the host cell machinery, in order to manipulate the action cytoskeleton, which interferes with host-cell pathways and with a number of actin binding proteins.
Lactic acid fermentation is an anaerobic process which serves a variety of functions, including allowing muscles to continue producing ATP from glucose when oxygen levels are low, as with intense exercise, or allowing bacteria such as yeast which only function without oxygen to produce ATP.
The correct answer is A. Two populations of finches that cannot produce viable offspring
Explanation:
Reproductive isolation is a biological and evolutionary phenomenon that prevents two species from successfully reproducing, this means they cannot produce offspring or the offspring is not fertile, even if these species had a common ancestor. Additionally, as a result of reproductive isolation, each species keeps its genes and features. This phenomenon is best exemplified in "Two populations of finches that cannot produce viable offspring " because this refer to the barriers for different species to reproduce or produce viable offspring, which is the focus of reproductive isolation.
