Many cells, bacteria, and other microorganisms are transparent to visible light and must be stained for microscopic investigation.

Many of the cells and microorganisms which are transparent to visible light, absorb or reflect the much shorter wavelengths of the ultraviolet spectrum.

Many protists also exist as individual amoeboid cells, or take such a form at some point in their life-cycle.

Many types of specialized plasma membranes can separate cell from external environment: apical, basolateral, presynaptic and postsynaptic ones, membranes of flagella, cilia, microvillus, filopodia and lamellipodia, the sarcolemma of muscle cells, as well as specialized myelin and dendritic spine membranes of neurons.

Many green algae, such as the Dasycladales encase their cells in a secreted skeleton of calcium carbonate.

Many plant cells have walls that are strong enough to withstand the osmotic pressure from the difference in solute concentration between the cell interior and distilled water.

Many cells have only a single mitochondrion, whereas others can contain several thousand mitochondria.

Many neurons have only one axon, but this axon may — and usually will — undergo extensive branching, enabling communication with many target cells.

Many of the features found in human ovaries are common to all vertebrates, including the presence of follicular cells, tunica albuginea, and so on.

Many argue that these are not themselves alive in the traditional sense, but these structures exhibit many of the characteristics of cells accepted as living cells:

Many transcription factors, especially some that are proto-oncogenes or tumor suppressors, help regulate the cell cycle and as such determine how large a cell will get and when it can divide into two daughter cells.

Many neurons in the rat and mouse hippocampus respond as place cells: that is, they fire bursts of action potentials when the animal passes through a specific part of its environment.

Many cells can completely undergo interphase without centrioles.

Many cyanobacteria even display the circadian rhythms that were once thought to exist only in eukaryotic cells ( see bacterial circadian rhythms ).

Many cells also possess a calcium ATPase, which can operate at lower intracellular concentrations of calcium and sets the normal or resting concentration of this important second messenger.

Many lichens reproduce asexually, either by vegetative reproduction or through the dispersal of diaspores containing algal and fungal cells.

Many bacteria can be found deep in the mucus, which is continuously secreted by mucus-secreting cells and removed on the luminal side.

Many starfish also possess individual photoreceptor cells across their bodies and are able to respond to light even when their eyespots are covered.

Many cells bind to components of the extracellular matrix.

Many forms of cutaneous and mucosal allergy are mediated for a large part by mast cells ; they play a central role in asthma, eczema, itch ( from various causes ) and allergic rhinitis and allergic conjunctivitis.

Many cancer cells are considered ' immortal ' because telomerase activity allows them to divide virtually forever, which is why they can form tumors.

Many pre-invasive lesions in cases of squamous cell carcinoma often regress after long-term reduced exposure of the affected cells and tissues to the original environmental carcinogenic stimulus, such as that seen after long-term abstention from tobacco smoking.

Many are asymmetrical, the cells twisting sideways and then untwisting again prior to division, which often takes place within cysts.

Many bacteria, however, possess mechanisms ( such as siderophores ) for scavenging iron within environmental niches in the human body, and experimental developments of iron chelators, therefore, aim to reduce iron availability specifically to bacterial pathogens.

Many larger, pelagic species such as the Mackerel Sharks ( Lamnidae ) and the Thresher Sharks ( Alopiidae ) no longer possess them.

Many types of neuron possess an axon, a protoplasmic protrusion that can extend to distant parts of the body and make thousands of synaptic contacts.

Many adaptor proteins and enzymes activated as part of signal transduction possess specialized protein domains that bind to specific secondary messenger molecules.

Many mammals possess tiny spleen-like structures known as haemal nodes throughout the body, which, it is presumed, have the same function as the spleen proper.

Many crinoids and some seastars exhibit symmetry in multiples of the basic five, with seastars such as Helicoilaster known to possess up to 50 arms, and the sea-lily Comanthina schlegelii boasting 200.

Many nations possess vast stockpiles of weaponized agents in preparation for wartime use.

Many also possess land allotments from Sealaska or from earlier distributions predating ANCSA.

Many fungi thereby possess specialized mechanical and physiological mechanisms as well as spore-surface structures, such as hydrophobins, for spore ejection.

Many women possess such thin, fragile hymens, easily stretched and already perforated at birth, that the hymen can be broken in childhood without the girl even being aware of it, often through athletic activities.

Many higher order organisms possess a chain of 104 amino acids.

Many wetland systems possess biofilters, hydrophytes, and organisms that in addition to nutrient up-take abilities have the capacity to remove toxic substances that have come from pesticides, industrial discharges, and mining activities.

Many plastids, particularly those responsible for photosynthesis, possess numerous internal membrane layers.

Many analog units possess unique characteristics that are desirable.

Many unschoolers disagree that there is a particular body of knowledge that every person, regardless of the life they lead, needs to possess.

Many U. S. states now require passing a high school graduation examination to ensure that students across all ethnic, gender and income groups possess the same skills.

Many minerals, in fact, were thought to possess magical powers, particularly gems.

Many feel that the best low frequency unit for hybrids are cone drivers mounted on open baffles as dipoles transmission line woofers or horns, since they possess roughly the same qualities ( at least in the bass ) as electrostatic speakers, i. e. good transient response, little box coloration, and ( ideally ) flat frequency response.

Many aircraft possess the ability to route signals into the autopilot, allowing the approach to be flown automatically by the autopilot.

Many species possess an oesophagus and stomach, but in some the pharynx opens directly into the intestine.

* Many Indian languages do not natively possess a separate phoneme ( as in RP < trap >).

Many churches possess fragmentary remains that are by tradition alleged to be those of the True Cross.