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orange: RNA primer; red: RNA template; light blue: proofreading riboexonuclease; mid blue: helicase; dark blue: RNA directed RNA polymerase; violet: non structural proteins (NSPs).
Complex formula of an organic molecule.
Science background with molecule or atom
Abs Virus - 3d rendered image like colorized scanning electron micrograph. Scene showing virus (yellow)  emerging from infected cell.\nConcept of coronavirus that’s causing a global pandemic. Covid-19, Sars-cov-2 alpha, betta, gamma, delta, lambda variant, 2019-nCoV, Coronavirus.\nSEM, TEM, hologram view.
Hyaluronan, hyaluronic acid, HA, hyaluronate molecule, short fragment. Molecular model. 3D rendering. Illustration
A molecular model of Bisphenol A or BPA.  It is a common building block in the production of many epoxy resins and plastics including polycarbonate plastic. As such it is present in a huge range of food packaging and household products. There are now concerns about its health effects, particularly its effect on children, infants and fetuses.   Isolated on white.
Nucleosome structure. Structure of an oligonucleosome, showing the packaging of DNA in chromosomes. 3D illustration.
3d Rendering Molecular Structure,Ozone,Hydrogen and oxygen
From left to right: the NMDA and  AMPA receptors transport calcium cations into neurons after being activated by the neurotransmitter glutamate and  the GABA receptor (right) transport chloride anions after the activation by gamma aminobutyrate. PDB entries: 6wht,  3kg2, 6d6u
DNA and biotechnology concept
Risdiplam drug molecule, 3D illustration. A medication used to treat spinal muscular atrophy, SMA
Chemical formula of Progesterone
Triacetin, glycerin triacetate molecule. It is triglyceride, triester of glycerol, food additive with E number E1518. Molecular model. 3D rendering. 3D illustration
chinese medicine Rhizoma Dioscoreae Septemlobae on black background
Chemical formula of Progesterone. Close-up.
Structural model of Benzene molecule
After dopamine binding, the dopamine receptor changes his shape and binds the inactive G protein.The G protein expels its GDP molecule replacing it by GTP. and falls into two pieces. The Galpha subunit binds to and activates the enzyme adenylyl cyclase, which produces then cyclic AMP spreading a signal through the cell.
A molecular model of the flavonoid Quercetin.  An antioxidant and anti-inflamatory, it is used as a nutritional suplement.  It is commonly found in many fruits and vegetables and is a significant chemical component of tea.  Isolated on white.
3d rendering of benzene molecules conjugated gold (Au) nanoparticles (NPs) on the black background
Chemical formula of Aldosterone
Biological protein and molecule, 3d rendering. 3D illustration.
Molecular model of lactose, a disaccharide sugar in milk.
Cannabidiolic acid or CBDA cannabinoid molecule. 3D rendering. Atoms are represented as spheres with conventional color coding.
Photomicrograph of segmented worm, Aeolosoma hemprichi. Worm is covered with red spots. Lives in ponds. Live specimen. Wet mount, 2.5X objective, transmitted brightfield illumination. Note - motion blur of live animal, very shallow depth of field, chromatic aberration and uneven focus are inherent in light microscopy.
Bacterial multidrug efflux pumps (E-CmeB) expel antibiotics  from inside the bacterium (bottom): ciprofloxacin (yellow), chloramphenicol (violet),  ampicillin (red).
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Calcium carbonate chip in chemical watch glass with molecular structure on white laboratory table. Top view
Chemical formula of Testosterone
3D cartoon and Gaussian surface models, PDB 4bci, white background
Molecular model of Adenosine triphosphate,  or Adenosine-5'-triphosphate (ATP)
Free Images: "bestof:Ergotoxine skeletal.svg ergocristine ergocornine alpha-ergocryptine and beta-ergocryptine the components of ergotoxine own Anypodetos 2012-01-21 File Ergoloid"
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Prerapamycin skeletal.svg
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Carebastine skeletal.svg
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