…in the beginning there was chaos from which evolved order

[The Leaven – exploring the relationship between science and religion (cont)]

The application of molecular archaeology has largely denounced the explanation of creation as proposed by Babylonian type theories recorded in the Old Testament. Several views held at this time have been dispelled by Science. For instance, rain was thought to fall from seas separated from the Earth by a dome structure which the Creator called sky [Gen. 1, 6-7].

Then God commanded, “let there be a dome to divide the water and keep it in two separate places”- and it was done. So God made a dome, and it separated the water under it from the water above it. He named the dome “sky”.

Birds and fish were created on the fourth day, while animal life on Earth was created on the fifth. On the sixth day the Creator placed humans on Earth to control the animals that existed in the land and sea. The order in which the animals appear seems to be fairly logical, fish and birds being further down the food chain than the higher animals with humans at the very top. There is no mention of bacteria and parasites. Evolutionary speaking they should appear before the birds and fish in day three.

So God made a dome, and it separated the water under it from the water above it. He named the dome “sky”. Woodcut by Julius Schnorr von Carolsfeld 1860

Theories involving the spontaneous generation of living beings were widely accepted for centuries. The Greek philosophers Plato and Aristotle in the 4th Century BC held views that contradicted a gradual evolution of life forms. Plato argued that there were two worlds: one was real the other was imaginary. The variations that were present in plants and animals were merely imperfect illusions of an already perfect form. This philosophy was known as idealism or essentialism and ruled out evolution as organisms were already in the form that they were destined to become. Aristotle recognised that organisms could be arranged according to complexity this is often referred to as a scale of nature or scala naturae. He believed that there was an organism at each scale; species were fixed and no evolution occurred. This view persisted for 2000 years and was widely adopted by natural theologists who thought that the Creator had designed each species for a specific purpose.

Linnaeus in the 18th century adopted a filing system for all these species. He was a natural theologian who claimed that he had developed the classification system in order to reveal Gods plan, he clarifies this using the phrase:

Deus creavit, Linnaeus disposuit; God creates, Linnaeus arranges.

During the nineteenth century yeasts were thought to be part of the plant kingdom in the division of Thallophyta because they lacked true roots, stems and leaves. They were eventually classified as fungi because they do not contain chlorophyll or rely on photosynthesis to create energy. Instead they live a parasitic or saprophytic existence, living off the carbon sources supplied by other organisms. Like other species of fungi, yeast can also form spores. In the case of S. cerevisiae these are found in a sac called an ascus this has earned them the further classification of Ascomycetes.

Jean Baptiste Lamarck was one of the first biologists who proposed a theory of evolution in 1809. As curator of the invertebrate collection in the Natural History Museum in Paris, he observed that insects changed gradually over the centuries. He thought that microscopic creatures were at the bottom of evolution and generated spontaneously from inanimate material. Lamarck felt that creatures evolved towards greater complexity and that higher organisms were aiming towards perfection to become completely adapted to their environment. He proposed that organisms adapted continually thereby some aspects of their physiology grew stronger while others disappeared and that these life-time improvements could be passed on to their offspring. Lamarck’s hypotheses have been largely disproved but his views were revolutionary; he implied that species evolved and that they were not fixed. Darwin’s theory of natural selection was to directly challenge the current viewpoint of fixed design. Natural, or should it be supernatural, theology, was the accepted way of thinking and doing science, each species being allocated a specific niche by a supernatural being.

At an early age Darwin was already a keen naturalist and obtained a degree in theology at Christ College Cambridge where he became the protégé of the botanist Professor Henslow. When he was 22 he joined the crew of The Beagle, a survey ship whose mission was to chart the South American coastline. During this voyage he collected flora and fauna while others surveyed the coast. He was particularly interested in the diversity of species that were present in the Galapagos Islands and recovered over a dozen different types of Finch. Darwin began to understand through his own work, and that of others, that the origin of new species arose from a distant ancestor by the gradual accumulation of adaptations. He saw this within the beaks of the finches that he had collected from the Galapagos Islands. Each Finch had a specialised beak that was adapted to forage for the type of food found on its island of origin. This was visible evidence that selection through environmental factors could contribute to speciation.

Darwin’s drawings of beak variation in Finch species.

Darwin was reluctant to introduce his theories publicly because, being a theologian, he was aware of the controversy that this would cause. He wrote an essay on the origin of species in 1844 that remained unpublished until 1858 when extracts from it were presented to the Linnaean Society. In the same year another naturalist, Alfred Wallace published a paper on the evolution of new species. This prompted Darwin to complete his book the Origin of Species, which was published the following year. The Origin of Species presented a strong argument for natural selection through scientific evidence and became adopted by evolutionists as the primary text on the subject. At the time molecular genetics and the true nature of genetic inheritance were still undiscovered so Darwin adopted a Lamarckian approach to explain acquired characteristics. Where strengths acquired during the course of a life-time could be passed down to the next generation.

Knead me not into temptation

[The Leaven – exploring the relationship between science and religion (cont)]

Like other simple life forms, yeasts such as Saccharomyces cerevisiae are fully self-contained within one microscopic cell. S. cerevisiae cells are round and, providing they are well nourished with carbohydrates, spend most of their life-cycle reproducing vegetatively by growing buds. Buds separate from the parental cell when they reach a certain size in order to follow an individual pattern of growth. Upon maturity these too can start budding; each cell produces about thirty progeny. The loss of the bud leaves a scar on the parental cell that can be visualised with fluorescent dyes or electron microscopic techniques. The pattern and number of scars can reveal a lot about the condition and age of the yeast cell. Some yeasts do not reproduce by budding but by forming a cross-wall rather like the mitotic cell division observed in higher eukaryotes. Schizosaccharomyces pombe or fission yeast is an example of this. It divides in a similar way to human cells and therefore is used as a model system to study many human diseases, especially cancer.

Yeast cells stained with calcofluor white dye and observed under a fluorescent microscope. Newly budded cells take up less dye. Small rings on cell surfaces are budding scars. Image:bio+ve

The concept that living organisms produced leaven wasn’t seriously considered until Erxleben, in 1818, proposed that leaven and barm consisted of living vegetative organisms responsible for fermentation. Prior to this, in 1680, Leeuwenhoek, with his early microscope, observed yeast cells in fermenting beer. He referred to most of these single-celled creatures as animalcules because they were believed to be immature forms of larger animals. These first observations of microscopic cells were not further investigated for another century. Leeuwenhoek’s contemporaries were largely preoccupied with the argument centred on spontaneous generation, a belief that animals could materialise from other living or mineral things. Before groundbreaking experiments by Louis Pasteur in the mid 19th Century, which illustrated that excluding particles from sterile broth prevented contamination by microbes, many theorists believed in spontaneous generation.

Different theories and speculations concerning the creation of organic things occur in every religion, as most feel that the complexity of the natural world could not have arisen by chance. Many investigators began to challenge the image of creation as depicted in the Bible. Perhaps the most compelling of these arguments was the theory of natural selection presented by Charles Darwin in the mid 19th Century. His book entitled the Origin of Species created tensions between the Church and Science because it questioned a popular and largely excepted image of creation.

Religious devotees perhaps saw Science as being not only a threat to their faith but to their social acceptance and respect. Science innovation threatened to ridicule the basis of their fundamental beliefs and values. It is therefore understandable that there was a need to retain Biblical teachings in some form. In the 19th Century, the paradigm shift that was rapidly evolving Science was too extreme to evoke an equally rapid change in religious faith. In order to fully commit to a belief requires a great deal of conviction. This conviction can be impenetrable leading believers to imagine that an evil being is responsible for any deviancy from a steadfast commitment. Any element of uncertainty in religious belief seems to lead to the evolution of new religious theories to give meaning to situations that are too difficult to comprehend. In the New Testament an interesting method is used to quell sceptics and doubting critics. Individuals who questioned the ideals proposed by Jesus were thought to be influenced by the Devil:

Jesus is tempted by the Devil. Mosaic from Monreale Cathedral. Image by Sibeaster

After spending forty days and nights without food, Jesus was hungry. Then the devil came to him and said, “If you are God’s Son, order these stones to turn into bread.”
But Jesus answered, “The scripture, says, Man cannot live on bread alone, but needs every word that God speaks.”
[Matt. 4.1-11; MK. 1.12-13; Lk. 4.1-13]

This  not only discourages doubt from those with religious faith but also prevents others from persuading them away from their convictions. It is not surprising that scientific hypotheses that question religious beliefs are subject to contention.