Experimental research involves manipulating one or more variables and measuring their effect on a dependent variable. This type of research is often used to test hypotheses and determine cause and effect relationships. There are a wide variety of experimental research topics that can be studied, ranging from the social sciences to the natural sciences. Here are a few examples:
The effects of social media use on depression: In this study, researchers might manipulate the amount of time an individual spends on social media and measure the effect on their depression levels.
The impact of exercise on memory: This study could involve manipulating the amount of exercise an individual gets and measuring the impact on their memory.
The influence of sleep deprivation on cognitive performance: Researchers could manipulate the amount of sleep an individual gets and measure the effect on their cognitive performance, such as reaction time and decision-making ability.
The effects of different teaching methods on student learning: In this study, researchers could manipulate the type of teaching method (e.g., traditional lecturing vs. hands-on learning) and measure the effect on student learning and retention.
The impact of diet on weight loss: Researchers could manipulate the type of diet an individual follows (e.g., low-fat vs. low-carb) and measure the effect on weight loss.
These are just a few examples of the many experimental research topics that could be studied. It is important for researchers to carefully design their experiments, control for extraneous variables, and use appropriate statistical analyses in order to draw accurate conclusions from their data.
DP Biology: Option D
All vertebrate embryos go through a stage in which they have gill pouches on the sides of their throats. The simulated environment produced many types of amino acids and other organic molecules leading them to conclude the prebiotic synthesis of organic molecules was possible. To form life they need to compartmentalise themselves from the surrounding water. Therefore elephants separated as a species from a common ancestor with humans longer ago then did gorillas. If you are not born with genes programming for certain characteristics, you cannot pass down characteristics acquired during your lifetime as these characteristics do not reach sex cells.
This is why marsupials and monotremes are now found only on Australia. The expected frequency of the heterozygous genotype is 2pq. They have evolved for different functions but the relationships between the bones in the limb are all remarkably similar. This is supported by the fact that RNA plays an important role in genetic control in cell life today. Thus, the adaptation of a bipedal human. After 1960 as smog levels decreased the proportion of black ladybugs decreased proportionally and both smog and black butterflies reached constant low levels from 1980.
IB biology practice questions (option D) Flashcards
A succession of fossils from the horse ancestor with four toes to a modern horse with one toe shows a trend towards reduced number of toes. These individuals will be more likely to live long enough to reproduce and pass on their well-suited genes. This suggests that all life forms had a common ancestor which did the same. The theory could be tested in the future by looking for life similar to our own beyond Earth but space travel is not yet sufficiently developed. In populations exposed to malaria it will increase in the population until the homozygous recessive form becomes too common.
Error of less than 10%. Thus RNA could be replicated and passed on. The depletion of forests encouraged a ground-adapted species that could move on land for long distances and who could carry scattered food. PKU is a genetic disease; the allele causing it is recessive. Darwin explained all his observations and thoughts about the origin of species by the concept of "natural selection". Example: if you cut off the tails of mice, their offspring will still have tails. Early polymerization reactions must have occurred without the help of enzymes.
Not significant in evolution as all are sterile. They have a common gene pool and are reproductively isolated from other such groups. Since then cultural evolution has been able to change humans far more quickly than genetic evolution has. In 1982-3 there was an el Niño event which brought much rain and meant that the vegetation changed and over the next 5 years there were far more soft small fruits. The endosymbiotic theory focuses on the origins of chloroplasts and mitochondria.
The present continents are attached to plates of crust that float on the mantle. MUCUS protects the stomach lining, prevents self digestion of the stomach WATER BREAKS DOWN PROTEIN INTO POLYPEPTIDES - digestive juices are produced in the exocrine gland that are in the mouth salivary glands , in the stomach wall gastric glands and the walls of the pancreas. Short strands of RNA, perhaps most importantly the RNA called ribozymes, could have copied themselves and could have catalysed other reactions. This may be very crucial to the origin of RNA and DNA and therefore for the beginning of life. For example, the haemoglobin of gorillas only differs by one amino acid from human haemoglobin whereas elephant haemoglobin differs from human haemoglobin by 26 amino acids. Information like this can help to group organisms in trees of descent and suggest how long ago they had a common gene pool.
DNA Match two single stranded DNA from different species and see how tightly the DNA from one species can bind to DNA from another species. These observations and other similar examples are expected under the theory of evolution. If the isotopes are unstable, they will lose protons and break down over time. The black absorbs more light, and so the black ones have an advantage staying warm when sunlight levels are low. It lived in water. The tighter the bond the greater the similarity and the more closely related the species. Half life is the amount of time it takes for half of a sample of a certain substance to break down.
Minerals also leach into the soft parts of the organism, leaving a petrified cast of its shape within the rock. Since each radioactive isotope has a fixed half-life it can be used to date fossils based on the relative concentrations of the reactant and product of the decay. Volcanic eruptions and meteor impacts and climate changes speed up evolution at certain times as they create rapid changes in the environment which require rapid adaptation to survive. I will post resources here for the options that we study in BIS. The three southern continents have been far more isolated from one another and show far greater variety of mammal life. There is no real scientific evidence for this theory other than a lack of evidence for alternate theories. Their genotype was homozygous recessive tt.