The thyroid gland secretes thyroxine to control the metabolic rate. Complementary sequence A single-stranded nucleotide sequence that can form base pairs with another single-stranded sequence. Active transport The movement of substances against a concentration gradient using energy. Aerobic bacteria need oxygen, anaerobic bacteria do not.
The size of the pupil can be reduced by the muscles of the iris in bright light, by contracting the radial muscles and relaxing the circular muscle. The Nervous System All living organisms can respond to their environment sensitivity.
During his three years as an undergraduate, Will studied biogeography, which focuses on plant biology at the macro-scale and covers issues, such as plant succession and the impact of fertilisers on the environment.
They can potentially be used to kill pathogenic bacteria. Predators kill and eat other animals called prey. Some organisms may prove to be useful in the future for drugs or breeding. The pleural membrane in the thorax forms an airtight pleural cavity.
Painkillers help relieve pain, but they do not kill microbes. Eventually, the plasma membrane detaches from the cell wall plasmolysis.
Diabetics do not produce enough insulin naturally, and require insulin injections in order to control the level of glucose in their blood.
It is a single-stranded with thymine replaced by uracil. Plants want to avoid losing excess water by transpiration. Some plasmids can integrate into the host chromosome. The testis secretes testosterone in males. In shoots, auxin accumulates on the dark side of the soot.
Microbes, Food and Disease Microbes reproduce quickly when they have sufficient food, water, and the right temperature and pH.
Haploid Having only a single complete set of chromosomes. Motor neurones carry electrical signals from the CNS to the effectors, such as muscles and glands.
The malaria parasite lives in the blood of mosquitoes. The gene is cut open using restriction enzymes and then inserted into the new host organism, then DNA ligase is used to join the DNA back together. Limiting factors Factors which limit the rate of a reaction, e.
Water reaches the leaf cells and evaporates, passing out through the stomata by diffusion.
They change the rate of chemical reactions without being affected themselves at the end of the reaction. Diffusion The net movement of particles of a gas or a solute from an area of high concentration to an area of low concentration along or down a concentration gradient.
Adaptations Special features which make an organism particularly well suited to its habitat.
A recessive allele is only expressed if no dominant allele is present.The ACT is one of the accepted standardized tests required by all the top universities in the USA.
In fact, more students take the ACT each year, even though the SAT has a more recognizable brand and is more popular in the media. Our new AS and A-level English Language and Literature specifications have been designed with a focus on the integration of language and literature, drawing on the academic field of Stylistics in enabling students to explore how linguistic and literary methods are related, and to discover how the use of both will enrich their experience of English.Download