Welcome to your AQA A2 Biology 1 Which of the following does not affect the growth of soil micro organisms? Gases such as Helium Porosity of the soil Water Amount of mineralsWhich of the following does not occur when the blood glucose level rises? Glycogen is converted into glucose. Beta cells of islets of langerhans secrete insulin. Secretion of glucagon from alpha cells is reduced. Permeability of body tissues such as liver, muscle and fat cells for glucose is increased.Specialized sensory neurones in the hypothalamus to monitor the water potential of blood. Mechanoreceptors Osmoreceptors Stretch receptors ThermoreceptorsWhich of the following factor is not regulated by the kidney? Blood oxygen level Osmotic pressure of blood Blood pH value Blood pressureSelect the incorrect statement regarding diabetes. The symptoms of both types of diabetes mellitus are different. Type2 diabetes begins relatively late in life. People with type1 diabetes receive regular injections of insulin. People with type2 diabetes rarely need to have insulin injections.Which is not a feature of receptors? They contain sensitive receptor cells which respond to a minimum threshold level. They are designed to receive a specific stimulus. They act as transducers. They do not contain special types of cells.Select the correct statement regarding cones. They contain rhodopsin. Cones are important for daytime vision. They are sensitive to low light intensities. They are cylindrical cells.A group of specialized cells which can detect chnages in the environment called stimuli. Spinal cord Effectors Receptors NeurotransmittersWhat type of GLUT transporter is found in muscle cells? GLUT4 GLUT2 GLUT3 GLUT1What type of GLUT transporter is found in brain cells? GLUT2 GLUT1 GLUT4 GLUT5Which of the following does not respond to changes in temperature? Krause end bulbs Pacinian corpuscle Free nerve ends Ruffini corpusclesWhat is the role of enzyme glucokinase? Coversion of proteins into amino acids. Digestion of lipids. Converts glucose into glycogen. Phosphorylation of glucose.Select the incorrect statement regarding alleles. The alleles could be homozygous or heterozygous in a haploid organism. There may be many alleles of a single gene. The inheritance of alleles and their dominance could be represented in a punnett square. Alleles could be dominant, recessive or codominant.Which of the following is not an example of an effector in action? A muscle squeezing saliva from the salivary gland. An injury due to an accidental fall. A muscle contracting to move the arm. A gland releasing a hormone into the blood.Select the incorrect sentence out of the following. Soil contains only 2 types of micro organisms. Most plants obtain their essential minerals from the soil. Soil micro organisms play an important role in releasing nutrients. Cyanobacteria is a micro organism present in the soil.The process where dead plant and animal matter is being converted into fine brown particles by soil micro organisms. Formation of humus Mineralization Carbon fixation Nitrogen fixationWhich is not a role of soil micro organisms in relation to the growth of plants? Help in absorption of nutrients Fixation of Potassium Fixation of nitrogen Formation of soil aggregationWhich is not a physiological response for decreased environmental temperature? Decreased production of sweat. Huddling together around a campfire. Increased secretion of adrenaline. VasoconstrictionWhy is adrenaline secreted when the environmenatl temperature is low? To increase the rate of heat production in the liver. To decrease the production of sweat. To increase the blood flow throughout the body. To decrease the rate of heat production in the liver.Select the incorrect statement regarding the Nitrogen cycle. Atmospheric nitrogen fixation takes place in 2 major ways. Biological fixation of atmospheric nitrogen is performed by 2 ways. Soil receives nitric acid from biological fixation. Nitrogen gas reacts with water in the rain due to lightening.