The Southern Bluefin Tuna lives in the open ocean.
When Legionnaire’s disease was first encountered in the United States the health authorities immediately set about finding the causative pathogen. They examined the lungs of people who had died from the disease, and they discovered a rod-like bacterium in all of them. This bacterium was not present in the lungs of healthy people. They isolated this bacterium and grew it in pure culture. What other step would they need to take before they could be justified in naming this bacterium as the causative pathogen?
Samples of blood were taken from the artery flowing into an organ, and from the vein flowing from it.
Humans and whales differ in their ability to excrete salt in their urine. The table below shows the volume of urine that each would need to produce to excrete the salt in a litre of sea water (35g)
Louis Pasteur performed a famous experiment in which he sterilised the nutrient broth in two swan necked flasks. He then broke the neck off one of them and found that the broth in the broken flask became infected with microbes, but the broth in the other flask remained clear and uninfected.
Who was/were responsible for establishing that the hereditary material is carried on chromosomes?
The diagram below is of a transverse section through a plant stem.
Identify the incorrect statement about the lymphatic system.
Many useful products are obtained from donated blood. Choose the line which correctly matches the products with their uses.
The photograph below is of a fossil trilobite, an extinct invertebrate.
A rise in blood solute concentration, detected by the hypothalamus, would trigger:
Transport of materials through plants occurs in the xylem and phloem. Which one of the following is an example of active transport?
In pea plants, the allele for green pods (G) is dominant over that for yellow pods (g). A plant breeder crosses two pea plants and obtains the following offspring:
The pedigree below shows the inheritance of polycystic kidney disease in a family. The affected gene is carried on chromosome no. 16, and the allele which causes the condition is dominant.
Which one of the following defence adaptations relies upon the release of histamine to stimulate blood flow to the area and encourage flow of fluid from the capillaries into the tissues?