Biology
Choose the pair of words that best describes where hormones are produced and how they are transported.
a. Brain, nerves
b. Stomach, blood
c. Bones, nerves
d. Glands, blood
Glands, blood
What are the products of the reaction between any acid and any metal carbonate?
a. Salt
b. Salt + water
c. Salt + hydrogen
d. Salt + water + carbon dioxide
d. Salt + water + carbon dioxide
The rate at which an object transfers thermal energy depends on what?
a. Its surface area
b. Its volume and what it is made from
c. The nature of the surface with which it is in contact
d. All of the above
d. All of the above
How do antibiotics work?
a. They absorb the toxins released by the bacteria
b. They kill the viruses that have got into the body
c. They ingest the bacteria that are causing the infection
d. They stop the bacteria from reproducing
d. They stop the bacteria from reproducing
When metals bond with non-metals what happens to their electrons?
a. The metals lose electrons
b. The metals gain electrons
c. The metals share their electrons
d. The metals keep the same number of electrons
a. The metals lose electrons
Why do fossil fuels have a high carbon content?
a. they are made in swamps
b. They are made from organisms that were once alive
c. They are made from limestone
d. They were made in fires started by lightning millions of years ago
b. They are made from organisms that were once alive
Crude oil is a mixture of what?
a. Two or more elements or compounds not chemically combined together
b. Two or more elements or compounds chemically combined together
c. Hydrocarbons combined together with water and gas
d. Mainly alkanes
a. Two or more elements or compounds not chemically combined together
These statements are about the role of enzymes in genetic modification. Which is correct?
a. Ligase enzymes are used to cut DNA in specific places
b. Restriction enymes are used to cut DNA in specific places
c. Restriction enzymes join DNA together
d. None of the statements are correct
Restriction enymes are used to cut DNA in specific places
Group 8 is sometimes numbered as group 0 or group 18. What are the elements of this periodic table group called and why are they unreactive?
a. Noble solids and they have 8 electrons in their outer energy level (shell)
b. Noble liqids and they have 8 electrons in their outer energy level (shell) except helium which has 2
c. Noble gases and they have a complete (full) outer energy level (shell)
d. Noble elements and they have an empty outer energy level (shell)
c. Noble gases and they have a complete (full) outer energy level (shell)
What is a pathogen?
a. Someone who carries out post-mortems
b. A type of infectious disease
c. A microorganism that cause infectious diseases
d. A torch that surgeons wear on their heads during operations
c. A microorganism that cause infectious diseases
What is the compound produced in the test for carbon dioxide?
a. Calcium carbonate
b. Calcium hydroxide
c. Calcium chloride
d. Calcium sulfate
a. Calcium carbonate