Which organelle, A to D, is not involved in the production and secretion of enzymes in eukaryotes?
A Golgi apparatus
B ribosomes
C smooth
... [Show More] endoplasmic reticulum
D vesicle - CORRECT ANSWERS -C- smooth endoplasmic recticulum
A student designed an investigation into the rate of transpiration in plants. They used eight leaves of the same size, age and species. They kept environmental conditions such as wind speed, temperature and humidity constant. Why did the student take readings from eight different leaves?
A to make their investigation valid
B to increase the accuracy of their readings
C to assess the repeatability of their data
D to improve the precision of their results - CORRECT ANSWERS -C- to assess the repeatability of their data
Name the bond that holds the α-glucose and the fructose together.
A 1,6-glycosidic bond
B phosphodiester bond
C ester bond
D 1,4-glycosidic bond - CORRECT ANSWERS -A 1,6-glycosidic bond
The substances shown in the graph are: carbon dioxide, testosterone (a lipid-based hormone), ethanol and sodium ions. Which of the lines, A to D, represents the pattern of movement of sodium ions across a membrane? - CORRECT ANSWERS -D
The aquatic crustacean Daphnia magna has a heart that pumps a blood-like liquid called haemolymph around the body cavity. Which of the statements, A to D, describes the circulatory system of Daphnia magna?
A single closed
B single open
C double open
D double closed - CORRECT ANSWERS -B- single open
DNA polymerase catalyzes the formation of phosphodiester bonds during DNA replication. Which of the statements, A to D, will not affect the rate of phosphodiester bond formation?
A temperature
B length of DNA molecule
C pH
D free nucleotide availability - CORRECT ANSWERS -B- length of DNA molecule
Which of the following, A to D, is not an adaptation to reduce water loss in plants?
A an extensive root system that extends far from the plant
B leaves that are reduced to spines that prevent damage from animals
C the ability to store carbon dioxide so stomata only need to open at night
D the surface covered in reflective hairs - CORRECT ANSWERS -A an extensive root system that extends far from the plant
The hydroxyl (-OH) group of carbohydrates is polar and makes the molecule soluble in water. The greater the number of free hydroxyl groups as a proportion of the number of carbon atoms, the more soluble the carbohydrate. Which of the rows, A to D, lists the carbohydrates in order of most soluble to least soluble?
A glucose ribose amylose amylopectin
B amylose amylopectin glycogen ribose
C glucose ribose amylopectin amylose
D ribose amylose glucose amylopectin - CORRECT ANSWERS -A glucose ribose amylose amylopectin
Carbon dioxide release during respiration can affect the % oxygen saturation of haemoglobin. The tertiary structure of haemoglobin is affected when carbon dioxide reacts with water to form carbonic acid. This reaction releases hydrogen ions. Which of the statements, A to D, explains this change?
A The release of hydrogen ions causes the pH to rise, which reduces haemoglobin's affinity for oxygen.
B The release of hydrogen ions causes the pH to rise, which increases haemoglobin's affinity for oxygen.
C The release of hydrogen ions causes the pH to fall, which increases haemoglobin's affinity for oxygen.
D The release of hydrogen ions causes the pH to fall, which reduces haemoglobin's affinity for oxygen - CORRECT ANSWERS -D The release of hydrogen ions causes the pH to fall, which reduces hemog [Show Less]