A Level Biology - A Random Mix of Challenging MCQ

In relation to the human genome, which of the following is correct?

• The DNA genome is coded by 4 different bases

• The sugar backbone of the DNA strand is formed of glucose

• DNA is found in the nucleus of bacteria

With regards to animal mitochondria, which of the following is correct?

• Mitochondria is NOT necessary for aerobic respiration

• Mitochondria is the sole cause of sperm cell movement

• Mitochondria are more abundant in fat cells than in skeletal muscle

• Mitochondria are enveloped by a double membrane

In bacteria, which of the following is FALSE?

• Bacteria always cause disease

• Bacteria contain plasmid DNA

• Bacteria do not contain mitochondria

• Some bacteria are susceptible to antibiotics

Which of the following is correct regarding active transport?

• ATP is necessary and sufficient for active transport

• ATP is not necessary but sufficient for active transport

• The relative concentrations of the material being transported have little impact on the rate of active transport

• Active transport relies on transport proteins that are powered by an electrochemical gradient

Concerning mammalian reproduction, which of the following is FALSE?

• Fertilisation involves the fusion of two gametes

• Reproduction is sexual and the offspring display genetic variation

• Embryonic growth requires carefully controlled mitosis

• Mammalian gametes are diploid cells produced by meiosis

What is the primary reason that pH is controlled so tightly in humans?

• To allow rapid protein synthesis

• To allow for effective digestion throughout the intestinal tract

• To prevent changes in electrical charge in polypeptide chains

• To prevent changes in core body temperature

Which of the following is the best definition of a mutation?

• A mutation is a permanent change in DNA

• A mutation is a permanent change in DNA that is harmful to an organism

• A mutation is a permanent change to the structure of intra-cellular organelles caused by changes in DNA/RNA

• A mutation is a permanent change in chromosomal structure caused by DNA/RNA changes

Which of the following is the most accurate definition of an antibody?

• An antibody is a molecule that protects red blood cells from changes in pH

• An antibody is a molecule produced only by humans and has a pivotal role in the immune system

• An antibody is a toxin produced by a pathogen to damage the host organism

• An antibody is a molecule that is used by the immune system to identify and neutralise foreign objects and molecules

Which of the following statements is true?

• There is more energy and biomass each time you move up a trophic level

• There is less energy and biomass each time you move up a trophic level

• There is more energy but less biomass each time you move up a trophic level

• There is no difference in the energy or the biomass when you move up a trophic level

The cell membrane:

• Is made up of a phospholipid bilayer which only allows active transport across it

• Is not found in bacteria

• Is a semi-permeable barrier to ions and organic molecules

• Consists purely of enzymes