STPM Biology 2014 Term 1 MCQ

A nucleoside is composed of sugar, nitrogenous base and ___.

• no phosphate group

• one phosphate group

• two phosphate groups

• three phosphate groups

Maltose is made up of ____.

• glucose and glucose

• glucose and fructose

• glucose and galactose

• galactose and galactose

Keratin in human hair has a high percentage of the amino acid cysteine which is responsible

for the formation of straight or curly hair. Which is involved in the formation of this trait?

• Ionic bond

• Hydrogen bond

• Disulphide bridge

• Hydrophobic interaction

Which property of water enables light weight insects to walk on its surface?

• Bipolar

• Low viscosity

• High adhesion

• High cohesion

Which statement is not true of a prokaryote?

• It has 70S ribosomes.

• It propagates via binary fission.

• Its DNA combines with histone.

• Its genetic material is in the nucleoid.

What is the function of centrioles?

• Breaking down of the nuclear membrane

• Helping in the pairing of homologous chromosomes

• Organising of the microtubules to form spindle fibres

• Holding together the sister chromatids of a chromosome

Which epithelial tissue is found in the intestinal lining?

• Cuboidal

• Columnar

• Simple squamous

• Stratified squamous

The movement of molecules or ions through a membrane against a concentration gradient

is described as _____.

• diffusion

• active transport

• passive transport

• facilitated diffusion

Enzymatic reactions normally have a temperature coefficient (Q₁₀) of 2 in the range of

0°C to about 40 °C. Which statement best describe Q₁₀?

• At 37°C, the Q₁₀ for enzyme-catalysed reactions is approximately 2.

• The temperature 40°C that promotes maximum activity is referred to as the optimum

  temperature of the reaction.

• The change in the rate of a reaction for each 10°C rise in temperature is called the

  temperature coefficient.

• The rate of an enzyme-controlled reactions is doubled for every 10°C rise in

  temperature.

Which statement explains the increase in the rate of reaction at the beginning of an

enzymatic reaction when the substrate concentration is increased?

• More substrates bind to the enzyme.

• The speed of substrate movement increases..

• The active sites of the enzyme are saturated.

• The affinity of the enzyme towards the substrate increases.