grade 11 biology revision biomolecule and cell cycle

The curve given below show enzymatic activity with relation to three conditions (pH, temperature and substrate concentration). What do both axes (x and y) represent?

x-axis y-axis

(1)Enzymatic activity Temperature

(2)Enzymatic activity pH

(3)Temperature Enzyme Activity

(4)Substrate concentration Enzymatic Activity

• Option (1)

• Option (2)

• Option (3)

• Option (4)

One strand of DNA has the following sequence of nucleotide 3’ ATTCGCTAT 5’ so the other strand of DNA has

• 5’ TAAGCGATA 3

• 3’ TAAGCGATA 5

• 5’ GACGCGATA 3

• 3’ GACGCGATA 5

Example of a typical homopolysaccharide is

• Lignin

• Suberin

• Inulin

• starch

Enzymes that catalyse inter-conversion of optical, geometrical or positional isomers are

• Ligases

• Lyases

• Hydrolases

• Isomerases

The “Repeating Unit” of glycogen is

• Fructose

• Mannose

• Glucose

• Galactose

Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?

• A : Lecithin - a component of cell membrane

• B : Adenine - a nucleotide that makes up nucleic acids

• A : Triglyceride - major source of energyB : Uracil - a component of DNA

• B : Uracil - a component of DNA

A bivalent of meiosis-I consists of

• a. Two chromatids and one centromere

• . Two chromatids and two centromere

• c. Four chromatids and two centromere

• Four chromatids and four centromere

Which of the events listed below is not observed during mitosis?

• . Chromatin condensation

• Movement of centrioles to opposite poles

• Appearance of chromosomes with two chromatids joined together at the centromere.

• Crossing over

Select the correct statement about G1 phase

• Cell is metabolicaly inactive

• DNA in the cell does not replicate

• It is not a phase of synthesis of macromolecules

• Cell stops growing

How many chromosomes are shown in this picture? How many chromatids?

• 4 chromosomes 4 chromatids

• 4 chromosomes 8 chromatids

• 8chromosomes 4 chromatids

• 8 chromosomes 8 chromatids