Molecular Biology Concepts Assessment

The video tutorial by Mrs. Howo covers genetics, focusing on heredity, DNA structure, chromosomes, and genes. It explains the process of protein synthesis, including transcription and translation, and highlights the importance of proteins in biological functions. The tutorial also touches on genetic variations and their implications.

What is the primary function of DNA in living organisms?

• To protect cells from damage

• To transport nutrients

• To store genetic information

• To provide energy

How many chromosomes do human somatic cells typically contain?

• 23

• 46

• 92

• 69

What is the role of genes in an organism?

• They provide structural support to cells

• They regulate the organism's temperature

• They encode for proteins that determine traits

• They determine the organism's diet

Which type of protein is responsible for catalyzing reactions in the body?

• Receptor proteins

• Enzymes

• Transport proteins

• Structural proteins

What is the first step in the process of transcription?

• mRNA is translated into protein

• Proteins are synthesized

• RNA polymerase binds to DNA

• DNA is replicated

What is the main difference between RNA and DNA?

• RNA is double-stranded, DNA is single-stranded

• RNA contains uracil, DNA contains thymine

• RNA is made of amino acids, DNA is made of nucleotides

• RNA is found in the nucleus, DNA is in the cytoplasm

During translation, what role does tRNA play?

• It catalyzes the formation of peptide bonds

• It forms the structure of ribosomes

• It transcribes DNA into mRNA

• It carries amino acids to the ribosome

What determines the function of a protein?

• The shape of the protein

• The location of the protein in the cell

• The sequence of nucleotides

• The number of amino acids

What happens when a stop codon is reached during translation?

• The tRNA binds to the stop codon

• The amino acid chain is released

• The mRNA is destroyed

• The ribosome starts a new protein

What is the result of a change in the DNA sequence of a gene?

• The organism becomes immune to diseases

• An abnormal protein may be produced

• The gene is deleted from the genome

• A new cell is formed