4 (a) Use words from the box to complete the sentences - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Question 4
4 (a) Use words from the box to complete the sentences.
carbon
chromosome
double
gene
triple
hydrogen
A DNA molecule consists of two coiled strands th... show full transcript
Worked Solution & Example Answer:4 (a) Use words from the box to complete the sentences - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Step 1
Use words from the box to complete the sentences.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A DNA molecule consists of two coiled strands that form a double helix.
The strands are held together by hydrogen bonds between the bases.
A gene is a section of a DNA molecule that codes for a specific protein.
Step 2
Which two scientists were the first to build a 3D model of a DNA molecule?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
James Watson and Francis Crick.
Step 3
Describe how two proteins can be different shaped molecules.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Proteins can have different shapes due to variations in their amino acid sequences. These differences can result in unique folding patterns, leading to a wide range of structural forms and functions in the proteins.
Step 4
Suggest what may have happened to the DNA to cause a protein to form the wrong shape.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Mutations in the DNA sequence can lead to the production of a misfolded protein. This can occur if there is a change in the base pair sequence that results in the incorporation of incorrect amino acids during protein synthesis.
Step 5
Complete the sentence by putting a cross (X) in the box next to your answer.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Enzymes are
A biological catalysts.
Step 6
State the term used to describe organisms that have identical DNA.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
