BOT Gr 12 Life Sciences Session 1

Which female scientist took X-rays of the DNA molecule and concluded that DNA is helix-shaped?

• Watson

• Franklin

• Crick

• Wilkins

DNA and RNA are examples of...

• amino acids

• enzymes

• nucleic acids

• proteins

The components of a DNA molecule that provide the code for protein synthesis are the...

• sugars

• phosphate

• hydrogen bonds

• nitrogenous bases

A short piece of DNA, containing 19 nucleotides in each strand, was analysed.

The number of some of the different nitrogenous bases in each strand is shown below.

• 8

• 4

• 6

• 2

A DNA template strand codes for the amino acid serine with any of the following base triplets:

 

   AGA AGG AGT TCA TCG AGC

 

            The anticodon that codes for the amino acid serine is …

• AGT

• UGA

• TCG

• UCG

In a car accident, the biological father of a girl and three other men were killed. The men could not be identified due to their injuries. DNA profiling was used to identify the girl's father.

 

The diagram below shows the DNA profiles of the girl, her mother and the four men.

• 4

• 3

• 2

• 1

A gene codes for the production of ...

• a chromosome

• an allele

• DNA

• a protein

A segment of DNA contains:

·                 31% of adenine in strand 1

·                12% of cytosine in strand 2

·                27% of guanine in strand 2

In this segment of DNA, there will also be...

• 31% of adenine in strand 2

• 12% of cytosine in strand 1

• 31% of thymine in strand 2

• 27% of cytosine in strand 2

A pattern of black bars resulting from DNA analysis.

A tangled network of DNA and protein located within the nucleus