B.7.A & B.7.B Genetics Quiz

Which part of a DNA molecule is responsible for the direct coding of specific traits in an

organism?

Tags

B.7.A

Which of the following explain how the nucleotide sequence of DNA determines traits in an organism? (Select all that apply)

• The sequence forms genes, which are instructions for proteins

• The sugar-phosphate backbone codes for physical features

• Proteins built from DNA instructions influence traits

• Mutations in the DNA sequence can change protein structure

• DNA always produces identical traits in all organisms

Tags

B.7.A

Match each term with its role in expressing traits:

• Protein

• Carries amino acids to the ribosome

• tRNA

• Section of DNA that carries a specific code for one protein

• mRNA

• Performs a function that determines a trait

• DNA

• Carries the message from DNA to the ribosome

• Gene

• Contains the instructions for building traits

Tags

B.7.B

What evidence supports the idea that all living organisms share a common ancestor?

• All organisms have different types of nucleotides

• All living things use DNA made of the same four bases

• Only plants and animals use DNA

• Some organisms use RNA instead of DNA

Tags

B.7.A

In your own words, explain why the sequence of nitrogen bases in DNA is more important than just having the bases present.

Tags

B.7.A

A student is examining a diagram that shows DNA being transcribed into RNA. Which conclusion is most accurate?

• The RNA strand is an identical copy of DNA

• Thymine is used in both DNA and RNA

• The RNA carries the code needed to build proteins

• Protein synthesis occurs in the nucleus

Tags

B.7.B

Place the steps of protein synthesis in the correct order:

• Ribosome reads mRNA

• DNA is transcribed into mRNA

• mRNA leaves the nucleus to the ribosome

• Amino acids are linked into a chain

Tags

B.7.B

Explain how a single gene can influence a physical trait like hair color.

• The gene causes cells to divide, which increases pigment production.

• The gene is made of enzymes that directly change an organism’s traits.

• The gene contains a code that tells the cell which protein to make, and the protein affects the trait.

• The gene determines how fast DNA replicates, which controls physical appearance.

Tags

B.7.A

A virus infects a host cell and uses its machinery to replicate. What evidence best supports the claim that viruses are not living organisms?

• They contain DNA/ RNA and proteins

• They reproduce without help of other cells

• They cannot make energy or reproduce on their own

• They are significantly smaller than cells

Tags

B.5.D

Eight components present in nucleic acids are listed in the box. Which components bond with adenine in a section of double-stranded DNA?

• 1, 3, 5, and 6 only

• 3 and 5 only

• 2 and 4 only

• 3, 4, 7, and 8 only

• 1, 3, and 4 only

Tags

B.7.A