QuestionQuestion

1. What building blocks form a DNA molecule?

A) amino acids

B) nucleotides

C) fatty acid chains

D) polysaccharides


2. Which nitrogenous base pairs with guanine in a DNA molecule?

A) adenine

B) cytosine

C) thymine

D) uracil


3. What molecule would be encoded by a DNA sequence?

A) fat

B) monosaccharide

C) nitrogenous base

D) protein


4. What nitrogenous bases are found in ribonucleic acid (RNA)?

A) adenine, cytosine, guanine, and thymine

B) adenine, cytosine, guanine, and uracil

C) adenine, guanine, thymine, and uracil

D) cytosine, guanine, thymine, and uracil


5. What sequence of molecules are used during protein synthesis?

A) Protein → RNA → DNA

B) RNA → DNA → protein

C) DNA → RNA → protein

D) RNA → protein → DNA




6. Which RNA molecule carries the nucleotide sequence responsible for the amino acid sequence in proteins?

A) transfer RNA

B) ribosomal RNA

C) messenger RNA

D) translator RNA


7. What regulates the rate of production of cellular proteins within each cell?

A) redundancy in the genetic code

B) frameshift mutations

C) gene expression

D) ambiguity in the genetic code

8. Which structure is found in the nucleotides of DNA but not in RNA?

A) a sugar

B) a phosphate group

C) deoxyribose

D) a nitrogen-containing base

9. How does RNA differ from DNA?

A) RNA is contained in the nucleus.

B) RNA doesn't contain a sugar.

C) RNA is single-stranded.

D) RNA takes part in transcription.

10. What DNA nucleotide sequence begins transcription?

A) polymerase

B) palindrome

C) promoter

D) codon

11. Which molecule serves as the template during transcription?

A) DNA

B) mRNA

C) tRNA

D) polymerase

12. Which molecule serves as the template during translation?

A) DNA

B) mRNA

C) tRNA

D) polymerase


13. What structures form the subunits of ribosomes?

A) mRNA and DNA

B) tRNA and mRNA

C) rRNA and proteins

D) DNA and proteins

14. What signal, when present at the ribosome, causes protein synthesis to end?

A) DNA

B) tRNA

C) a stop codon

D) RNA polymerase

15. What type of bond forms between amino acids during translation?

A) hydrogen

B) ionic

C) peptide

D) triple

16. Which amino acid always begins a polypeptide (protein) during translation?

A) valine

B) phenylalanine

C) methionine

D) arginine



17. Which nitrogenous base percentage is complementary to the 33% adenine in a double-stranded DNA molecule?

A) 22% cytosine

B) 33% thymine

C) 66%guanine

D) 77% thymine

18. What DNA sequence is complementary to CGGTGAACTGTA?

A) CGGTGAACTGTA

B) CGGUGAACUGUA

C) GCCACTTGACAT

D) GCCACUUGACAU

19. What sequence of mRNA is made from the gene GCATTACAGGTC?

A) CGTAATGTCCAG

B) CGUAAUGUCCAG

C) GCATTACAGGTC

D) GCAUUACAGGUC

20. What situation results from a frameshift mutation?

A) One or two nucleotides are added or deleted in a DNA strand.

B) Amino acids are assembled into normal, functional proteins.

C) The DNA is always modified in such a way that protein synthesis is prevented.

D) An amino acid is substituted with a similar one that has no effect on protein synthesis.

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1. What building blocks form a DNA molecule?

B) nucleotides

Carbohydrates = polysaccharides or sugars
Lipids = fatty acids
Proteins = amino acids
DNA = nucleic acids / nucleotides

2. Which nitrogenous base pairs with guanine in a DNA molecule?

B) cytosine

Adenine – Thymine
Guanine - Cytosine...

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