SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam - SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam

Question 1

Which component of a DNA nucleotide forms the covalent phosphodiester backbone when individual nucleotides are linked together during polymerisation?

The phosphate group of one nucleotide and the 3' hydroxyl group of the adjacent deoxyribose sugar The nitrogenous base of one nucleotide and the nitrogenous base of the adjacent nucleotide The 5' carbon of deoxyribose and the nitrogenous base of the complementary strand The hydrogen bonds formed between complementary adenine and thymine bases

Correct Answer:

The phosphate group of one nucleotide and the 3' hydroxyl group of the adjacent deoxyribose sugar

Question 2

How do DNA and RNA differ structurally and chemically in eukaryotic cells?

DNA contains ribose sugar and uracil, whereas RNA contains deoxyribose sugar and thymine. DNA is double-stranded containing deoxyribose sugar and thymine, whereas RNA is typically single-stranded containing ribose sugar and uracil. DNA contains adenine, cytosine, guanine, and uracil, whereas RNA replaces uracil with thymine. DNA contains 2' hydroxyl groups making it chemically reactive, whereas RNA lacks 2' hydroxyl groups making it highly stable.

Correct Answer:

DNA is double-stranded containing deoxyribose sugar and thymine, whereas RNA is typically single-stranded containing ribose sugar and uracil.

Question 3

Which statement accurately contrasts the organization of hereditary material in prokaryotic organisms with eukaryotic cells?

Prokaryotes possess linear chromosomes bound to histone proteins inside a nuclear membrane, whereas eukaryotes have circular naked DNA. Prokaryotes store genetic material as a single circular chromosome in the nucleoid region and often contain small accessory plasmids, whereas eukaryotes have multiple linear chromosomes wrapped around histones in a membrane-bound nucleus. Prokaryotic DNA contains introns that must be spliced out before translation, whereas eukaryotic DNA consists entirely of continuous protein-coding exons. Prokaryotic chromosomes undergo mitosis during cell division, whereas eukaryotic chromosomes undergo binary fission.

Correct Answer:

Prokaryotes store genetic material as a single circular chromosome in the nucleoid region and often contain small accessory plasmids, whereas eukaryotes have multiple linear chromosomes wrapped around histones in a membrane-bound nucleus.

Question 4

During semi-conservative DNA replication, what is the specific role of the enzyme DNA polymerase III?

Unwinding the double helix by breaking hydrogen bonds between complementary base pairs Synthesising RNA primers required to initiate strand elongation Adding free deoxyribonucleotides complementary to the template strand in a 5' to 3' direction Joining Okazaki fragments on the lagging strand via phosphodiester bonds

Correct Answer:

Adding free deoxyribonucleotides complementary to the template strand in a 5' to 3' direction

Question 5

In Meselson and Stahl's classic experiment, E. coli cultured in 15N (heavy nitrogen) were transferred to 14N (light nitrogen) medium for two generations of cell division. What density gradient band pattern confirms semi-conservative replication after generation 2?

100% heavy (15N/15N) band 50% intermediate hybrid (15N/14N) band and 50% light (14N/14N) band 100% intermediate hybrid (15N/14N) band 75% heavy (15N/15N) band and 25% light (14N/14N) band

Correct Answer:

50% intermediate hybrid (15N/14N) band and 50% light (14N/14N) band

Question 1

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Prepare with the SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam practice quiz. This question bank includes 100 questions covering cell, membrane, eukaryotic, cells, and sequence. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam

This practice set contains 100 questions from the matching question bank and focuses on cell, membrane, eukaryotic, cells, and sequence. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

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SACE Stage 2 Biology Practice Questions - SACE Stage 2 Biology External Assessment Exam

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