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Free Practice Questions for BAC Plant and Animal Biology

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Sample BAC Plant and Animal Biology Practice Questions

Try these sample questions to review concepts for the BAC Plant and Animal Biology exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following cellular structures is present in prokaryotic bacterial cells?
A.70S ribosomes suspended in the cytoplasm
B.Membrane-bound nucleus enclosed by a karyotheca
C.Mitochondria with folded inner cristae
D.Endoplasmic reticulum with cisternae
Explanation: Bacterial prokaryotic cells lack membrane-bound organelles such as a true nucleus, mitochondria, and endoplasmic reticulum. However, they contain 70S ribosomes (composed of 50S and 30S subunits) suspended in the cytoplasm for protein synthesis. Eukaryotic cells possess larger 80S ribosomes in their cytoplasm.
2In prokaryotic cells such as eubacteria, where is the primary genomic DNA localized?
A.Inside a double-membrane karyotheca with nuclear pores
B.Within an unenclosed cytoplasmic region termed the nucleoid
C.Confined strictly within the matrix of mitochondria
D.Sequestered inside the cisternae of the Golgi complex
Explanation: The nucleoid is the unenclosed region containing the bacterial chromosome. Many bacteria have a circular chromosome, although linear chromosomes and multiple chromosomes also occur. Plasmids are additional DNA molecules distinct from the main chromosome.
3In an aerobic bacterium, which structure contains the respiratory electron-transport chain?
A.The external polysaccharide capsule
B.The peptidoglycan cell wall
C.The plasma membrane
D.The nucleoid DNA
Explanation: Aerobic bacteria carry respiratory electron-transport proteins in their plasma membrane. They lack mitochondria. Structures historically called mesosomes were shown to arise during specimen preparation and should not be taught as normal respiratory organelles.
4What is the primary biochemical constituent of the cell wall in plant cells?
A.Chitin polymers
B.Peptidoglycan murein
C.Glycogen granules
D.Cellulose microfibrils
Explanation: Plant cell walls are primarily composed of cellulose microfibrils embedded in a matrix of hemicellulose and pectin. Cellulose provides structural rigidity, tensile strength, and osmotic protection to plant cells. In contrast, fungal cell walls contain chitin and bacterial cell walls contain peptidoglycan (murein).
5According to the fluid mosaic model (modelul mozaicului fluid), the plasma membrane is primarily structured as:
A.A rigid single layer of carbohydrates supported by external cellulose fibers
B.A phospholipid bilayer with intercalated and surface-associated proteins
C.A solid triple layer of cholesterol impermeable to small nonpolar molecules
D.A continuous sheet of glycoproteins devoid of mobile lipid constituents
Explanation: The fluid mosaic model, proposed by Singer and Nicolson, describes the plasma membrane as a dynamic phospholipid bilayer with hydrophilic heads facing aqueous environments and hydrophobic tails facing inward. Integral and peripheral proteins are embedded or associated with this fluid lipid bilayer, allowing lateral mobility and selective transport.
6Which eukaryotic organelle is known as the cellular powerhouse due to its role in ATP synthesis via oxidative phosphorylation?
A.Endoplasmic reticulum
B.Ribosome
C.Mitochondrion
D.Lysosome
Explanation: Mitochondria are double-membraned semi-autonomous organelles responsible for cellular aerobic respiration. They generate the majority of cellular adenosine triphosphate (ATP) through the Krebs cycle in the matrix and oxidative phosphorylation along the inner mitochondrial cristae.
7The internal folded membrane structures inside a mitochondrion that bear ATP synthase complexes are termed:
A.Thylakoids
B.Granum stacks
C.Cisternae
D.Cristae
Explanation: The inner mitochondrial membrane is extensively folded into shelves or tubules called cristae (creste mitocondriale). These folds dramatically expand the surface area available for the electron transport chain complexes and ATP synthase enzymes required for cellular respiration.
8Which plastids contain carotenoid pigments that confer yellow, orange, and red coloration to flowers and ripe fruits?
A.Chromoplasts
B.Chloroplasts
C.Leucoplasts
D.Amyloplasts
Explanation: Chromoplasts (cromoplaste) are colored plastids that synthesize and store lipid-soluble carotenoids (such as carotene and lycopene). They give bright yellow, orange, and red colors to petals, ripe fruits (e.g., tomatoes and peppers), and certain roots (e.g., carrots), attracting animal pollinators and seed dispersers.
9In chloroplasts, the light-dependent reactions of photosynthesis take place specifically within the:
A.Stroma matrix
B.Outer chloroplast envelope
C.Thylakoid membranes
D.Intermembrane space
Explanation: The light-dependent reactions of photosynthesis occur within the thylakoid membranes (membranele tilacoidale), which contain photosystems I and II, photosynthetic electron transport carriers, and ATP synthases. In contrast, the light-independent reactions (Calvin cycle) take place in the soluble fluid matrix called the stroma.
10What is the primary function of the rough endoplasmic reticulum (reticul endoplasmatic rugos)?
A.Lipid synthesis and steroid hormone production
B.Hydrolytic digestion of damaged cellular organelles
C.Fixation of inorganic carbon dioxide into organic compounds
D.Synthesis, folding, and processing of proteins destined for membranes or secretion
Explanation: The rough endoplasmic reticulum (RER) is studded with 80S ribosomes on its cytosolic surface. It synthesizes polypeptides that enter its lumen for folding, post-translational modifications (such as N-glycosylation), and sorting into transport vesicles destined for the Golgi apparatus, lysosomes, or the plasma membrane.

About the BAC Plant and Animal Biology Exam

Independent practice for Examenul Național de Bacalaureat, Biologie vegetală și animală (Proba E.d). Independent English-language MCQ study adaptation. It is not an official translation, an official-format simulation, or a substitute for Romanian-language reading and writing, full worked solutions, or oral and practical preparation. Romanian is confirmed. Candidates who studied a subject in a minority language may request that language under the methodology; availability depends on the subject and route. Practise diagrams, genetic crosses and written explanations of life functions.

Exam sponsor: Ministerul Educației și Cercetării / Centrul Național pentru Curriculum și Evaluare (CNCE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

180 minutes (3 hours)

Passing Score

At least 5/10 in every written paper and an overall written mean of at least 6/10, with required competence assessments completed or recognised. The methodology rounds an overall 5.99 to 6.00.

Exam / Certification Fees

First two Bacalaureat presentations are free; later presentations carry an annually set fee. A current later-attempt amount is not confirmed here.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not officially weighted here

Cells and diversity

Cell structure, tissues, classification and biological diversity.

Not officially weighted here

Life functions

Nutrition, respiration, circulation, excretion, relations and reproduction.

Not officially weighted here

Heredity

Cell division, Mendelian inheritance and genetic problems.

Preparing for the BAC Plant and Animal Biology Exam

What You Need to Know

  • Passing score: At least 5/10 in every written paper and an overall written mean of at least 6/10, with required competence assessments completed or recognised. The methodology rounds an overall 5.99 to 6.00.
  • Assessment: Question count not published by the exam provider
  • Time limit: 180 minutes (3 hours)
  • Exam / certification fees: First two Bacalaureat presentations are free; later presentations carry an annually set fee. A current later-attempt amount is not confirmed here. Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

BAC Plant and Animal Biology: Suggested Study Strategy

1Practise diagrams, genetic crosses and written explanations of life functions.
2Use official papers and marking schemes for the applicable profile. Practise writing complete answers under the three-hour limit.
3Use the questions to identify gaps, then explain why each alternative fails without looking at the feedback.

Frequently Asked Questions

Is this the official examination format or an official translation?

Independent English-language MCQ study adaptation. It is not an official translation, an official-format simulation, or a substitute for Romanian-language reading and writing, full worked solutions, or oral and practical preparation.

What else does the full Bacalaureat require?

Other written papers and required competence assessments: Romanian oral communication, mother-tongue oral communication where applicable, a studied foreign language and digital competence. These must be completed or formally recognised. The subject bank does not replace them.

Which paper and language should I prepare for?

Romanian is confirmed. Candidates who studied a subject in a minority language may request that language under the methodology; availability depends on the subject and route. Practise diagrams, genetic crosses and written explanations of life functions.