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Unit 1: Molecular and Cellular Biology

Study guide for CLEP CLEP Biology — Unit 1: Molecular and Cellular Biology. Practice questions, key concepts, and exam tips.

291

Practice Questions

29

Flashcards

9

Key Topics

Key Concepts to Study

cell membrane transport
enzyme kinetics
cellular respiration
photosynthesis
mitosis vs meiosis stages
transcription and translation
DNA mutations
biomolecules (carbohydrates lipids proteins nucleic acids)
viruses and prions

Sample Practice Questions

Try these 5 questions from this unit. Sign up for full access to all 291.

Q1MEDIUM

When did the human genus Homo emerge?

A) 2 million years ago
B) 2.5 million years ago
C) 3 million years ago
D) 4 million years ago
E) 5 million years ago
Show Answer

Answer: B — 2.5 million years ago is correct because this marks the appearance of the first tools and the emergence of Homo habilis, considered the first species of the human genus.

Q2MEDIUM

Which of the following is an example of photoperiodicity?

A) Plant growth in response to touch
B) Flowering in response to day length
C) Root growth in response to gravity
D) Stem growth in response to water
E) Leaf movement in response to temperature
Show Answer

Answer: B — Flowering in response to day length is correct because photoperiodicity refers to the ability of plants to measure day length and respond with physiological changes, such as flowering.

Q3MEDIUM

What is the primary role of the polarity of the water molecule in biological systems?

A) To facilitate the formation of hydrogen bonds with other water molecules, allowing it to play a crucial role in biological processes
B) To reduce the surface tension of water, making it less essential for biological systems
C) To increase the viscosity of water, making it more difficult for cells to function
D) To disrupt the formation of hydrogen bonds with other molecules, allowing it to play a minor role in biological processes
E) To decrease the boiling point of water, allowing it to exist in a liquid state at higher temperatures
Show Answer

Answer: A — The polarity of the water molecule allows it to form hydrogen bonds, which is essential for its role in biological processes, such as protein folding and cell signaling.

Q4HARD

What is the main criterion used to classify organisms into different domains?

A) Cell wall composition
B) Membrane structure
C) Metabolic pathways
D) Cell type and membrane-bound organelles
E) Ribosomal RNA sequences
Show Answer

Answer: E — Ribosomal RNA sequences is correct because they are used to determine the evolutionary relationships among organisms and classify them into different domains, such as Archaea, Bacteria, and Eukarya.

Q5MEDIUM

A scientist is analyzing the structure of a newly discovered molecule and finds that it contains the sugar ribose and the nitrogenous base uracil. Which of the following is the most likely identity of this molecule?

A) RNA
B) DNA
C) Protein
D) Carbohydrate
E) Lipid
Show Answer

Answer: A — The presence of ribose and uracil indicates that the molecule is RNA, as DNA contains deoxyribose and thymine instead.

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Study Tips for Unit 1: Molecular and Cellular Biology

  • Focus on understanding concepts, not memorizing facts — CLEP tests application
  • Practice with timed questions to build exam-day speed
  • Review explanations for wrong answers — they reveal common misconceptions
  • Use flashcards for key terms, practice questions for deeper understanding

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