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AP Biology Unit 2B: Membrane Transport, Tonicity & Cell Size — practice questions — page 3

Explore 93 free Unit 2B: Membrane Transport, Tonicity & Cell Size questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2B: Membrane Transport, Tonicity & Cell Size questions and exercises with answers

Showing questions 61–90 of 93.

A very fine needle can pierce a plasma membrane without bursting the cell because the membrane:Read the answer and worked solution →HIV is hard to vaccinate against partly because its surface recognition sites:Read the answer and worked solution →Water in or water out?Read the answer and worked solution →Match each membrane term to its meaningRead the answer and worked solution →Which membrane holds more protein?Read the answer and worked solution →Complete the diffusion ruleRead the answer and worked solution →True or false: the plasma membraneRead the answer and worked solution →Order the membrane models by dateRead the answer and worked solution →Which part of the membrane is it?Read the answer and worked solution →Which one does not belong?Read the answer and worked solution →Plants, algae and cyanobacteria that use light to make their own food are called:Read the answer and worked solution →Bacteria at a deep sea vent make sugars using energy from inorganic chemicals. They are:Read the answer and worked solution →Photosynthesis powers what share of Earth's ecosystems?Read the answer and worked solution →In leaves, most photosynthesis occurs in the middle cell layer called the:Read the answer and worked solution →Gas exchange in a leaf occurs through small regulated openings called:Read the answer and worked solution →Each stoma is flanked by cells that open and close it by swelling or shrinking, called:Read the answer and worked solution →Stacked disc-shaped structures inside a chloroplast where chlorophyll is embedded are:Read the answer and worked solution →A stack of thylakoids is called a:Read the answer and worked solution →The liquid-filled space surrounding the grana, where the Calvin cycle occurs, is the:Read the answer and worked solution →The light-dependent reactions take place in the thylakoid membrane and produce:Read the answer and worked solution →Shorter wavelengths of light carry:Read the answer and worked solution →Which colour of visible light has the shortest wavelength and most energy?Read the answer and worked solution →Chlorophyll appears green because green light is:Read the answer and worked solution →Photosystems are numbered by:Read the answer and worked solution →In photosystem II, the electron lost by the reaction center is replaced by splitting:Read the answer and worked solution →The reaction center of photosystem II is called:Read the answer and worked solution →About what share of oxygen made in a leaf is used by its own mitochondria?Read the answer and worked solution →The flow of hydrogen ions through ATP synthase from the thylakoid lumen to the stroma is called:Read the answer and worked solution →The enzyme that catalyses the reaction between carbon dioxide and RuBP is:Read the answer and worked solution →RuBP, the molecule that starts the Calvin cycle, has how many carbon atoms?Read the answer and worked solution →

Worked practice questions

A very fine needle can pierce a plasma membrane without bursting the cell because the membrane:

  1. Is a rigid sheet that resists all force
  2. Flows and self-seals once withdrawn
  3. Expands like a balloon around the tip
  4. Dissolves and reforms from fresh lipid
Show answer and solution

Correct answer: B. Flows and self-seals once withdrawn

1. The membrane is fairly rigid and can burst if penetrated or if a cell takes in too much water. 2. Its mosaic nature nonetheless leaves it mobile in the plane of the sheet. 3. Because of that mosaic nature, a very fine needle can easily penetrate a plasma membrane without causing it to burst. 4. The membrane will flow and self-seal when the needle is extracted. 5. It is explicitly not like a balloon that expands and contracts, which rules out option C. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_

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HIV is hard to vaccinate against partly because its surface recognition sites:

  1. Are hidden beneath a thick capsule
  2. Are identical to human blood markers
  3. Change rapidly because of mutations
  4. Disappear entirely inside a host cell
Show answer and solution

Correct answer: C. Change rapidly because of mutations

1. A virus enters a cell by binding sites on the cell surface that are specific to it. 2. A vaccine works by teaching antibodies to recognise the virus surface. 3. The recognition sites on HIV change at a rapid rate because of mutations. 4. The antibodies will not recognise the new variations of the surface patterns. 5. So the difficulty is a moving target, not concealment or disappearance. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_

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Water in or water out?

Read exercise and reference answers
Left
Water enters
Items
  1. Item
    Hypotonic outside
    Answer
    Water enters
  2. Item
    Hypertonic outside
    Answer
    Water leaves
  3. Item
    Cell swells
    Answer
    Water enters
  4. Item
    Cell shrinks
    Answer
    Water leaves
  5. Item
    Solutes lower out
    Answer
    Water enters
  6. Item
    Solutes higher out
    Answer
    Water leaves
  7. Item
    Risk of bursting
    Answer
    Water enters
  8. Item
    More water inside
    Answer
    Water leaves
Right
Water leaves
Instructions
Swipe left if water enters the cell, right if water leaves it.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_

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