LIFESCI: 7C - Study guides, Class notes & Summaries

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Exam (elaborations)

LS7A: Final Exam Questions with Complete Solutions Graded A+
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June 2026

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c and a - Answer In lab, a dialysis tube is filled with a 15% sucrose solution, sealed, and placed in an unlabeled beaker filled with clear liquid. The dialysis tube is made of a semipermeable membrane that allows the free passage of water, but is not permeable to sucrose. After 2 hours, the bag in the beaker decreases in size and becomes flaccid. This observation suggests that at the beginning of the experiment, the solution in the bag was __________________ compared to the solution in the...
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LS7C: Final UCLA Latest Exam with Guaranteed Pass Solutions 2026-2027 Updated.
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Cellular comm consists of 4 essential parts - Answer -signaling cell -signaling molecule -receptor protein -responding cell signaling cell - Answer The source of the signaling molecule signaling molecule - Answer -carries info from 1 cell to the next -binds to a receptor protein on/in the responding cell -vary immensely and include peptides, lipids, and gases responding cell - Answer The cell that receives info from the signaling molecule steps in cell signal...
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LS 7C: Midterm 1 Test Questions Solved Correct.
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A drug selectively blocks Ca2+ channels at the axon terminus. The membrane potential at the terminus will: - Answer not change If you are able to change the resting membrane potential of a neuron from -70 to -80 mV, firing an action potential in that neuron would be: - Answer harder A mutation on the voltage gated potassium channels that renders them non-function will ___ the time an action potential normally takes to complete. - Answer increase The membrane permeability ...
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LS 7C: Midterm 1 Learning Objectives Test Questions and All Correct Answers 2026Updated.
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Discuss how a signal can lead to both short- and long-term responses - Answer Signaling cell —> signaling molecule —> receptor protein —> responding Signal binds and receptor is activated (conformational change) Signal transduction— one molecule activates the next Response— enzyme activation, turn on genes, signal other cells, cause transcription of proteins Receptor Kinase activity because changes gene expression=> long-term G-Protein-coupled rec...
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LS 7C MIDTERM 2 Study Guide Exam and All Correct Answers 2026 Updated.
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what happens when sound vibrations hit the tympanic membrane (eardrum)? - Answer tympanic membrane vibrates, causes stapes to push oval window, oval window vibration pushes fluid through cochlea what happens once sound vibrations reach the cochlea? - Answer push basilar membrane up, hair cells bend and depolarize, push tectorial membrane >> triggers neurotransmitter release what do hair cell stereocilia bend against? - Answer the tectorial membrane what happens to h...
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Exam (elaborations)

LS 7C Final Exam Questions and Answers.
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microbiota - Answer refers to the organisms themselves ( includes bacteria, viruses, archaea, fungi, and protozoa) microbiome - Answer entire habitat including microorganisms, their genomes, and their surroundings conditions metagenome - Answer collection of genes and genomes from microbiota holobiont - Answer entire host and its microbe symbionts symbiont - Answer different organisms that live together mutualist - Answer host and microbes benefit ...
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Exam (elaborations)

LifeSci 7C: Midterm 2 Clickers Test Questions and Answers.
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Meniere's Disease is linked to an excessive volume of endolymph fluid. Where in the ear is endolymph found? A. Outer ear B. Middle ear C. Inner ear D. B and C E. A, B, and C - Answer Inner ear. Although the exact cause of Meniere's Disease remains a mystery, which of the following could most reasonably be caused by a build up of excessive endolymph fluid? A. Auditory canal becomes blocked B. Hair cell function is altered C. Stapes can no longer vibrate D. Tympanic me...
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LifeSci 7C - Physiology - Final Exam Questions and All Correct Answers 2026 Updated.
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GAS EXCHANGE - Answer One of the functions of the cardiovascular and respiratory systems is to rid the body of CO2 . Where does the CO2 come from? - Answer CO2 is a breakdown product of the carbohydrates oxidized in cellular respiration The lungs are highly branched. What is the primary purpose of this branching? - Answer It increases the surface area of the lungs -The alveoli account for volume How do gases "know" which way to flow? - Answer Gas flo...
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Life Science: W10 PEQs Test Questions and All Correct Answers.
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June 2026

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Shown below is the start of a coding region within the first exon of a gene. Which sequence could you use for your sgRNA? 5'-GCTCTTAGATATTCCACGACACAGCATGTCAAGAGAAGTACAGTAATGACGGACTAGTA-3' 3'-CGAGAATCTATAAGGTGCTGTGTCGTACAGTTCTCTTCATGTCATTACTGCCTGATCAT-5' (a) 3' CGACACAGCATGTCAAGAGA 5' (b) 5' CGACACAGCATGTCAAGAGA 3' (c) 3' GCTGTGTCGTACAGTTCTCT 5' (d) 5' GCTGTGTCGTACAGTTCTCT 3' - Answer (c) 3' GCTGTGTCGTACAGTTCTCT 5' Shown below is the sta...
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Exam (elaborations)

Life Science 7C: Fall 2023 Midterm – UCLA Test Questions Fully Solved.
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What does complex multicellularity require? - Answer Cohesion among cells Communication among cells How do cells communicate? - Answer Through molecular signals What are gap junctions? - Answer (communicating junctions) provide cytoplasmic channels between adjacent cells What are the two things that influence cell activity? - Answer physical environment and neighboring cells/nearby/distant What are the 4 things that contribute to communication by chemical signals...
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