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EXSC 223- Exam 1 Comprehension Q&A 100% Solved | Graded A+ £6.69
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EXSC 223- Exam 1 Comprehension Q&A 100% Solved | Graded A+
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EXSC 223- Exam 1 Comprehension Q&A 100% Solved | Graded A+ What process establishes the resting membrane potential? - Diffusion of ions, mainly the diffusion of K+ from the cell through leakage channels, establishes resting membrane potential Is the inside of the plasma membrane negative or po...

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  • December 23, 2024
  • 21
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • exsc 223

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  • EXSC 223
  • EXSC 223

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EXSC 223- Exam 1 Comprehension Q&A

100% Solved | Graded A+


What process establishes the resting membrane potential? - ✔✔Diffusion

of ions, mainly the diffusion of K+ from the cell through leakage channels,

establishes resting membrane potential

Is the inside of the plasma membrane negative or positive relative to its

outside in a polarized membrane of a resting cell? - ✔✔In a polarized

membrane of a resting cell, the inside is negative relative to its outside

What term is used to indicate signaling chemicals that bind to membrane

receptors? - ✔✔Ligands

Which type of membrane receptor is most important in directing

intracellular events by promoting formation of second messengers? - ✔✔G

protein-linked receptors direct intracellular events by promoting formation of

second messangers

Which organelle is the major site of ATP synthesis? - ✔✔Mitochondria

What are three organelles involved in protein synthesis and how do these

organelles interact in that process? - ✔✔Ribosomes are the sites of protein

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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

,synthesis. The rough ER provides a site for ribosome attachment, and its

cisterns package into vesicles the proteins made on the ribosomes for

transport to the Golgi apparatus. The Golgi apparatus modifies and

packages the proteins it receives for various destinations within or outside

the cell

Compare the functions of lysosomes and peroxisomes. - ✔✔The lysosomal

enzymes digest foreign substances engulfed by the cell, non useful or

deteriorating organelles, or even the cell itself to prevent the buildup of

cellular debris. The enzymes in peroxisomes detoxify harmful chemicals

and neutralize free radicals

How are microtubules and microfilaments related functionally? - ✔✔Both

microfilaments and microtubules are involved in organelle movements

within the cell and/or movements of the cell as a whole

Of microfilaments, microtubules, or intermediate filaments, which is most

important in maintaining cell shape? - ✔✔Intermediate filaments are the

most important cytoskeletal elements in maintaining cell shape

The major function of cilia is to move substances across the free cell

surface. What is the major role of microvilli? - ✔✔The major function of

microvilli is to increase the cell's surface area for absorption of substances


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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

, If a cell ejects or loses its nucleus, what is its fate and why? - ✔✔The cell

dies because it's unable to make proteins which include the enzymes

needed for all metabolic reactions

What is the role of nucleoli? - ✔✔Nucleoli are the site of synthesis of

ribosomal subunits

What is the importance of the histone proteins present in the nucleus? -

✔✔Histone proteins provide the means to pack DNA in a compact, orderly

way, and they play a role in gene regulation

If one of the DNA strands being replicated reads CGAATG, what will be the

base sequence of the corresponding DNA strand? - ✔✔GCTTAC

During what phase of the cell cycle is DNA synthesized? - ✔✔DNA is

synthesized during the S phase

What are three events occurring in prophase that are undone in telophase?

- ✔✔Nuclear envelope breaks up, spindle forms, nucleoli disappear, and

the chromosomes coil and condense

Codons and anticodons are both three-base sequences. How do they

differ? - ✔✔Codons are three-base sequences in mRNA, each of which

specifies an amino acid. Anticodons are three-base sequences in tRNA




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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

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