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MCAT Biology Practice Test

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Medicine Quiz on MCAT Biology Practice Test, created by Ameen Siddiqui on 07/07/2020.
Ameen Siddiqui
Quiz by Ameen Siddiqui, updated more than 1 year ago More Less
Christine Sang
Created by Christine Sang almost 10 years ago
Ameen Siddiqui
Copied by Ameen Siddiqui almost 4 years ago
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Resource summary

Question 1

Question
Which of the following is not a characteristic of bacteria:
Answer
  • Peptidoglycan in the cell wall
  • Protein synthesis inhibited by diptheria toxin
  • Protein synthesis inhibited by chloramphenicol
  • DNA exists in nucleoids

Question 2

Question
A ribozyme is...
Answer
  • an enzyme that degrades RNA
  • involves in synthesizing primers for DNA replication
  • required for RNA polymerase activity
  • an RNA that has enzymatic activity

Question 3

Question
Which of the following bacterial components is made of DNA?
Answer
  • ribosomes
  • plasmids
  • lysosomes
  • chromatophores

Question 4

Question
Which is a function of the smooth endoplasmic reticulum?
Answer
  • modify proteins for export
  • synthesize phospholipids
  • detoxify drugs
  • digest fatty acids

Question 5

Question
80s ribosomes are assembled in the:
Answer
  • nucleotide
  • nucleoid
  • nucleolus
  • nuclear lamina

Question 6

Question
A Gram-positive bacterial cell may have:
Answer
  • two phosphlipid bilayers
  • two peptidoglycan regions
  • LPS
  • flagella

Question 7

Question
Which would you not find in a prokaryotic cell?
Answer
  • spliceosomes
  • ribosomal RNA
  • RNA primases
  • aminoacyl-tRNA synthetases

Question 8

Question
Peripheral membrane proteins are:
Answer
  • not essential for the cell's existence
  • found only on the outer surface of the cell
  • attached to biological membranes through interactions with integral membrane proteins
  • often found to form pumps that move ions through membranes

Question 9

Question
Which of the following is an example of a protein's secondary structure?
Answer
  • alpha helixes
  • hydrophobic interactions
  • amino acid sequence
  • nucleotide sequence

Question 10

Question
Which molecule does not contain glucose?
Answer
  • starch
  • cellulose
  • sucrose
  • fructose

Question 11

Question
The function of the glycogen is:
Answer
  • provide structure within the cell
  • provide structure outside of the cell
  • allow movement of the cell
  • provide energy storage for the cell

Question 12

Question
Which of the following is NOT a polysaccharide?
Answer
  • Glycogen
  • Starch
  • Galactose
  • Chitin

Question 13

Question
If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products is to:
Answer
  • Add more of the enzyme
  • Heat the solution to 90 degrees C
  • Add more substrate
  • Add an allosteric inhibitor

Question 14

Question
An enzyme accelerates a metabolic reaction by
Answer
  • altering the overall free-energy change for the reaction
  • making an endergonic reaction occur spontaneously
  • lowering the activation energy
  • pushing the reaction away from equilibrium

Question 15

Question
Which of the following is not associated with allosteric regulation of an enzyme's activity?
Answer
  • A molecule mimics the substrate and competes for the active site
  • A naturally occurring molecule stabilizes a catalytically active conformation
  • regulatory molecules bind to a site remote from the active site
  • Inhibitor and activator molecules may compete with one another

Question 16

Question
A scientist purified a protein from animal cells and made fluorescent antibodies to it. When she isolated pieces of the plasma membrane from another batch of aniaml cells and added the fluorescent antibodies, she could see fluorescence on both sides of the membrane. She tried to isolate the protein from the membranes but could not do so without destroying the membranes. The protein was probably...
Answer
  • a peripheral protein
  • a farnesyl-anchored protein
  • a transmembrane protein
  • a cytosolic protein

Question 17

Question
Which statement is false?
Answer
  • Plant cells undergo plasmlysis when they are places in a hypertonic solution
  • The cell wall prevents plant cells from bursting when they are places in a hypotonic solution
  • Animal cells shrink in size when they are placed in hypertonic solution
  • An animal cell place in a 1M solution of sucrose, or a 1M solution of isopropanol, will shrink.

Question 18

Question
Which of the following is NOT true of the sodium/potassium pump of animal cells?
Answer
  • it undergoes conformational changes
  • it uses the energy from ATP
  • it creates a membrane potential
  • it serves as an example of a secondary active transport system

Question 19

Question
Bacteria and Archaea have different? Check all that apply.
Answer
  • ribosomes
  • cell walls
  • lipids

Question 20

Question
Cyanide prevents electrons from leaving the ETC.
Answer
  • True
  • False
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