Quiz
MCAT Biology Practice Test
Este quiz tem tempo limite, por isso abre no player de sempre.
Perguntas do quiz (20)
1Which of the following is not a characteristic of bacteria:
- APeptidoglycan in the cell wall
- BProtein synthesis inhibited by diptheria toxin
- CProtein synthesis inhibited by chloramphenicol
- DDNA exists in nucleoids
2A ribozyme is...
- Aan enzyme that degrades RNA
- Binvolves in synthesizing primers for DNA replication
- Crequired for RNA polymerase activity
- Dan RNA that has enzymatic activity
3Which of the following bacterial components is made of DNA?
- Aribosomes
- Bplasmids
- Clysosomes
- Dchromatophores
4Which is a function of the smooth endoplasmic reticulum?
- Amodify proteins for export
- Bsynthesize phospholipids
- Cdetoxify drugs
- Ddigest fatty acids
580s ribosomes are assembled in the:
- Anucleotide
- Bnucleoid
- Cnucleolus
- Dnuclear lamina
6A Gram-positive bacterial cell may have:
- Atwo phosphlipid bilayers
- Btwo peptidoglycan regions
- CLPS
- Dflagella
7Which would you not find in a prokaryotic cell?
- Aspliceosomes
- Bribosomal RNA
- CRNA primases
- Daminoacyl-tRNA synthetases
8Peripheral membrane proteins are:
- Anot essential for the cell's existence
- Bfound only on the outer surface of the cell
- Cattached to biological membranes through interactions with integral membrane proteins
- Doften found to form pumps that move ions through membranes
9Which of the following is an example of a protein's secondary structure?
- Aalpha helixes
- Bhydrophobic interactions
- Camino acid sequence
- Dnucleotide sequence
10Which molecule does not contain glucose?
- Astarch
- Bcellulose
- Csucrose
- Dfructose
11The function of the glycogen is:
- Aprovide structure within the cell
- Bprovide structure outside of the cell
- Callow movement of the cell
- Dprovide energy storage for the cell
12Which of the following is NOT a polysaccharide?
- AGlycogen
- BStarch
- CGalactose
- DChitin
13If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products is to:
- AAdd more of the enzyme
- BHeat the solution to 90 degrees C
- CAdd more substrate
- DAdd an allosteric inhibitor
14An enzyme accelerates a metabolic reaction by
- Aaltering the overall free-energy change for the reaction
- Bmaking an endergonic reaction occur spontaneously
- Clowering the activation energy
- Dpushing the reaction away from equilibrium
15Which of the following is not associated with allosteric regulation of an enzyme's activity?
- AA molecule mimics the substrate and competes for the active site
- BA naturally occurring molecule stabilizes a catalytically active conformation
- Cregulatory molecules bind to a site remote from the active site
- DInhibitor and activator molecules may compete with one another
16A 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...
- Aa peripheral protein
- Ba farnesyl-anchored protein
- Ca transmembrane protein
- Da cytosolic protein
17Which statement is false?
- APlant cells undergo plasmlysis when they are places in a hypertonic solution
- BThe cell wall prevents plant cells from bursting when they are places in a hypotonic solution
- CAnimal cells shrink in size when they are placed in hypertonic solution
- DAn animal cell place in a 1M solution of sucrose, or a 1M solution of isopropanol, will shrink.
18Which of the following is NOT true of the sodium/potassium pump of animal cells?
- Ait undergoes conformational changes
- Bit uses the energy from ATP
- Cit creates a membrane potential
- Dit serves as an example of a secondary active transport system
19Bacteria and Archaea have different? Check all that apply.
- Aribosomes
- Bcell walls
- Clipids
20Cyanide prevents electrons from leaving the ETC.
- AVerdadeiro
- BFalso
Informações
- Descrição
- SAT MCAT Quiz sobre MCAT Biology Practice Test, criado por Christine Sang em 22-05-2014.
- Autor
- Christine Sang
- Idioma
- English
- Visualizações
- 4.571
- Etiquetas
- Avaliação
- 4,3 de 5 · 3 avaliações Avalie este quiz