Quiz: Important Biology Questions For Students!

37 Questions | By Drimi89 | Updated: Mar 20, 2022 | Attempts: 340

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Quiz: Important Biology Questions For Students! - Quiz

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1.

From the perspective of a cell receiving messages, the three stages of cell signaling are:
- A.
  
  Paracrine, local, synaptic
- B.
  
  Reception, transduction, and cell response
- C.
  
  Reception, cell response, cell division
- D.
  
  Alpha, beta, and gamma stages
2.

The signal transduction pathway in animals that use epinephrine:
- A.
  
  Involves activation of glycogen breakdown in liver cells
- B.
  
  Is a classic example of paracrine signaling
- C.
  
  Is a classic example of synaptic signaling
- D.
  
  Operates independently of receptors on the cell surface
- E.
  
  None of these decribes the epinephrine system
3.

The process of signal transduction usually begins:
- A.
  
  After the target cell divides
- B.
  
  When the hormone is released into the blood
- C.
  
  When the signal molecule changes the receptor protien in some way
- D.
  
  After the third stage of cell signaling is completed
- E.
  
  None of these show the start of signal transduction
4.

Sutherland discovered that epinephrine:
- A.
  
  Binds to calcium ions
- B.
  
  Lowers blood glucose by binding to cells
- C.
  
  Interacts with insulin inside muscle cells
- D.
  
  Does not interact directly with glycogen phosphorylase
5.

Most signal molecules: , , and .
- A.
  
  Never enter the ctyosol of the cell
- B.
  
  Are water soluable
- C.
  
  Can't pass through the plasma membrane
- D.
  
  None of these are correct
- E.
  
  All of the above apply to most signal molecules
6.

Ligand bound tryosine kinase signal receptors:
- A.
  
  Activate the kinase domain after they form dimers
- B.
  
  Activate the kinase domain before they form dimers
- C.
  
  Activate the G-protien that stimulates second messenger production
- D.
  
  Are not capable of hydrolyzing ATP
7.

If an animal lacked adenylyl cyclase, it:
- A.
  
  Would not be able to transmit nerve inpulse via a synapse
- B.
  
  Could not convert GTP to ATP
- C.
  
  Would lack membrane bound receptors
- D.
  
  Would not respond properly to epinephrine signals
8.

Which of the following is NOT considered a second messenger?
- A.
  
  CAMP
- B.
  
  Adenylyl cyclase
- C.
  
  Calcium ions
- D.
  
  Inositol triphosphate
9.

Which one of the following is NOT part of the phosphorylation cascade model?
- A.
  
  A signal molecule binds to a membrane receptor protien
- B.
  
  Protien Kinase is activated
- C.
  
  ATP donates a phosphate group to an inactive protien kinase
- D.
  
  A specific protien is activated via phosphorylation
- E.
  
  All the above are part of the phosphorylation cascade
10.

One of these statements about cell communication is incorrect. Which is it?
- A.
  
  Cell signaling was an early event in the evolution of life.
- B.
  
  Communicating cells may be close together or far apart.
- C.
  
  Most receptor molecules are bound to the outer membrane of the nuclear envelope.
- D.
  
  Protien phosphorylation is a major mechanism of signal transduction.
11.

One of the major differences in cell division between prokaryotic and eukaryotic cells is that in prokaryotes:
- A.
  
  Cytokinesis does not occur
- B.
  
  Genes are not duplicated
- C.
  
  No spindle forms
- D.
  
  DNA replication does not occur
12.

In eukaryotic organisms, chromosomes are duplicated________ cell division
- A.
  
  Before
- B.
  
  During
- C.
  
  After
- D.
  
  It depends on the specific organism
13.

Which of the following organelles contain DNA and replicate primarily under their own direction?
- A.
  
  Centromeres
- B.
  
  Mitochondria
- C.
  
  Ribosomes
- D.
  
  Golgi
14.

A centromere would be found:
- A.
  
  In the cytoplasm
- B.
  
  In the nucleous
- C.
  
  On a Chromatid
- D.
  
  In a ribosome
15.

DNA is synthesized during the ______ phase of the cell cycle.
- A.
  
  G1
- B.
  
  S
- C.
  
  G2
- D.
  
  M
16.

During both prophase AND metaphase of mitosis, sister chromatids:
- A.
  
  Have one-half the amount of DNA as does the original G1 Chromosome
- B.
  
  Move together toward one pole of the cell
- C.
  
  Are connected at a region called the centromere
- D.
  
  Are coiled or uncondensed
17.

In mitosis, when do the centromeres split?
- A.
  
  Prophase
- B.
  
  Metaphase
- C.
  
  Anaphase
- D.
  
  Telophase
18.

Depolymerization or breakdown of ____ happens as chromatids move toward the cell poles.
- A.
  
  Centrioles
- B.
  
  Kinetochore fibers
- C.
  
  Actin fibers
- D.
  
  Nucleoli
19.

Density dependant contact inhibition is:
- A.
  
  When a cell stops metabolizing when it contacts another one in a cell culture.
- B.
  
  When a cell stops dividing when it contacts others in a cell culture
- C.
  
  When a girl slaps a boy because he touched her
- D.
  
  None of hte above describes contact inhibition
20.

What is the haploid number of chromosomes in a beetle that has 34 chromosomes in its sperm cells?
- A.
  
  17
- B.
  
  34
- C.
  
  68
- D.
  
  Can't tell- need more information
21.

When does the 2n-->n reduction occur in meosis?
- A.
  
  Metaphase I
- B.
  
  Anaphase I
- C.
  
  Metaphase II
- D.
  
  Anaphase II
22.

Genetic recombination involves:
- A.
  
  Crossing over between nonsister chromatids
- B.
  
  Random fertilization of gametes
- C.
  
  Independant assortment of chromasomes
- D.
  
  All of the above are involved
23.

Homologous chromosomes:
- A.
  
  Have identical genes
- B.
  
  Have genes for the same traits at the same loci
- C.
  
  Pair up in prophase II
- D.
  
  Are found in all haploid cells
24.

When do centromeres split during meiosis?
- A.
  
  Anaphase I
- B.
  
  Anaphase II
- C.
  
  Metaphase I
- D.
  
  Metaphase II
25.

A major difference between mitosis and meiosis is:
- A.
  
  Mitosis occurs only in the gonads
- B.
  
  Crossing over happens only in mitosis
- C.
  
  Duplicated chromosomes synapse with homologues in meiosis
- D.
  
  The nuclear membrane does not fragment in meiosis