Past Second Cell Biology Exams

Lorimer

exocytosis

Proteins that are secreted leave the cell through:

peroxisomes

Which of these organelles does not contain DNA?:

help proteins fold correctly

Chaperones:

peroxisome

This is a semi-autonomous organelle, but unlike the other semi autonomous organelles it does not contain its own DNA:

nucleolus

This is the site of ribosomal RNA synthesis and ribosome subunit assembly:

all

Which of these is not done by peroxisomes?:

the golgi apparatus

This organelle does the O-linked glycosylations on glycoproteins:

through the outer and inner membrane

The TOM and TIM complexes: transport proteins into the mitochondria:

The location of histones on DNA is determined by specific DNA binding sites and is stable

Which of these is not true of histones?:

binds to a nuclear import receptor

When a protein is transported into the nucleus it does so by having a sequence of amino acids called a nuclear localization signal which:

by being carried by the GTP form of Ran

Proteins can be exported from the nucleus:

all

Histones:

scaffold

DNA in eukaryotes is organized into condensed chromosomes on a backbone of ___________ proteins:

H1

Which histone is the least conserved:

all

Code reader-writer complexes:

8

How many polypeptides are needed to form a histone core:

nucleosome

A region of DNA wrapped around a histone is called a:

all

Which of these is true of glycolipids?:

all

Membranes are structurally organized through:

phospholipids

Sphingomyelin, sphingosine, phosphatidylethanolamine, and phosphatidylserine are:

a ball of amphipathic molecules with hydrophobic tails on the inside

A micelle is:

phospholipid bilayers

All living cells membranes' essential structure is formed by:

cholesterol

Animal cells have no cell walls and use this to add rigidity to their membranes:

all

Phosphoenolpyruvate to pyruvate:

O2

Which of these can most easily pass a cell membrane:

in the inner mitochondrial membrane

ATP synthase is located:

are often involved in forming a pore or channel in the membrane

β-barrels in transmembrane proteins:

Every species has one species specific ratio of phospholipid molecules in all of its membranes

Which of these is not true about membrane structures in eukaryotic cells:

all

Calmodulin:

results in the increase of cytoplasmic Ca++ which acts as a second messenger

Phospholipase C, when activated:

Paracrine

These signals diffuse through cells nearby the signaling cell:

the second messenger system

The specificity of signal transduction depends on all but which of these?:

all

Through signal transduction cells can:

the ligand or signal

The first messenger in signal transduction is:

drugs that activate receptors that they bind to

In pharmaceuticals that act on signal receptors. Agonists are:

they phosphorylate GDP to make GTP to activate

Which of these is not true of G-proteins?:

ATP synthase

Which of these is an F-type pump?:

all

Which of these is a way that molecules can pass across a membrane with the concentration gradient?:

all

Ion channels:

uses a transport protein

Facilitated diffusion:

is isotonic

In order for a red blood cell to maintain its distinctive disk shape it is important that solution it is suspended in:

It is an even cation exchanger causing no net change in charge in the cell

Which of the following is not true of the sodium potassium pump:

osmotic pressure

This diagram shows a process with the equilibrium state on the right. It is be used to measure:

all

Which of these can drive active transport?:

Cholesterol

Animal cells have no cell walls and use this to add rigidity to their membranes:

all

Which of these is true of glycolipids?

is a protein with a transmembrane domain

This graph shows a protein that:

all

Membranes are structurally organized through:

Have hydrophobic and hydrophilic parts that solubilize fats and membranes

Detergents:

all

A cell in a hypotonic aqueous solution:

all

Proteins that function in or at membranes:

O2

Which of these can most easily pass a cell membrane?

A ball of amphipathic molecules with hydrophobic tails on the inside

A micelle is:

H1

Which of these is not part of the core histone?

all

Code reader-writer complexes:

all

Euchromatin:

Scaffold

DNA in eukaryotes is organized into condensed chromosomes on a backbone of _____ proteins:

transported by import receptors

Proteins get into the nucleus:

H1

Which histone is the least conserved?

Binds to a nuclear import receptor

When a protein is transported into the nucleus it does so by having a sequence of amino acids called a nuclear localization signal which:

8

How many polypeptides are needed to form a histone core?

by being carried by the GTP form of Ran

Proteins can be exported from the nucleus:

A karyotype

This is a way to look at the number, size, and centromere position of the chromosomes in prophase in an organism:

They phosphorylate GDP to make GTP to activate

Which of these is not true of G-proteins?

all

RAS:

Paracrine

These signals diffuse through cells nearby the signaling cell:

all

GCPRs:

The second messenger system

The specificity of signal transduction depends on all but which of these?

Receptor tyrosine kinases

A number of growth factor receptors are:

It is converted back into ATP by Protein Kinase A

Which of these is not true of cAMP?

drugs that activate receptors that they bind to

In pharmaceuticals that act on signal receptors. Agonists are:

uses a transport protein

Facilitated diffusion:

transport proteins in the mitochondria; outer and inner membrane

The TOM and TIM complexes are:

By way of active transport proteins

Which of these is a way that molecules can pass across a membrane against the concentration gradient?

Osmotic pressure

This diagram shows a process with the equilibrium state on the right. It is be used to measure:

Voltage gated ion channel such as some Na+ channels in neurons

Which of the following is not a type of ATP-driven pump?

all

Active transport is different from passive transport in that active transport:

Aquaporin

The channel protein has its channel lined with hydrophobic amino acids along one side and hydrophilic charged amino acids with alternating positive and negative ones down the rest of it. This is perfect for what it allows through the channel. This protein is:

all

Which of these is a way that molecules can pass across a membrane with the concentration gradient?

Lysosomes

Which of these is not semi-autonomous organelles?

Peroxisomes

Which organelle can often be identified by large square crystals inside of them?

The golgi apparatus

This organelle does the O-linked glycosylations on glycoproteins:

The nucleolus

This is the site of ribosomal RNA synthesis and ribosome subunit assembly:

COP II

This protein is essential to target vesicles from the endoplasmic reticulum to the cis face of the golgi:

Exocytosis

Proteins that are secreted leave the cell through:

A peroxisome

This is a semi-autonomous organelle, but unlike the other semi autonomous organelles it does not contain its own DNA:

A peroxisome

This organelle contains a large quantity of an enzyme called catalase:

It pumps sodium into the cell

Which of these is not true of the sodium potassium pump?

An ABC transporter

An active transporter that undergoes conformational change on binding ATP is:

all

Which of these is a way that molecules can pass across a membrane with the concentration gradient?

all

Ion channels:

By way of active transport proteins

Which of these is a way that molecules can pass across a membrane against the concentration gradient?

Aquaporin

This channel protein has its channel lined with hydrophobic amino acids along one side, the hydrophilic
charged amino acids with alternating positive and negative ones down the rest of it. This is perfect for
what it allows through the channel. This protein is..…

Peroxisomes

Which organelle can often be identified by large square crystals inside of them?

all true

Which of these is not done by peroxisomes?

Peroxisomes

Which of these organelles does not contain DNA?

Help proteins fold correctly

Chaperones:

all true

Which of these is not true of axons:

The rapid depolarization of a cell

An action potential is:

Are many small projections of a neuron that can get signals from and to other neurons

Dendrites: