Cell Biology

Which of the following characteristics does NOT distinguish the archaea from the bacteria?

Which of the following characteristics does NOT distinguish the archaea from the bacteria?

Which of the following characteristics does NOT distinguish the archaea from the bacteria?
A) the types of transfer RNA used
B) the rRNA sequences present
C) the deoxyribonucleotides
D) cell wall composition
E) cell membrane

cuchillo   265   3 Replies

archie90

The metabolic processes called fermentation

The metabolic processes called fermentation

The metabolic processes called fermentation
A) produce substrates for the Krebs cycle.
B) are alternatives for the pentose phosphate pathway.
C) use an organic molecule as a final electron acceptor.
D) occur only when oxygen is re

cuchillo   265   3 Replies

archie90

Which of the following have external structures containing a periplasmic space?

Which of the following have external structures containing a periplasmic space?

Which of the following have external structures containing a periplasmic space?
A) Gram-negative bacteria
B) Gram-positive bacteria
C) both Gram-positive and Gram-negative bacteria
D) archaea
E) eukaryotes

cuchillo   265   3 Replies

archie90

When the lagging daughter strand of DNA is synthesized, unreplicated gaps are fo

When the lagging daughter strand of DNA is synthesized, unreplicated gaps are fo

When the lagging daughter strand of DNA is synthesized, unreplicated gaps are formed on the parental DNA. Lagging strand synthesis fills these gaps by
a. synthesizing short Okazaki fragments in a 5´-to-3´ direction.
b. synthesizing multiple

arealhero   265   3 Replies

milestone23

For each molecule of glucose, how many ATPs are synthesized in fermentation?

For each molecule of glucose, how many ATPs are synthesized in fermentation?

For each molecule of glucose, how many ATPs are synthesized in fermentation?
a. 0
b. 1
c. 2
d. 3
e. 4

arealhero   265   3 Replies

milestone23

Gene expression

Gene expression

Gene etoh-1 is induced in yeast cells when treated with high levels of ethanol. A mutation in region 1 located in the upstream cis acting regulatory region of etoh-1 results in high-level RNA transcription, and a mutation in region 2 results in incre

juno1973   265   N/A

juno1973

Describe the cellular changes that occur during apoptosis.

Describe the cellular changes that occur during apoptosis.

Describe the cellular changes that occur during apoptosis.

barry   265   2 Replies

barry

How do you test sense receptors?

How do you test sense receptors?

Is it possible to test sense receptors on a dead animal or person, and if so, how would you go about testing the cutaneous sensors, taste buds, and olfactory sensors?

lemonsplk   265   2 Replies

ilibee

Adding mordent before doing next step in gram procedure?

Adding mordent before doing next step in gram procedure?

I added mordant before continuing with the next step in the gram stain procedure, the color of the gram positive cell is purple, but how about the color of the gram negative cell? Is it suppose to be the same? And what happens if I did declorization

nursing123   265   2 Replies

Lena

Which one of the following cells recognizes a cell surface complex consisting of antigenic peptide complexed w?

Which one of the following cells recognizes a cell surface complex consisting of antigenic peptide complexed w?

Which one of the following cells recognizes a cell surface complex consisting of antigenic peptide complexed with an MHC protein

A.phagocytes
B.Eosinophils
C.T cells
D.B cells
E.Natural killer cells

julesh22   265   1 Reply

juldina1

what is the significance, future and drawbacks of stem cell reaseach??

what is the significance, future and drawbacks of stem cell reaseach??

if you dont know about stemcells then what about cytokines,gene therapy or proteomics? what are their significance, future and drawbacks?? PLZ HELP MEEE!!

iloveapbio   265   1 Reply

Nursing01

What are the symptoms after a bacteriophage invades a cell?

What are the symptoms after a bacteriophage invades a cell?

What are the symptoms after a bacteriophage invades a cell?

zzwChris   265   1 Reply

smithgary

Which cells are highlighted?

Which cells are highlighted?

[html]

12

anthonydel117   266   14 Replies

Nica

As a result of the increase of testosterone at puberty for males:

As a result of the increase of testosterone at puberty for males:

As a result of the increase of testosterone at puberty for males:
A) osteoblasts increase the rate of bone resorption.
B) appositional bone growth increases.
C) intramembranous ossification increases.
D) epiphyseal plates widen r

Cali Fornia   266   2 Replies

Cali Fornia

All of the following are true of chronic fatigue syndrome EXCEPT

All of the following are true of chronic fatigue syndrome EXCEPT

All of the following are true of chronic fatigue syndrome EXCEPT
A) it is a psychological disorder.
B) it may be triggered by a viral infection.
C) it is also known as myalgic encephalomyelitis.
D) it often begins with flu-like

suo90821   266   3 Replies

segelloc

Which of the following statements about Reye syndrome is FALSE?

Which of the following statements about Reye syndrome is FALSE?

Which of the following statements about Reye syndrome is FALSE?
A) Symptoms may include vomiting, drowsiness, or behavior changes.
B) It mostly affects older adults.
C) It is associated with aspirin use.
D) Prolonged neurological

suo90821   266   3 Replies

skcusii

Toxoid vaccines, such as the vaccines against diphtheria and tetanus, elicit a(n)A) TC cell ...

Toxoid vaccines, such as the vaccines against diphtheria and tetanus, elicit a(n)A) TC cell ...

Toxoid vaccines, such as the vaccines against diphtheria and tetanus, elicit a(n)
A) TC cell response.
B) antibody response against these bacterial toxins.
C) dendritic cell proliferation.
D) immune complex.
E) antibody respo

suo90821   266   3 Replies

borque89

Biological transmission differs from mechanical transmission in that biological transmission

Biological transmission differs from mechanical transmission in that biological transmission

Biological transmission differs from mechanical transmission in that biological transmission
A) requires an arthropod.
B) works only with noncommunicable diseases.
C) involves specific diseases.
D) involves fomites.
E) requir

suo90821   266   3 Replies

skcusii

The reaction catalyzed by reverse transcriptase is

The reaction catalyzed by reverse transcriptase is

The reaction catalyzed by reverse transcriptase is
A) mRNA → cDNA.
B) tRNA → mRNA.
C) DNA → mRNA.
D) mRNA → protein.
E) DNA → DNA.

suo90821   266   3 Replies

segelloc

All of the following can be used to lyse cells except

All of the following can be used to lyse cells except

All of the following can be used to lyse cells except
A) lysozyme.
B) Triton-X.
C) sarkosyl.
D) guanidium isothiocyanate.
E) diethylpyrocarbonate.

tapey1996   266   3 Replies

de5iet

A noncompetitive inhibitor will (Multiple Choice Question)

A noncompetitive inhibitor will (Multiple Choice Question)

A noncompetitive inhibitor will
A) bind to free enzyme.
B) bind to free product.
C) decrease Vmax.
D) decrease Km.
E) both choices A and C

Astatine   266   3 Replies

virion

You wish to use mRNA profiles to examine the genes of a cell that are ultimately translated into pro

You wish to use mRNA profiles to examine the genes of a cell that are ultimately translated into pro

You wish to use mRNA profiles to examine the genes of a cell that are ultimately translated into proteins during times of stress. As a result, you are investigating a portion of the cell's
A) spliceosome.
B) genome.
C) proteome.

Astatine   266   2 Replies

Astatine

The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n) _

The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n) _

The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n) __________ group at the 5' end and a(n) __________ group at the 3' end.
A)  NH3; COOH
B) PO4; SO4
C) OH; H

Astatine   266   3 Replies

virion

Focal contact is associated with which of the following type of cellular junction?

Focal contact is associated with which of the following type of cellular junction?

Focal contact is associated with which of the following type of cellular junction? 
A) adhesive junction 
B) gap junction 
C) plasmodesmata 
D) tight junctions 
E) all of the above

Astatine   266   2 Replies

Astatine

What type of infection is candidiasis?

What type of infection is candidiasis?

What type of infection is candidiasis?
A) yeast
B) bacterial
C) viral
D) protozoan
E) spirochete

cuchillo   266   3 Replies

archie90

Which scientist coined the term antibiotic?

Which scientist coined the term antibiotic?

Which scientist coined the term antibiotic?
A) Fleming
B) Domagk
C) Kirby
D) Ehrlich
E) Waksman

cuchillo   266   3 Replies

archie90

If a high concentration of a particular nucleotide lacking a hydroxyl group at t

If a high concentration of a particular nucleotide lacking a hydroxyl group at t

If a high concentration of a particular nucleotide lacking a hydroxyl group at the 3´ end is added to a PCR reaction,
a. no additional nucleotides will be added to a growing strand containing that nucleotide.
b. strand elongation will proce

arealhero   266   3 Replies

milestone23

After the centromeres separate during mitosis, the chromatids, now called ______

After the centromeres separate during mitosis, the chromatids, now called ______

After the centromeres separate during mitosis, the chromatids, now called _______, move toward opposite poles of the spindle.
a. centrosomes
b. kinetochores
c. half-spindles
d. asters
e. daughter chromosomes

arealhero   266   3 Replies

milestone23

The basic structure of chromatin has sometimes been referred to as beads on a st

The basic structure of chromatin has sometimes been referred to as beads on a st

The basic structure of chromatin has sometimes been referred to as beads on a string of DNA. These beads are called
a. chromosomes.
b. chromatids.
c. supercoils.
d. interphases.
e. nucleosomes.

arealhero   266   3 Replies

milestone23

Diffusion is the net movement of particles from regions of _______ concentration

Diffusion is the net movement of particles from regions of _______ concentration

Diffusion is the net movement of particles from regions of _______ concentration to regions of _______ concentration.

arealhero   266   3 Replies

milestone23

Which of the following hormones increase(s) in concentration in the plasma durin

Which of the following hormones increase(s) in concentration in the plasma durin

Which of the following hormones increase(s) in concentration in the plasma during exercise?
A) cortisol
B) catecholamines
C) insulin
D) cortisol and catecholamines
E) cortisol, catecholamines, and insulin

colleen   266   1 Reply

padre

Someone help...

Someone help...

Prokaryotic and eukaryotic cells generally have which of the following features in common?
A) a membrane-bounded nucleus
B) a cell wall made of cellulose
C) ribosomes
D) flagella or cilia that contain microtubules
E) linear c

superclumsy   266   1 Reply

Doctor-2-B

What does action potential have to do with the transitting of signals?

What does action potential have to do with the transitting of signals?

I know the process of action potential (depolarization, then repolarization of a neuron), but I'm not sure how it helps to send messages along the nervous system. Any clarification is much appreciated. Thanks!

smiley13   266   2 Replies

jtw0019

What is the largest myelinated motor fiber in mammals?

What is the largest myelinated motor fiber in mammals?

What is the largest myelinated motor fiber in mammals?

smileyprincess111   266   2 Replies

darkshadow

How is information passed from beginning to end within a single neuron?

How is information passed from beginning to end within a single neuron?

I know it starts with an action potential and ends in a neurotransmitter release, but what's in-between?

Rima5879   266   3 Replies

Nurnin

Which resonance structure of phosphate is more stable and why?

Which resonance structure of phosphate is more stable and why?

Is phosphate; PO4^-3 more stable when it has P in the middle (formal charge of +1) and an oxygen on each side (formal charges of -1) or is it more stable when P has an expanded octet (no formal charge for P) with one of the oxygens double bonded (no

TotsMcgee   266   1 Reply

buglitter

A patient has fever, difficulty breathing, chest pains, fluid in the alveoli, and a positive ...

A patient has fever, difficulty breathing, chest pains, fluid in the alveoli, and a positive ...

A patient has fever, difficulty breathing, chest pains, fluid in the alveoli, and a positive tuberculin skin test. Gram-positive cocci are isolated from the sputum. The patient most likely has
A) pneumococcal pneumonia.
B) mycoplasmal pneum

suo90821   267   3 Replies

segelloc

You advise your pregnant friend to give her cat away because she could contract

You advise your pregnant friend to give her cat away because she could contract

You advise your pregnant friend to give her cat away because she could contract
A) toxoplasmosis.
B) plague.
C) Brukitt’s Lymphoma
D) infectious mononucleosis.
E) listeriosis.

suo90821   267   3 Replies

Luichen

The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?

The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?

The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?
A) phase 1 
B) phase 2
C) phase 3
D) initial phase
E) asymptomatic phase

suo90821   267   3 Replies

montgomery

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are cells able to incorporate these molecules?
A) These macromolecules are only incorporated into structures outside the membrane.
B) Macromole

Astatine   267   3 Replies

Lilligant