Cell Biology

2 years ago

Why the immune system to be able to respond with different classes of antibodies to different pathog

Why is it important for the immune system to be able to respond with different classes of antibodies to different pathogens?

Marcus 155 1 Reply

2 years ago

Mechanisms of CD4+ lymphocyte depletion in HIV

Name 3 mechanisms of CD4+ lymphocyte depletion in HIV infection ?

Steve8530 177 1 Reply

2 years ago

Bad mutations VS good mutations.

It is my understanding that when DNA mutates whether from stress, chemicals, or ionizing radiation the result is usually negative or neutral. If DNA mutations are unavoidable is there any evidence that anything would promote a mutation to be benefici

CarbonRobot 219 4 Replies

CarbonRobot

2 years ago

Discuss the ethical and societal reasons for and against germ-line gene therapy.

barry 817 2 Replies

CarbonRobot

2 years ago

Actin bundles give shape and support to ________ found in intestinal mucosal cells.

flagella
cilia
lemellipodia
microvilli
stress fibers

Hrishikesh Baburaj 153 1 Reply

2 years ago

What will happen to the physical structures of a flower if multiple insertions in its petal happened

In genetics, an insertion (also called an insertion mutation) is the addition of one or more nucleotide base pairs into a DNA sequence. This can often happen in microsatellite regions due to the DNA polymerase slipping. An insertion changes the DNA s

Sophia Agustin 166 1 Reply

sunnywwang

2 years ago

The inherited disorder xeroderma pigmentosum causes extreme sensitivity to the sun because of ...

The inherited disorder xeroderma pigmentosum causes extreme sensitivity to the sun because of defects in the ________ pathway.

Fill in the blank with correct word.

daniellelady 189 1 Reply

2 years ago

The movement of proteins and lipids from the ER to their appropriate locations within a cell is ...

The movement of proteins and lipids from the ER to their appropriate locations within a cell is known as ________.

Fill in the blank with correct word.

bu2fusul 182 1 Reply

2 years ago

The localization of this enzyme is only factor that creates the difference between 2 daughter cells

I have a assignment. It is illustrated like this,

There is a cell that has a localized intracellular enzyme. It divides into two distinct characteristic daughter cells. However, there is only one of the daughter cells gets the enzyme produ

anna_lee 240 6 Replies

2 years ago

Penicillin does not directly kill bacteria. Why do cells usually die in the pres

Penicillin does not directly kill bacteria. Why do cells usually die in the presence of penicillin?

barry 2567 1 Reply

2 years ago

List two examples of biotechnology that involve recombinant DNA technology and t

List two examples of biotechnology that involve recombinant DNA technology and two examples that do not.

colleen 4890 1 Reply

2 years ago

Describe how the properties of phospholipids make these molecules well suited fo

Describe how the properties of phospholipids make these molecules well suited for plasma membranes.

colleen 2859 1 Reply

2 years ago

Can chichenpox infection elevate the levels of cells?

This problem originates from USABO 2017 Semifinal #10 question.

I thought it should elevate the level since it's a viral infection, then there should be more white cells gathering around the lesion. But the answer says otherwise. I wa

Juntao Li 190 6 Replies

Juntao Li

2 years ago

Desrcribing Tririchomonas Foetus

Hello guys.
I have a homework and I'm having some problems. This picture of a cell Tririchomonas Foetus was taken by TEM microscope and I'm supposed to describe it's organels such as nucleus, flagella, kinetoplast, mitochondria, m

Biologie juu 289 3 Replies

2 years ago

What percentages salt solutions should I use when performing an osmosis experiment on naked eggs?

Hello.,

I am currently in the midst of performing an experiment for my (AP) biology class. The project focuses on the concept of osmosis, using a scale-less egg (‘naked egg’) and different NaCl-solutions.
My teacher has already look

1 2

Eva R 599 14 Replies

Rose_

2 years ago

Lymphocytes Variability?

If a middle aged person had their lymphocyte total measured and they were healthy, how much range are they likely to have? I don't mean a reference range used for everyone. If for example their total was tested as X, if they got retest the next

CarbonRobot 379 3 Replies

2 years ago

The polarity of a DNA strand refers to that fact that______

the two ends of the strand have different chemical groups.

camac123 1210 1 Reply

2 years ago

Cellular Malfunctions?

Other than cancer and senescence, what other cell mishaps happen as a result of DNA damage?

CarbonRobot 267 3 Replies

2 years ago

Can you identify the banding patterns predicted by each model after the first round of replication?

Part B - Experimental results: Banding pattern predictions for each model of replication
Meselson and Stahl designed an experiment that would allow them to discern whether DNA replication occurs in a dispersive, semiconservative, or conservative

1 2 3

bdelgado26 82366 32 Replies

dziubmad

2 years ago

Experimental elongation of telomeres

Hi. Can you help me to find some articles/publications related to experimental elongation of telomeres.
I heard, that for such purposes biologists use viruses. So I believe to find some articles, where I can read about this viruses and about mec

Mbizeps 189 1 Reply

2 years ago

How to obtain more bacteria culture from already developed colony in HS medium

I have a freeze-dried lab sample of pure Gluconacetobacter Xylinus (form. Acetobacter Xylinum). I am about to grow this colony of bacteria in a standard Hestrin and Schramm medium (HS) of 1000ml volume. This will allow me to run 10 diff

Pono 224 2 Replies

2 years ago

Do chloramphenicol and/or sanitizer inhibit growth of Lactobacillus or Streptococcus thermopilus ?

I did an experiment with tryptic soy agar medium recently and I had some issues so I need a few questions answered. The experiment was to use a TSA plate and first streak for isolation with yogurt in order to get a culture of Lactobacillus or Strepto

Ari88 304 5 Replies

Woo

2 years ago

What can I do if I accidentally got boiling water in my Phenyl-ethanol alcohol agar?

I'm doing a series of at-home microbiology labs that are due next Monday. I'm on the last lab (#5) which uses three TSA plates and the PEA plates as medium. I had my PEA agar in a pot, immersed partially in water, on the stove in order to h

Ari88 271 2 Replies

Ari88

2 years ago

Molecular Biology

So, I am having a difficult time with a question. The question and the figure is attached. This is what I think about it so far, but I am really confused and need help.

A) When the preincubation was carried out with the individual template

ChelsM 2943 8 Replies

jasdnj

2 years ago

Why aren't cone and rod cells more alike?

Is there that much different between rods and cones? I think rods lack maybe 80nm from the upper range of the red cones but otherwise covers the cones wavelengths well. Cones give fine detail and color vision, but rods are like 200 times more sensiti

CarbonRobot 297 2 Replies

CarbonRobot

2 years ago

DNA Change over a lifetime.

How much does our DNA change over a lifetime? I think there might of been a study in 2008 that said maybe 20% in 18 years? If our DNA can change that rapidly how come we aren't giant tumors before 50? I'm told even small simple changes can

CarbonRobot 493 5 Replies

2 years ago

Each photosystem is composed of several hundred higher energy molecules

Each photosystem is composed of several hundred higher energy molecules
They are called _____________________________ __ because they collect and channel energy to the ___________________________
Accessory pigments can be molecules of chloro

Abdulrahman Alhussami 239 1 Reply

2 years ago

After a period of exercise, a person will breathe heavily for some time after the activity has ...

After a period of exercise, a person will breathe heavily for some time after the activity has ceased. What is happening during this time as the oxygen debt is being paid?
A) Glycogen stores are being regenerated.
B) Creatine phosphate is b

lisa_lordes 425 2 Replies

Amanda387

2 years ago

Rhodobacter cells perform photosynthesis in the presence of light and grow heterotrophically in the ...

Rhodobacter cells perform photosynthesis in the presence of light and grow heterotrophically in the dark. After being cultured in total darkness for multiple generations, phenotypic and genotypic changes occur. What phenotypic changes occur and what

felipebelt 259 4 Replies

Amanda387

2 years ago

The protozoan Didinium feeds on other organisms by engulfing them. Why are bacteria, in general, ...

The protozoan Didinium feeds on other organisms by engulfing them. Why are bacteria, in general, unable to feed on other cells in this way?

What will be an ideal response?

efi 310 2 Replies

Amanda387

2 years ago

The energized electrons are quickly absorbed by an electron acceptor called “____” embedded in ...

The energized electrons are quickly absorbed by an electron acceptor called “____” embedded in the ____________________ membrane
The electrons lost by the chlorophyll A molecule in the reaction center of the Photosystem II are immediately ______

Abdulrahman Alhussami 246 1 Reply

2 years ago

Some chlorophyll and accessory pigments are grouped into two types of light gathering complexes ...

Photosystems
Some chlorophyll and accessory pigments are grouped into two types of light gathering complexes called ____________________ ___________ (PSII) and ______________ ____________ (PSI)
These light gathering complexes are embedded i

Abdulrahman Alhussami 229 1 Reply

miks

2 years ago

A(n) _____ is a spur-of-the-moment question. Fill in the blank(s) with correct word

Abdularhman 237 1 Reply

2 years ago

A(n) _____ is a spur-of-the-moment question. Fill in the blank(s) with correct word

Chlorophyll
Although there is only a slight difference in the ___________________________ of Chlorophyll A and B, Chlorophyll A is located in the __________________________ where radiant energy is transferred for the production of energy carrier

Abdulrahman Alhussami 241 1 Reply