Cell Biology

3 years ago

Mitosis and meiosis

If 2n = 28, how many DNA molecules does a cell have in the prophase of mitosis, the metaphase of meiosis one, the prophase of meiosis two and the metaphase of meiosis two?

Dzano 267 3 Replies

3 years ago

Does dasatinib damage DNA further?

Does dasatinib damage DNA further or does it just kill off cancer cells and cells whose DNA has been damaged?

CarbonRobot 220 1 Reply

3 years ago

How to correctly subculture a colony in liquid medium

Dear all,

I've obtained a freeze-dried sample of Komagataeibacter xylinus from DSMZ (German equivalent of ATCC). According to the provided instructions, I will revive the culture in 1000ml of liquid medium. The colony will stay

Pono 217 1 Reply

alpheratz

3 years ago

If human CD8T cell was injected intravenously into someone could it destroy their orexin receptors?

It seemed to have worked in mice.

It seems like CDT worked its way into the mouse’s brain and destroyed the orexin receptors. Could this happen in humans too? Destruction of orexin receptors is what is believed to cause narcolepsy.

Kait Limberg 260 3 Replies

3 years ago

Hypothetical! What would occur if HIV were introduced to a patient with leukemia?

Do expect one to overhwelm the other? Compound issues? Balance one another?

Nathan Niezgoda 192 1 Reply

3 years ago

Does anyone know of any lab-created transmisible auto immune disorders?

Auto immune disorders can arise following stress or exposure to harmful material, so has there been any research into manmade autoimmune disorders?

Nathan Niezgoda 207 1 Reply

3 years ago

What are secretory grains?

what is the difference between secretory vesicles and secretory grains?

Describe the secretory grains

Fipuś 194 1 Reply

sholey

3 years ago

What causes a bacterial culture to enter the stationary phase?

What causes a bacterial culture to enter the stationary phase?

a. Harmful changes in pH

b. Overabundance of nutrients

c. Intense metabolic activity involving synthesis of enzymes and various molecules

Charlie Lem 167 1 Reply

queenmeg

3 years ago

The first monoclonal antibody drug (Orthoclone OKT3) was developed in ________.

The first monoclonal antibody drug (Orthoclone OKT3) was developed in ________.

A) 1896
B) 1936
C) 1986
D) 2010

beaches411 208 1 Reply

3 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 196 1 Reply

3 years ago

Mechanisms of CD4+ lymphocyte depletion in HIV

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

Steve8530 215 1 Reply

3 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 265 4 Replies

CarbonRobot

3 years ago

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

barry 867 2 Replies

CarbonRobot

3 years ago

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

flagella
cilia
lemellipodia
microvilli
stress fibers

Hrishikesh Baburaj 211 1 Reply

3 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 213 1 Reply

sunnywwang

3 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 228 1 Reply

3 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 248 1 Reply

3 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 314 6 Replies

3 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 2657 1 Reply

3 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 4970 1 Reply

3 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 2947 1 Reply

3 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 268 6 Replies

Juntao Li

3 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 364 3 Replies

3 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 699 14 Replies

Rose_

3 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 453 3 Replies

3 years ago

The polarity of a DNA strand refers to that fact that______

the two ends of the strand have different chemical groups.

camac123 1278 1 Reply

3 years ago

Cellular Malfunctions?

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

CarbonRobot 347 3 Replies

3 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 274 1 Reply

3 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 287 2 Replies

3 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 411 5 Replies

Woo

3 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 380 2 Replies

Ari88

3 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 3064 8 Replies

jasdnj

3 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 401 2 Replies

CarbonRobot

3 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 628 5 Replies

3 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 310 1 Reply

3 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 478 2 Replies

Amanda387

3 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 330 4 Replies

Amanda387

3 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 406 2 Replies

Amanda387

3 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 331 1 Reply