dieulinhnguyenle14

Which cell has the smallest electrical potential across its membrane?

a.A cell with a membrane potential of -100 mV

b.A cell with a membrane potential of +40 mV

c.A cell with a membrane potential of +4 mV

d.A cell with a membrane potential of -6 mV

What is monoclonal antibody? How do you use a monoclonal antibody to detect if a patient is infected by specific strain of flu virus by ELISA? If a patient got a flu shot against this strain of flu virus three weeks ago, how will that affect your result?

In one complete sentence explain why PCR is a chain reaction.

The removal of top soil by water or wind is called

A Soil erosion

B Soil wash

C Silting of soil

D Soil creep

How will controlling soil erosion address the problem of widespread food insecurity? discuss 2 or 3 other possible actions that can be taken to reduce the number of people who are currently food insecure. How can the creation and maintenance of roads help alleviate the problem?

GMO

What possible negative effects could there be on the environment?

Might economic pressures (for example, in countries where a significant proportion of the population is food-insecure) outweigh the environmental concerns in some countries but not others?

What are current regulations in U.S. about production and labeling of GMOs? What are current regulations in other countries?

Bicoid protein is encoded by an autosomal gene and is essential to the development of the anterior part of Drosophila embryos. In the absence of bicoid protein embryos are headless! You cross a male fly in which both bicoid alleles are non-functional (bcd^-/bcd^-) to a female that is heterozygous for the mutant allele (bcd^-/bcd⁺). In case you’re wondering, they both have heads.

a) How is this even possible: how does this mutant male have a head?

b) What fraction of embryos from this cross will have heads?

1) Which of the following about combinatorial control is false?

Which three major proteins are found in egg white? Out of these three proteins, which protein requires lower ionic strength and higher ionic strength to precipitate out?

why is including age structure in models important to determine population growth?

What happens to a lizard's metabolic rate when the temperature increases 10 Celcius?

A.) The metabolic rate stays constant B.) The metabolic rate approximately doubles C.) The metabolic rate approximately triples D.) The metabolic rate approximately quadruples

Ultraviolet (UV) visual sensitivity in animals has implications for mate choice, social signaling, prey detection, and foraging in general. Research into the genetic basis of the ability to detect ultraviolet light reveals that:

Select one:

a. this ability is the product of complex interactions among many gene loci.

b. sensitivity to UV appears to involve a single amino acid substitution in a visual pigment molecule.

c. the relative rarity of UV sensitivity among animals is attributable to the fact that multiple modifications of the visual pigment molecule promoting UV sensitivity are necessary to allow the detection of high-energy light.

d. UV-sensitive organisms are all descended from a common ancestor.

e. where genes coding for visual pigment molecules become integrated, they can vastly extend the spectrum of the photosensitive pigment produced.

Glycans that are conjugated to lipids or proteins play roles other than as energy store in cells. With use an example for each, suggest the cellular localizations of glycocolipids and glycoproteins and biological functions of the glycan moieties of these glycoconjugates.

I have just an intuition that the carbohydrate part ofglycoproteins help them to fulfil those tasks like in plasmamembranes. You can also get many more receptors if you can usecarbohydrates too.

For instance, glycoproteins are necessary in recognising whiteblood cells. Antibodies are examples of glycoproteins. So they playa crucial role in our innate and adaptive immunity: MHC interactionwith T cells in adaptive immunity. Other examples: necessary inplatelet aggregation and adherence, components of zona pellucidaand connective tissue. Some hormones are also glycoproteins sonecessary in humoral adaptive immunity: FSH, LH, TSH and EPO.

But why glycoproteins are "better" than proteins withoutcarbohydrates moiety in fulfilling biological tasks?

I still see that both are important, but why the one is betterthan the other one.

In other words: Are there any biological tasks that onlynon-glycoproteins can fulfil, not glycoproteins? Arenon-glycoproteins necessary in some essential biological tasks?

I think the answer to the last two questions is "yes", so whywould one say that glycoproteins are better in fulfillingbiological tasks than non-glycoproteins.

GIve the ploidy (haploid diploid or triploid) of the following parts of the life cycle:

sperm nuclei-

zygote-

cells which make up the cotyledon cells of endosperm after double fertilization-

each polar nuclei

sepal cells of the flower

endosperm

pollen grain tube nucleus

cells which make up the ovary

cells which make up the seed coat

leaves on the mature plant

cells which make up the fruit

megaspore

microspore mother cell

Which of the following cells does not have the same ploidy level as the megaspore and microspore? Select one: a. Antipodal cell before fertilization b. Endosperm cell after fertilization c. Generative cell d. Synergid e. Tube cell

Microbiology

A nurse stops by a new patient’s room and observes a sign outside the door indicating that a disposable mask and gown should be worn in addition to latex gloves when caring for this patient. What are the two broad categories of patients that would require this extra step, and who is this gear designed to protect in each category?

Explain how clonal selection contributes to the development and expansion of antigen specific lymphocytes that do not respond to self.

1. What is the relationship between the genetic defect in CF and the microbiological complications associated with the disease? Why are CF patients predisposed to pulmonary infections?

Microbiology: A Systems Approach 5^th Edition. Cowan et al. 2017. McGraw-Hill Publishing.

Can be any pathogen

Explain in details the 3 characteristic of occupational carcinogens namely: 1) genomic 2) electrophilic 3) genotoxic

1) What is a tumor?

A) List and briefly describe 5 characteristics of a tumor (or tumor cells) as contrasted with the corresponding normal tissue (or cells).

B) What is the defining characteristic of a malignant tumor as opposed to a benign tumor?

C) How do these characteristics support the theory that carcinogenesis is a multistage (i.e. that more than one step occurs during the development of cancer)? Can you suggest a way that one one genetic (or epigenetic) alteration could lead to multiple characteristics of a tumor (hint: consider pleiotropy):

You would expect a halotolerant microbe to grow best on the 0.5% NaCl plate but possibly grow on the 5% NaCl plate.

Select one:

True

False

what could explain the migration of a protein in a gel at 100kD, when by DNA sequencing, the protein should be 60kD?

A 51-year-old woman complained to her family practitioner that she had felt very fatigued for several weeks. She had lost 7–10 pounds in weight over the previous month. On physical examination the physician discovered a firm nodular swelling, about 3–4 cm in diameter, in the left breast that was anchored in tissue several centimeters beneath the skin.

Questions:

1. To which additional areas of this woman’s body should the physician direct special attention during the physical examination and why?

2. Which muscle should be caused to contract in order to demonstrate the fixation of the swelling?

3. Following surgical removal of the swelling and exploration of the axilla, the patient is found to have a winged scapula. How has this occurred?

4. Following surgery, she noted a swollen left arm. Why?

In chickens, the beaks can be yellow, blue & green. Chickens with green beaks have an increased value. What is the type of dominance in this problem?

California and New Jersey both have laws outlawing “gay conversion” therapy for minors, which attempt to “convert” homosexuals into heterosexuals. The rationale for the law is that (1) homosexuality isn’t an illness and (2) the treatment itself may harm patients, increasing their risk for depression and suicide. Still, some practitioners objected that any such restriction represented an illegal restraint on trade, preventing them from offering their patients certain services. And some parents objected that they were prevented from seeking treatment in the best interests of their children. In New Jersey, one set of parents sued on behalf of their 15-year-old son, who said that he wanted the treatment. Comment on any aspect of this issue from the perspective of scientific psychology. Should providers be able to provide any treatment to their patients, so long as the patients understand the risks involved?

In chickens, the beaks can be yellow, blue and green. Chickens with green beaks have an increased value. What is the type of dominance in this problem?

Two short tailed (Manx) cats are bred together. They produce 3 kittens with long tails, 5 kittens with short tails and 2 kittens without any tails.

1) What is the type of dominance in the problem?

2) Is it monohybrid or dihybrid cross?

The K+ concentration inside a neuron differs from that outside the neuron. Considering the systems inside and outside the neuron as half-cells of a concentration cell, calculate the difference in electric potential required for the K+ concentration inside the neuron to be 45 times greater than outside the neuron. Assume that the potential difference is due only to the K+ concentration difference.

compose a song or poem to describe a cell biology on your choice.think about how would explain a process to someone with no biology background, such as a young child

What are the main considerations when making a recombinant gene product?

Most clinical EEG machines use 19 amplifier channels to measure signals from 19 electrodes arranged according to the standardized 10-20 system.

Why clinicians want to examine 19 channel signals, what else can you get out of it?

How do diversity factors in an ecosystem work together to produce the diversity and evolutionary differentiation?