What is the difference between memory T cells and cytotoxic T cells?   Memory T cells need more regulatory cell interactions to become active. Cytotoxic T cells live longer. Memory T cells do not need to interact with antigen-presenting cells to become activated. More cytotoxic T cells than memory T cells are activated during a second exposure to an antigen.

Q: How do the small molecules pass through the outer membrane of mitochondria? * a) ATP pump b) Carrier...

A: The double membrane bound,  granular,  oval, thread like or stalk like cell organelle  that is invol...

Q: Virulence factors allow microbes to be pathogens. This means that a bacterium with more virulence fa...

A: Option c  Can more easily infect hosts and cause disease. Virulence is defined as the degree of path...

Q: If a component is heat sensitive, how might you conveniently achieve sterility of that medium? a. f...

A: Option A i.e. filtration

Q: You are lovely little gene which makes the actin protein (the cytoplasmic cytoskeleton protein). You...

A: Introduction: Gene is a unit of heredity. It contains the genetic information. It is made up of DNA....

Q: The human population was 6.0 billion in 1999 and has been growing ~ exponentially with an intrinsic ...

A: Introduction: A population is all the organisms of the same group or species, which live in a partic...

Q: If a parasite’s life cycle involves multiple hosts, what might control the population dynamics of th...

A: As per the guidelines, we are supposed to answer only one question. Since you have asked multiple qu...

Q: 8. All of the human cells have the same 46 chromosomes, so they have the same genes so how do differ...

A: Answer 

Q: Attempt to seamlessly integrate the quotation into the text by using a signal phrase or structuring ...

A: a signal phrase can be used to tell the readers that a quote is coming which is in relation to the t...

Q: Genetic engineering has been a debatable topic in science as many people are only aware of its risk ...

A: The correct answer for this question is - b) II,III and VI  Explanation : We can divide the giving o...

Q: What is the difference between Roux-en-Y gastric bypass and sleeve gastrotectomy?

A: Introduction: Gastric bypass and other weight-loss surgeries like gastric sleeve, roux-en-Y gastroje...

Q: In a plant, green is dominant over white leaf; long is dominant over round shape. a. How many total ...

A: Alleles are the alternative forms of a gene that are located on the same locas of a homologous chrom...

Q: What would happen if a woman took supplemental estrogen and progesterone beyond the 21st day of her ...

A: Answer :- If a woman took supplemental estrogen and progesterone beyond the 21st day of her menstrua...

Q: What is the theorized origin of these organelles and what is the name of the Scientific Theory that ...

A: Chloroplast are the site of photosynthesis in green plants. It consists of three layers which are ou...

Q: Which of the following statements is correct?   a. Arteries carry blood away from the heart and vein...

A: The blood circulatory system, is a system of organs that consists of the heart, blood vessels (arter...

Q: If a chimpanzee has a haploid (N) chromosome number of 24, how many chromosomes will be found in its...

A:   A chimpanzee has 24 pairs of chromosomes in diploid condition.  In haploid condition such as in ca...

Q: Which of the following has an incorrect association?   a. Plasma- water, nutrients and wastes   b. W...

A: A human body is a synchronized coordination of a number of physiological process. These physiologica...

Q: Explain why improvement seen in diabetes in some type of bariatric surgery is independent of weight ...

A: Bariatric surgery or weight loss surgery is a surgery done in digestive system to promote weight los...

Q: Activity 3: Short Essay Directions: Choose two questions to answer. You may use a separate sheet to ...

A: Vitamins are important for normal growth and development. There are two types of vitamins, based on ...

Q: what is the biological significance of the different DNA base sequence?

A: The nucleic acids act as genetic material for living beings. The two different nucleic acids are DNA...

Q: Discuss “Seeds are the foundation of agriculture”

A: Answer : seeds are the basic products needed in the agriculture as seeds are the embryo of the plant...

Q: Define what it means to be conscious.

A: Conscious is a Latin term that means "to know" or "to be aware." As a result, a conscious individual...

Q: In the hawk-dove game, at what value of c do doves and hawks have equal payoffs when hawks are extre...

A: ANSWER;- In the hawk-dove game, doves and hawks have equal payoffs if c=0.  

Q: Using the information from the DNA-DNA hybridization data table below, build a phylogenetic tree tha...

A: The lines in Phylogenetic tree describe the evolutionary descent of different species, organisms, or...

Q: Viruses are cellular organisms. * True False An amino acid is an amphoteric molecule. True O False R...

A: Cell is the basic structural and functional unit of living organisms.Cell contains cytoplasm enclose...

Q: Derive the gametic ratio of the second parent using branching method in AabbCC x AABbCc

A: AabbCC x AABbCc is a trihybrid cross where 3 types of alleles present.

Q: A man with blood type O (genotype ii) has a father with blood type A and a mother with blood type B....

A: In human blood group typing, the ABO system of blood grouping is used.  The Blood groups are A, B, A...

Q: Coronavirus

A: coronaviruses  are a large family of viruses that cause illness ranging from the common cold to more...

Q: Why does the Tasmanian devil immune system not fight off the foreign cells that cause Devil Faci. O ...

A: Due to low levels of genetic diversity, devils frequently share the same MHC antigens as the DFTD tu...

Q: What are bacteriophages?

A: Bacteriophages are type of virus which infect bacteria .Bacteriophages are first observed in 1915 by...

Q: Please don't copy holding a population of microorganisms (having a z value of 19 ᵒF) at 231 ᵒF for o...

A: Answer :: Holding a population of micro organisms having a z value of 19° F at 231°F for one minute....

Q: Assume that you had plated your +PGLO culture on an LB agar plate. What result (number of colonies) ...

A: +pGLO culture is a type of bacteria that has been genetically modified to produce a fluorescent prot...

Q: What is the inactivation of the X chromosome? What is a Barr body?

A: Chromosomal disorder caused due to absence or excess or abnormal arrangement of chromosomes. During ...

Q: an isotonic concentric contraction, muscle length shortens muscle tension exceeds the force of the l...

A: Concentric and eccentric isotonic contractions are the two forms of isotonic contractions. The muscl...

Q: What is the type of genetic inheritance of color blindness? Is color blindness more frequent in men ...

A: Colour blindness is a condition in which a person is incapable to see colours normally. Colour blind...

Q: Make a list of what image faults one may encounter in radiology and list what the reason for this fa...

A: Radiology imaging: In radiology, the images of different body parts are recorded which are analysed ...

Q: What are the effects of deforestation on CO2 concentrations in the atmosphere?

A: Introduction: Deforestation is the excessive cutting of trees to clear the land area and using that ...

Q: If a theoretical plant grew in an arid waterless environment, give a probable description of the typ...

A: Description of a theoretical plant growing in arid waterless environment. Leaves are either very sm...

Q: All the genetic variation seen in the human population, passed from generation to generation, arose ...

A:   INTRODUCTION         Genetic variation is a mainly designated to determine the variation that occu...

Q: a. genotype of the parents b. Punnett square C. genotypic ratio d. phenotypic ratio

A: Here, based on the data given in the question Parents genotypes and phenotypes:- HhFf X HhFf (Widow'...

Q: What are bacteriophages?

A: The term bacteriophage means "bacteria eater"  since they are only viruses that infect bacteria and ...

Q: Differentiate a neoophoran turbellaria from a  archoophoran turbellaria.

A: Platyhelminthes are flatworms that are acoelomate, simple nervous system, do not have a circulatory ...

Q: A drug forms a channel in the thylakoid membrane. Given this scenario, which of the following statem...

A: *chloroplast is the major site in plants that perform photosynthesis. * Chloroplast consists of   C...

Q: Why are bacterial spores not considered to be true reproductive bodies like the spores of yeasts and...

A: A spore is a reproductive cell capable of developing into a new individual without fusion with anoth...

Q: Explain why our epithelial tissue heals more rapidly than other types of tissue

A: Epithelial tissue is present in the outer surface of the body and also lines the body cavity. 

Q: The gene for the primase enzyme is mutated and is nonfunctional. What is the result of such a mutati...

A: The process associated with the duplication of genetic material or DNA can be described as replicati...

Q: Venous blood pressure is equal to 6-8 O 20 3-7 12/8

A: Introduction Venous Blood Pressure:- It is the average blood pressure within the venous compartment ...

Q: Why the secretion of gut hormone in adjustable gastric banding (AGB) is mainly considered to be due ...

A: Introduction:Gastric banding is a weight-loss surgery performed laparoscopically. A band is wrapped ...

Q: TRNA has peptidal transferase activity. 1 point True False Genetic information stored in mRNA 1 poin...

A: Q. tRNA has peptidal transferase activity. True False   Q.Genetic information stored in mRNA is tran...

Q: This diagram shows a parental cell going through meiosis and producing 4 daughter cells. Which cel m...

A: Introduction A parent cell divides into two or more daughter cells in the process of cell division. ...

Q: Imagine a friend tells you that humans are naturally aggressive, "just look at chimpanzees." Questio...

A: Introduction: The ancestors of Mammals belong to Therapsida as there are various similarities seen i...