If gene transcription is inhibited after fertilization, development past the two-cell stage does not take place in the mouse. However, in frog embryos, this treatment does not disrupt development until late cleavage. Explain this difference.
Q: On a world wide basis, which animal produces the second greatest amount of milk for human…
A: Mammals (females) have well developed mammary glands that helps in provide nourishment to the…
Q: excitatory and 15 inhibitory postsynaptic potentials appear simultaneously on the plasmatic membrane…
A: EPSP is the excitatory postsynaptic potential. This is the graded potential whose function is to…
Q: Define and describe the histology of the: a. neuron, b. glia and glial fibers c. Nissl substance, d.…
A: Since, multiple questions have been asked which are unrelated, only first question will be answered.…
Q: neisseria gonorrhoeae attached to the mucosal epithelium and causes infection by phagocytosis lysis…
A: Neisseria gonorrhoeae, the bacterium responsible for gonorrhea, initiates infection by interacting…
Q: owing in styles after controlled hand-pollinations in which the two species served as pollen donor…
A: Microsporangia is the male reproductive organ in the plant where the formation of pollen tube takes…
Q: Hair color is determined in Labrador retrievers by alleles at the B and E loci. A dominant allele B…
A: The interaction between alleles at the B and E loci affects the pigmentation of their hair colour.…
Q: You are analyzing the intracellular DNA intermediates formed during the replication of the…
A: The provided experimental results involve the analysis of DNA intermediates in wild-type and mutant…
Q: Recommended tool for a plant protein (Scansite, NetPhos, GPS)
A: Bioinformatics is the field of biology that deals with the application of computational,…
Q: Explain ; Chemoreceptors Stretch receptors Thermoreceptors
A: Sensory receptors are trained to recognise specific types of stimuli. They transform the stimulus…
Q: Why is the transport of glucose from the lumen of the small intestine to the bloodstream considered…
A: Cells move molecules across the membranes they have by a process known as secondary active…
Q: A cloned Bam HI DNA fragment, 3.0 kb long, was isolated in preparation for sequence determination.…
A: Restriction mapping is done by analysing and arranging the fragments that are generated by the use…
Q: Ryanodine Receptor (RyR) SERCA (SR Ca2+ ATPase) Voltage-gated Na+ channels Actin Myosin…
A: The excitation-contraction coupling process refers to the sequence of events that links the…
Q: Inheritance of snapdragon flower color shows a pattern of incomplete dominance. Crosses between…
A: Genetic qualities are passed down through inheritance from parents to their kids, who receive all of…
Q: (iii) Comment on the passage number of A and B cells. State your reasor (iv) Other than the passage…
A: TERT stands for telomerase reverse transcriptase and TR stands for telomerase RNA. TERT plays an…
Q: what is the rationale/literature review in conservation status of fish BARNARD’S ROCK CATCFISH…
A: Freshwater fish species in the Austroglanididae family include the Barnard's Rock Catfish…
Q: Which community has the highest species diversity according to the Shannon Index? Community 2…
A: Species richness is defined by the number of species in an area. It does not takes into account the…
Q: The coefficient of relatedness for the population of Great Brittan is 0.015. What is the risk of…
A: The degree of consanguinity (or biological relationship) between two people is measured by the…
Q: Task 5 of 6 (AC 2.2) (150 words) A clinician recorded the blood pressure of a 38 year old female…
A: An essential physiological measurement, blood pressure represents the pressure that flowing blood…
Q: True or false Explain your answer Measuring turbidity of a cell culture with optical density (OD)…
A: The technique through which cells are cultivated under controlled circumstances, often away from…
Q: What is biology
A: Science is defined as any defined knowledge system that deals with the physical world and its…
Q: QUESTION 2 ‘’Viruses cannot be grown in standard microbiological culture such as broth and agar.…
A: Studying viral behavior, developing vaccines, and performing diagnostic tests are all made easier by…
Q: A molecule that is oxidized... a) captures light energy Ob) accepts electrons Oc) reacts only with…
A: Oxidation is a chemical process in which involves the loss of electrons from a substance. A…
Q: A. Describe in complete sentences how the requirement of a PAM sequence affects the flexibility of…
A: To make specific changes in organism's DNA scientific found a method, this method is known as gene…
Q: 12. Solubility of the Components of DNA Draw the following structures and rate their relative…
A: DNA, the genetic material of living organisms, consists of various components such as phosphate,…
Q: Bacteriophage entry into a host cell involves: a) Endocytosis b) Membrane fusion c) Direct injection…
A: A bacteriophage, commonly referred to as a phage, is a type of virus that specifically infects…
Q: A naked (non-enveloped) virus ONLY has a/an O nucleocapsid O envelope O antigenic surface O caporite…
A: The viruses are classified as both living as well as non-living. When they are present outside of…
Q: 24. Only 30% of adult humans can hydrolyze lactose. Unlike their lactose-intolerant fellow humans,…
A: The ability to digest lactose, the sugar found in milk, varies among adult humans. Approximately 30%…
Q: 7. (a) Present the Monod equation in the given space below and define each of the terms (e.g., μmax,…
A: The Monod equation is a mathematical model that describes the growth rate of microorganisms as a…
Q: Where is the photopigment chlorophyll a located in Cyanobacteria? a) in chloroplasts O b) embedded…
A: 1- Cyanobacteria, also called "blue-green algae," are the photosynthetic bacteria.2-They contain…
Q: Ferns are a type of terrestrial plant that does not produce seeds, unlike gymnosperms and flowering…
A: The ability to produce seeds has provided significant advantages to gymnosperms and flowering plants…
Q: Which restriction enzyme is best suited for cloning in pUC8?
A: The restriction enzymes are specific endonuclease that cut the double stranded DNA from the middle…
Q: High altitude is an example of what type of stress that requires adaptation on the part of the…
A: In a challenging environment, adaptation towards stress plays an important role in survival in…
Q: a) What is the highest level of protein structure exhibited by the ACh receptor? b) An experiment…
A: Neurotransmitters are endogenous chemical molecules that are produced by neurons of the brain to…
Q: Your heart is a single organ, but it acts as a double pump in the human body explain this important…
A: The human circulatory system consists of a muscular chambered heart, a network of closed branching…
Q: structure of offspring. B codes for regular structure while b codes for the lack of anterior…
A: This is a dihybrid cross because two characteristics are involved here. The dominant character is…
Q: 5. The following Figure for Question 5 shows a simplified Nitrogen Cycle driven entirely by…
A: Nitrogen FixationAmmonificationNitrificationDenitrificationDe-ammonification
Q: create a flow chart of how carbohydrate loading takes place in the lead up to a marathon race. The…
A: A class of…
Q: (b) In a batch bioreactor, the growth of a microbial population is often limited by the availability…
A: As the question contain two different questions, here we have only solved the second one. Bacteria…
Q: Part A Chemical reactions that release energy are called exergonic. energetic. endergonic.…
A: Living organisms shows metabolic properties. Different metabolic reactions occur within the living…
Q: You are planning a party for a group of friends. Which of the following foods can you serve to…
A: Celiac disease is an autoimmune disorder characterized by an intolerance to gluten. Gluten is a…
Q: One of the challenges of studying RNA is the rapid degeneration of RNA. While the half-life of mRNA…
A: A rod-shaped, Gram-negative, facultative anaerobic coliform bacteria of the genus Escherichia,…
Q: 2. Chemical X inserts channels into bacterial cell membranes. Rhodospirillium, a purple non-sulfur…
A: Photosystem I and Photosystem II are the two protein complexes present in cellular organelles of…
Q: Please provide a schematic representation
A: schematic representation of mode of action of interferon type 1.
Q: Procedure: 1. Count the number of cells across (from left to right) the field of view. 2. Count the…
A: The process of cellular life generally passes through a non-divisional growth phase followed by…
Q: The Min System Draw a FtsZ mutant cell, MinD mutant cell, and a MinE mutant cell.
A: In order to ensure precise cell division and proper spatial organization of the division site,…
Q: Will the lysozyme used to lyse cells cut B-galactosidase?
A: Enzymes function by attaching to particular molecules—referred to as substrates—and enabling the…
Q: Question 5 Use the following diagram to answer questions 4 and 5: Chose the appropriate letter. 14N…
A: Production of new DNA from the old DNA is known as DNA replication. In case of eukaryotic cells DNA…
Q: Define (in words and numbers) the following rates. Show numerators and denominators. It may not be…
A: The overall mortality rate for a population is known as the crude mortality rate.Crude death rate =…
Q: A population of bats exhibits logistic growth. The carrying capacity is 600 bats and the maximum per…
A: Logistic growth is a type of population growth pattern that occurs when a population initially grows…
Q: The purple sulfur bacteria using PSII produce reducing power (i.e. NADH) during light reactions of…
A: Purple photosynthetic bacteria, are typical anoxygenic photosynthetic bacteria. These bacteria use…
If gene transcription is inhibited after fertilization, development past the two-cell stage
does not take place in the mouse. However, in frog embryos, this treatment does not
disrupt development until late cleavage. Explain this difference.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- “In the early Drosophila embryo, the establishment of different body regionor tissues along, on the one hand, the anteroposterior axis and, on theother, the dorsoventral axis are initiated by clues provided by the egg’smother; however the nature of those signals and the way in which theyoperate is completely different”. Discuss whether this statement is correct.Explain why maternal effect genes exert their effects during theearly stages of developmentCleavage divides the eggs of vertebrates and many other animals into a cluster of separate cells. By contrast, theequivalent stage in the Drosophila embryo generates a syncytium. How does the presence of a syncytium affectthe early development of Drosophila?
- In flies developing from eggs laid by a nanos−mother, development of the abdomen is inhibited.Flies developing from eggs that have no maternallysupplied hunchback mRNA are normal. Flies developing from eggs laid by a nanos− mother that alsohave no maternally supplied hunchback mRNA arenormal. If too much Hunchback protein accumulatesin the posterior of the egg, abdominal developmentis prevented.a. What do these findings say about the function ofthe Nanos protein and of the hunchback maternallysupplied mRNA?b. What do these findings say about the efficiency ofbiological processes that are subject to evolution?A C. elegans (nematode) gene called par-1 helps todetermine the AP axis of the animal early in development. Scientists determined that par-1 is pleiotropic—it also has a later function in forming the vulva of theadult animal. How could researchers circumvent thelethality of par-1− mutants to observe the later function of the par-1 gene? (Hint: C. elegans larvae caneat bacteria expressing RNAi for any gene.)In flies, the gap gene kruppel is expressed in a broad band in the middle of the embryo with giant expressed as its anterior border and knirps at its posterior border. How is the expression of kruppel limited to this band in the embryo? Describe the spatial regulation of the kruppel gene.
- Explain hoxA3 and HoxD3 genes are nearly equivalent yet they play distinct roles in the development of mouse.Expression of a homeotic gene in the wrong tissue in Drosophila results in the development of an inappropriate body part from that tissue. Explain why this happens and how it shows that homeotic genes are positive regulators of developmental pathways.Lateral inhibition and induction are key processes in embryonic development. Discuss two different signalling pathways involved in these processes,
- Explain why axis-determination is a crucial aspect of embryonic development. Explain how maternal-effect genes encode cytoplasmic factors that play a role in axis determination.When an embryo is homozygous mutant for the gap gene Kr, the fourth and fifth stripes of the pair-rule gene ftz (counting from the anterior end) do not form normally. When the gap gene kni is mutant, the fifth and sixth ftz stripes do not form normally. Explain these results in regard to how segment number is established in the embryoThe three homeodomain proteins Abd-B, Abd-A, andUbx are encoded by genes within the Bithorax complexof Drosophila. In wild-type embryos, the Abd-B gene isexpressed in the posterior abdominal segments, Abd-Ain the middle abdominal segments, and Ubx in the anterior abdominal and posterior thoracic segments. Whenthe Abd-B gene is deleted, Abd-A is expressed in both themiddle and the posterior abdominal segments. WhenAbd-A is deleted, Ubx is expressed in the posterior thoraxand in the anterior and middle abdominal segments.When Ubx is deleted, the patterns of Abd-A and Abd-Bexpression are unchanged from wild type. When bothAbd-A and Abd-B are deleted, Ubx is expressed in all segments from the posterior thorax to the posterior end ofthe embryo. Explain these observations, taking into consideration the fact that the gap genes control the initialexpression patterns of the homeotic genes