Answer:
C. It was necessary that each of the two phage components, DNA and protein, be identifiable upon recovery at the end of the experiment.Explanation:
Alfred Hershey and Martha Chase performed an experiment to identify the chemical nature of the genetic material.
After completion of the experiment, they found that DNA is a genetic material and not protein.
In this experiment, bacteriophage was used that is made up of DNA and protein so it was necessary to identify protein as well as DNA so both were labeled separately.
True membranes must fit these structural and functional qualifacations: consist of a superficial layer of epithelial tissue and a layer of connective tissue on which it rests; and anchor organs in place, serve as barriers, function in immunity and secrete various substances. A. True B. False
Answer:
True
Explanation:
True membranes must consist of a superficial layer of epithelial tissue and a layer of connective tissue on which it rests; and anchor organs in place, serve as barriers, function in immunity and secrete various substances
You discover a new sunflower that has blue flowers instead of yellow. When you cross this blue variety with a common yellow variety you get blue and yellow speckled flowers. What type of inheritance pattern does this gene exhibit?a. incomplete dominance. b. codominance.
c. simple Mendelian inheritance.
d. either incomplete dominance or codominance.
e. sex-influenced dominance.
Answer:
The correct answer is: B) codominance.
Explanation:
Codominance is a type of inheritance pattern that describes the relationship of two variations of the same gene: this means that in an individual, its two alleles manifest in the phenotype.
If a sunflower has both blue AND yellow speckles, it means that the two possible alleles are in a relationship, which makes these alleles CODOMINANT.
The rate at which your body consumes food energy to sustain basic functions is your: Group of answer choices Basal metabolic rate. resting metabolic rate. body mass index. set point.
Answer: Basal metabolic rate
Explanation: Basal metabolic rate is the rate at which the body consumes energy per unit time by endothermic animals at rest.
Basal metabolic rate is the amount of energy expended per unit of time to keep the body functioning even at rest.
The energy consumed by the body at rest to keep various involuntary body functions active is termed Basal metabolic rate. These involuntary body functions include breathing, heartbeat, etc.
_______consists of energy-releasing decomposition reactions. Such reactions break covalent bonds, produce smaller molecules from larger ones, and release energy that can be used for other physiological work. Energy releasing reactions are called exergonic reaction.
Answer:
The correct answer is: Catabolism.
Explanation:
The central nervous system is composed of the:________. a. brain and spinal cord. b. sympathetic and parasympathetic systems. c. autonomic and somatic systems. d. brain and somatic system.
Explanation:
The nervous system divides as, -(1) the peripheral nervous system and (2) the central nervous system . The central nervous system is the processing centre of the body. The central nervous system is consist of two parts ; (1) the brain and (2) spinal cord. The central nervous system is referred to as “central” because it received information from the body and then integrates the received information.
In the structural organization of many eukaryotic genes, individual exons may be related to which of the following? A) the various domains of the polypeptide product
B) the sequence of the intron that immediately precedes each exon
C) the number of polypeptides making up the functional protein
D) the number of start sites for transcription
In the structural organization of many eukaryotic genes, individual exons may be related to the following :
A) The various domains of the polypeptide product.
"Structural organization"In the structural organization of many eukaryotic genes, individual exons may be related to the following is the various domains of the polypeptide product.
The tertiary structure of the protein is made of different spaces. Each space of the protein has diverse work apportioned to them.
The exon is the utilitarian portion of the hereditary fabric.
The exon is portion of DNA which encodes for the portion of the develop RNA which is being delivered once all the introns have been evacuated after splicing.
Thus, the correct answer is A.
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Answer: Option A
Explanation:
The tertiary structure of the protein is made of multiple domains. Every domain of the protein has different function allotted to them.
The exon is the functional part of the genetic material. The exon is part of DNA which encodes for the part of the mature RNA which is being produced once all the introns have been removed after splicing.
It is the main part which decides the respective domain of the functional protein.
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
Answer:
Charged tRNA
Explanation:
The first time the expereiment was performed was on the 15th of May in 1961 by two men Marshall W. Nirenberg and his post doc, J. Heinrich Matthaei. This experiment is now called the Nirenberg and Matthaei experiment where they used ruptured E.coli cells, RNA and labelled tRNA to decipher the triplet codon that matched to specific amino acid. By the time the experiment was complete the men had found 64 amino acid codons which was a large contribution to genetics and molecular biology.
Which regions of the vascular bed is the actual site of gas exchange with surrounding tissue?
Explanation:
Explanation:
Many biofilm-specific phenotypes are controlled by "quorum sensing." This system allows bacteria to regulate gene expression according to the concentration of in its immediate environment.a) trueb) false
Answer:
True
Explanation:
this has been seen as an evolutionary step in bacteria activity. it also allows them to control the activity of the the whole community
Answer: A) True
Quorum sensing is the system that allows bacteria to regulate gene expression according to the concentration of in its immediate environment.
Explanation: Quorum sensing is the process by which bacteria cells communicate among/within themselves and share information about their density and as well adjust their gene expression accordingly.
In quorum sensing ,there is production, detection and response of bacteria cells to Autoinducers (extracellular signalling molecules).
Increase in bacterial population density brings about the accumulation of autoinducers in the environment,the bacteria cell now monitors the information of the autoinducers inorder to track changes in their cell number and collectively alter their gene expression.
Quorum sensing controls the disease causing ability of a bacterial cell.
Transcription in eukaryotes requires which molecules in addition to rna polymerase?
Answer:i d k
Explanation:
Answer:
several transcription factors
Two-component regulatory systems rely on a balance of phosphorylation and dephosphorylation of sensor kinases and response regulators. If the response regulator became permanently phosphorylated due to lack of phosphatase activity, which of the following would NOT happen? Hints O The cell would become more sensitive to the environmental stimulus The cell would become insensitive to the environmental stimulus. The cell would not be able to "reset" its response cycle. O The operon controlled by the response regulator would be always transcribed or never transcribed, depending upon the regulatory role of the response regulator.
Answer:
The correct answer is the first statement.
Explanation:
A fundamental stimulus-response coupling mechanism that helps various species to react and sense different modifications taking place in various distinct environmental circumstances is known as a two-component regulatory system. Though this system is found in almost all the domains of life, however, it is generally witnessed in species like bacteria, mainly in the Gram-negative and cyanobacteria.
In case, if the response regulator turns completely phosphorylated because of the absence of phosphatase activity, the cell would become insensitive towards the environmental stimulus. This generally happens as the cell will lose its tendency to sustain the response cycle because of the imbalance in the dephosphorylation and phosphorylation system that helps in sustaining the response of the cell towards a specific environmental stimulus.
Hair turns color when we age because the follicles at the base of the hair shaft cease to produce melanin. Melanin is a chemical that gives the hair shaft its color (black, brown, blond, red, and all shades in between). The darkness or lightness of your hair depends on how much melanin each strand contains. With age, the cells in the follicle that produce melanin die off. As they do so, that hair strand will become silver, grey, or white, as it grows. a. Argument; conclusion: The follicles ... cease to produce melanin.
b. Argument; conclusion: Hair turns color when we age.
c. Argument; conclusion: With age, the cells in the follicle ... die off.
d. Nonargument.
e. Argument; conclusion: The darkness or lightness ... each strand contains.
Answer:
Explanation:
D
The inner membranes of both mitochondria and chloroplasts are folded into various arrangements. What is the advantage of having a folded membrane rather than a simple interior membrane that follows the same oval shape as the exterior membrane?
The question is incomplete as itt does not have the options which are:
A) The folds in the membranes are a physical barrier for compounds that attempt to enter the organelle.
B) The folds allow for more surface area for the chemical reactions that occur across the inner membranes.
C) The folds allow these organelles to interact more efficiently with Golgi bodies.
D) The folds cause a necessary change in the organelles' internal pH.
Answer:
B) The folds allow for more surface area for the chemical reactions that occur across the inner membranes.
Explanation:
The mitochondria and chloroplast are double-membrane organelle that contains the outer and inner layer.
The outer layer is usually smooth of both the chloroplast and mitochondria but the inner membrane is not regular but folded.
The folding is an adaptive feature of these organelle to increase the surface area. The increased surface area allows the more ATPase in the inner membrane, therefore, increases the amount of ATP generated.
Thus, Option-B is correct.
Answer: Increased surface area.
Explanation:
The inner membrane of the chloroplast and mitochondria is folded because they provide maximum surface area for the processes takes place in the organelles.
The mitochondria helps in energy production by converting the glucose in adenosine triphosphate.
The chloroplast helps in providing maximum surface area for the process of photosynthesis.
The main advantage is the surface area which helps the organelle perform its function more efficiently.
What is the best way to promote fusion between two related populations of mosquitofish, one of which lives in a predator-rich pond and the other of which lives in a predator-poor pond?
Answer:
Build a canal linking the two ponds that permits free movement of mosquitofish, but not of predators.
Explanation:
On the Bahaman island of Andros mosquitofish populations live in various, now isolated, freshwater ponds that were once united. Currently some predator-rich ponds have mosquito fish that can swim in short, fast bursts, while other predator-poor ponds have mosquito fish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquito fish exhibit exclusive breeding preferences.
One device used for electrical safety involves a metal strip that bends when it gets hot. This bending flips a switch which interrupts the current. What is this device called?
Answer: An Electrical fuse
Explanation: An electrical fuse is a small, thin metallic conductor designed to melt and/or separate into two pieces for the purpose of breaking a circuit. electrical fuse interrupts circuit current in the event of electrical hazard. A circuit breaker is designed to automatically disconnect to an overcurrent condition.
Suppose two plant populations exchange pollen and seeds. In one population, individuals of genotype AA are most common (9,000 AA, 900 Aa, 100 aa), while the opposite is true in the other population (100 AA, 900 Aa, 9,000 aa). If neither allele has a selective advantage, what will happen over time to the allele and genotype frequencies of these populations?
Answer:
selection is not important at this locus; furthermore, the populations are no small, and hence the effects of genetic drift should not be pronounced, gene flow is occurring via the movement of pollen and seeds, thus, allele and genotype frequencies in these populations should become more similar over time, with regards to this locus, as a result of gene flow.
Explanation:
A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation time of the species is 1 hour, and there is no lag phase, how long will it be before the culture contains more than 10,000 cells/ml? a) 2 hours
b) 3 hours
c) 24 hours
d) 7 hours
Answer:
Option D
Explanation:
Given -
The lag phase is zero.
Generation time is the time required to double the population of bacteria.
This means that after every one hour the population of bacteria will get double.
Bacterial count at the starting when t is
Bacterial count at t is
Bacterial count at t is
Bacterial count at t is
Bacterial count at t is
Bacterial count at t is
Bacterial count at t is
Bacterial count at t is
Hence, after seven hours the culture will contains more than 10,000 cells/ml
Option D is correct
The earth's atmosphere:_______. a) is made mostly of oxygen helps recycle water b) protects the earth from harmful radiation c) reduces the temperature extremes between day and night recycles d) carbon dioxide and oxygen
Explanation:
Answer:
c
Explanation:
Salts and sugars work to preserve foods by creating A) lower osmotic pressure. B) hypotonic environment.
C) lower pH.
D) hypertonic environment.
E) depletion of nutrients.
Answer:
D) hypertonic environment
Explanation:
A hypertonic environment consists of a solution in which amount of solute outside the cell is more than the amount inside the cell. When the concentration of solutes is greater on the outside of a cell, water would move from inside the cell to outside of the cell, where the concentration is lower, hence causing shrinking of the cell.
Salt and sugar create a hypertonic environment in foods, thereby making the cells of food spoilage organisms to shrink and unable to thrive in the environment.
Is the flower the cantaloupe in the plant?
Answer:
The cantaloupe is not a flower but it is the fruit the plant bears