What did Hershey and Chase
discover?
A. bacteriophages using DNA to infect bacteria
B. the shape of DNA
C. bacteria transforming a material, bringing them
back to life when one was killed
D. which bases pair together in DNA

The appropriate choice must be (A).

Science contributes greatly to the generation of knowledge and hence contributes to the operation of democracies, fosters innovation and allows countries to be competitive in the global economy.

The ongoing work of men and women from various nations throughout history has contributed to the existing body of scientific knowledge.

It is not simply wealthy men with money who could conduct experiments and get a scientific conclusion. We are all familiar with Marie Curie, who is renowned for her work in radioactivity and twice earned the Noble Prize.

Of course, advances in science have been accomplished before to the 20th century; for instance, Newton discovered gravity in the 17th century.

Therefore, the existing body of scientific knowledge is not constrained by specific limitations; rather, it is the result of ongoing efforts made by men and women from various nations throughout history.

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Acetylcholine broken down is the process by which this neurotransmitter activates a suitable ligand-receptor to trigger a cell signaling pathway.

Acetylcholine is a chemical messenger (i.e., a neurotransmitter) that is used to transmit signals inside the body.

Acetylcholine broken down is due to its hydrolysis, which ends cell signaling between brain synapses.

In conclusion, Acetylcholine broken down is the process by which this neurotransmitter activates a suitable ligand-receptor to trigger a cell signaling pathway.

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The correct answer is Eukarya has similar evolutionary traits to Archaea.

Thus, option "D" is correct.

The six kingdom classification by Carl Woese divided the organisms into three domains which are Bacteria, Archaea, and Eukarya. the archaea and Eubacteria are micro-organisms while plants, animals, and microorganisms such as fungi and protists under Eukarya.

The Eukaryotes are more closely related to the Archaea than bacteria as:

1. Transcription - they both use same TATA-binding proteins-TFIIB and elongation factors.

2. Translation- First amino acid during protein synthesis is the same in both the organisms which is methionine.

3.  Histones - same histones are involved in the packaging of DNA.  

4. Sensitivity to antibiotics- both are insensitive to antibiotics.

Thus, Eukarya has similar evolutionary traits to Archaea is the correct answer, option "D" is correct.

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The invertebrate chordates include Tunicates and lancelets.

They are a group of chordates that possess notochords somewhere in their life span but end up not possessing the vertebral column. They possess all the characteristics of chordates.

Invertebrate chordates include the Urochordata which are the Tunicates and the Cephalochordata which are the lancelets.

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The structures of the neuromuscular junction are apresynaptic region; synaptic cleft and postsynaptic region.

The neuromuscular junction is where a nerve ending joins skeletal muscle tissue. Muscle contraction signals are initiated by chemicals, such as the neurotransmitter acetylcholine, that are transferred from the nerve ending, or motor end plate, to the muscle.

The importance of neuromuscular junctions is the synapse region between skeletal striated muscle fiber and motor axon; whose function is the transmission of the nerve impulse.

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The probability that a female child of Charles and Marie would suffer from hemophilia is 0 percent.

X-linked diseases are diseases whichabre found only on the X chromosomes.

Hemophilia is an X-linked recessive disorder (Xh)

Charles is has the normal X chromosome YXH

Marie is a carrier of the disease XHXh

A cross between YXH and XHXh will not produce any XhXh.

Therefore, the probability that a female child of Charles and Marie would suffer from hemophilia is 0 percent.

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Answer:

Fight or flight

The amygdala activates this fight-or-flight response without any initiative from you. When that part of your brain senses danger, it signals your brain to pump stress hormones, preparing your body to either fight for survival or to flee to safety.

1. Monongahela River

2. Fort William Henry

3. British gain control of the St. Lawrence River

4. Battle of Quebec

All battles given were between the French and British. However, the two battles that happened prior to 1756 were the Battle of Monongahela River and the Battle of Lake George. The first battle happened on July 9, 1755. It was won by the French and Indian troops against the British and Americans. The second battle happened on September 8, 1755. It was won by the British, and is considered their first major victory against the French troops.

Thus, this could be the answer.

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The process by which photoreceptors become activated when the photopigments within the discs of the cells are altered by light entering the eye is phototransduction.

The photoreceptor responds to light stimulation by changing its resting membrane potential, resulting in a change in the neurotransmitters that it releases.

It should be noted that receptors bind to ligands and causes response in the immune system.

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Because one of the two strands of a replicated DNA molecule is newly synthesized and the other is the original template, DNA replication is said to be a semi-conservative process.

DNA replication may be defined as the biological process that involves duplicating a DNA molecule comparable to the construction of two DNA molecules.

DNA replication is proceeded by the semiconservative model, which means that the parental double helix is half conserved, and each parental single strand remains intact.

Therefore, it is well described above.

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Answer:

I think the answer is K.

Explanation:

R Species produce more offspring. Whereas K species produce fewer species due to carrying capacity.

I hope this helps! Correct me if I am wrong.

Answer: C. Beaker C

Explanation:

Because there is more of salt, the solute in the the solvent, water.

By Newton's second law

F=ma , F=force (unit= N)

m=mass (Kg), a=acceleration (m/s2)

By applying the formula, we can calculate acceleration

a = F/ m

For object A,

Force =15N, Mass=25kg

a= 15/25

acceleration, a=0.6m/s2

For object B,

Force=15N, Mass=50 kg

a=15/50

acceleration,a=0.3m/s2

By calculation, the acceleration of object A is twice the of object B.

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Answer:

See image

Explanation:

Plato

Answer:

D they have membrane bound organelles

Explanation:

Question: What day is considered to be the first day of a female's reproductive cycle?

Answer: When hormone levels are low and the uterus lining is shed.

The first day of a female's reproductive cycle is when hormone levels are low and the ovary releases an egg. This is known as ovulation and is the most important part of a woman's menstrual cycle.

During ovulation, the egg's follicle bursts open and is released, travelling down the fallopian tube towards the uterus.

If the egg is fertilised, it will implant in the uterus and a pregnancy will begin; if it is not, it will be reabsorbed by the body, and the cycle will restart.

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Eukaryotic is the characteristic most likely describes a mushroom but not Thermus aquaticus because it is a is prokaryotic organism.

Eukaryotic organisms are life forms that are characterized to have cell nuclei and membrane-bound organelles.

Eukaryotic organisms can be either unicellular or multicellular (e.g. plants and animals).

In conclusion, Eukaryotic is the characteristic most likely describes a mushroom but not the bacterium Thermus aquaticus.

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Explanation:

The most primitive surviving vertebrate are those in the Agnatha class.

This refers to a group of fishes that are jawless. They include lampreys and hagfishes.

Fishes in the Agnathan class have no fins nor stomachs.

Hagfishes still exist with over 76 species in different cold waters around the world.

Lampreys live mostly as parasites on other fishes and are found in the Atlantic oceans.

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Answer:

3' -TACCGGCCAATAATTCGT- 5'

Explanation:

A with T, G with C

Reliability is another name for the precision of the measurement, and it means how well the value is repeated; this is, how close the different measurements are to each other. If the measurements are close one to each other, then the instrument is precise or reliable (high reliability).

Validity is another name for the accuracy of the measurement; this is, how close the measurement is to the true or accepted value.

With that, we can compare the reliability (precision) and validity (accuracy) of the four different thermometers.

Repeat the table:

Temperatures in °C:

Thermometer  Reading 1   Reading 2   Reading 3

       W                 100.1             99.9             96.9

        X                 100.4           102.3             101.4

        Y                  90.0            95.2             98.6

        Z                  90.8             90.6            90.7

Reliability:

To analyze reliability (precision) we must compare the measures of every thermometer among them. A good approximation can be made calculating the range, i.e. the difference between the largest and the smallest readings:

Now, you conclude that the most reliable is thermometer Z and the least reliable is thermometer Y. The complete ranking, from most reliable to least reliable is:

Z > X > W > Y

Validity:

To determine validity you must compare the mean of the three measures for each thermometer with the accepted value for the boiling point of pure water (100.0°C).

The mean is the sum of the three readings divided by 3.

The absolute error is calculated with the formula:

absolute error = | accepted value - calculated value |.

The calculated value is the mean.

For W: mean = (100.1 + 99.9 + 96.9)°C / 3 = 99.0°C

                   absolute error = 100.0°C - 99.0°C = 1.0°C

For X: mean = (100.4 + 102.3 + 101.4)°C / 3 = 101.4 °C

                  absolute error = 101.4°C - 100.0°C = 1.4° For Y: mean = (90.0 + 95.2 + 98.6)°C / 3 = 94.6°C

                  absolute error = 100.0°C - 94.6°C = 5.4°C

For Z: mean = (90.8 + 90.6 + 90.7)°C / 3 = 90.7°C

                  absolute error = 100.0°C - 90.7°C = 9.3°C

Now you can rank the thermometers as per their validity (accuracy):

1.0°C < 1.4°C < 5.4°C < 9.3°C

Thus, W is the most accurate, X is the second most accurate, Y is the third, and Z is the least accurate.

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The receptor cells for vision are located in the retina of the eyes and are called rods and cones.

Receptor cells are proteins found either inside a cell or on its surface which receive a signal.

The two primary photoreceptor cells are rods and cones and they  contribute to the information used by the visual system to form a representation of the sight.

They are found in the retina of the eye.

Therefore, the receptor cells for vision are located in the retina of the eyes and are called rods and cones.

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Explanation:

According to the chemiosmotic hypothesis, ATP is produced by due to the proton gradient created across the mitochondrial membrane. The essential components required for chemiosmosis are proton pump, proton gradient and ATP synthase. ATP synthase is an enzyme which helps in ATP synthesis. The enzyme ATP synthase has two part

F0 andF1.F0 is the part which transports protons across the membrane as a transmembrane channel while configuration changes in F1

activates the enzyme. They phosphorylate ADP i.e., add one more phosphorus group to the ADP and converts ADP(adenosine diphosphate) to ATP (adenosine triphosphate). The proton gradient developed across the membrane is the driving force of ATP synthase.

Membrane proteins that bind to signal by which cells communicate are called receptors are generally transmembrane protein.

When the protein presents an internal signal sequence (SSI), this sequence, in addition to directing the transport of the translational complex to the REG, will also act as an SPT, with the carboxy-terminal portion of the protein facing the lumen. from the reticulum or into the cytosol.

in this case, many transmembrane proteins function as gateways to permit the transport of specific substances across the membrane.

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Answer:

-1

Explanation:

(y ly=-7, -6, -2, -1, 0, 1, 3, 9}

1

900 MHz devices are more expensive and provide slower data output.

WLAN is defined as a wireless distribution of network used for two or more devices.

The industrial, scientific, and medical (ism) band is a WLAN that makes use of radio frequency

for domestic network purposes.

A gigahertz connection delivers more bits per second more than a megahertz connection.

Therefore, 900 MHz cannot be compared with 2.4 gigahertz (ghz) and 5 ghz frequency systems because 900 MHz devices are more expensive and provide slower data output.

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