b,ribosomes
c.Goigi apparatus
d,vesicles
B) the long arm of a chromosome
Answer:
The correct answer would be "Adaptive radiation happens over a relatively short time".
Adaptive radiation refers to the process of evolution in which ancestor organisms diversify rapidly into a wide variety or new forms as a result of environmental changes, availability of new resources, availability of new niches, or new challenges.
Accumulation of adaptive radiations over a long period of time results in speciation.
For example, Darwin's finches adapted according to their feeding behavior.
Answer:
B. on edge
Explanation:
B. Use a nucleic acid probe.
C. Subject the specimen to amniocentesis.
D. Use the polymerase chain reaction.
E. Subject the DNA to restriction enzymes.
Answer:
D. Use the polymerase chain reaction
Explanation:
Polymerase chain reaction (PCR) is a molecular technique used to make multiple copies or amplify a particular DNA sample. This enables scientist conduct thorough genetic analysis on minute sample of DNA, simply by amplifying it to a large quantity.
The PCR machine is usually used to amplify DNA fragment. The DNA fragments undergo three major steps successively: denaturation, annealing and elongation
The archaeologists would use the Polymerase Chain Reaction (PCR), a method for amplifying a specific fragment of DNA, to get sufficient DNA from the small scalp tissue sample for gene analysis. So the correct option is D.
To enhance the amount of DNA for a thorough analysis of the ancient human genes, the archaeologists would use the polymerase chain reaction (option D). The polymerase chain reaction, commonly known as PCR, is a method used to make numerous copies of a specified fragment of DNA. PCR is highly beneficial in research scenarios when only a small amount of DNA is available, as this technique can amplify a single or few copies of a specific DNA sequence to generate thousands to millions of copies. Techniques like electrophoresis, use of a nucleic acid probe, amniocentesis, or subjecting the DNA to restriction enzymes, are not primarily for amplification of DNA, but serve other purposes such as DNA separation, detection, prenatal testing, or DNA cutting at specific sequences, respectively.
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B. the United States.
C. twenty nations.
D. sixteen nations
D. sixteen nations
The International Space Station (ISS) is the biggest space station ever constructed, the largest structure ever congregated in space, and one of the most complicated global experimental projects in history.
The United States, with the help of NASA, commences the ISS project, by involving 15 other nations in construction and operating several parts of the station. The nations involved are Russia, Canada, Japan, Brazil, and 11 member countries of ESA (Belgium, The Netherlands, Norway, Spain, Sweden, Denmark, France, Germany, Italy, Switzerland, and the United Kingdom.
B. sensory neuron, spinal chord, motor neuron, to muscles
C. motor neuron, brain, sensory neuron, to muscles
D. sensory neuron, brain, motor neuron, to muscles
Answer:
the correct answer is A.) motor neuron, spinal cord, sensory neuron, muscles
Explanation: because its just the answer AND I OOOOOOOOP F RESH A VA CADOOOH