Answer:
D. Watson and Crick
Explanation:
Watson and Crick built on the findings from X-ray diffraction study of the DNA by Maurice Wilkins and Rosalind Franklin to analyse the structure of the DNA.
Findings from their analyses were published in 1953 and the two went on to receive Nobel price based on their findings later on.
The correct option is D.
You wake up and find yourself surrounded by ferns, trees, flying birds, and different types of dinosaurs. Which era did you wake up in? Proterozoic Paleozoic Mesozoic Cenozoic
How would an increase in carbon dioxide concentration in the atmosphere change the greenhouse effect?
Like all sciences, forensics using the scientific method to reach conclusions. However, in forensics, this method is followed a little differently. Why does the traditional format of the scientific method NOT work within the forensics field?
What type of inoculating instrument is used to transfer a bacterial culture to an agar deep?
What type of variables are factors that are being tested in an experiment?
What are the five types of materials used to make welding rods?
What part of the integumentary system blocks bacteria and fungi?
Final answer:
The skin, as part of the integumentary system, blocks bacteria and fungi by being a tough physical barrier and through the production of antimicrobial substances like lysozyme and toxic lipids. Dead skin cells are shed regularly, removing colonized microbes. Specialized immune cells beneath the skin surface also contribute to preventing infections.
Explanation:
Physical and Chemical Barriers of the Integumentary System
The part of the integumentary system that blocks bacteria and fungi is primarily the skin. This protective barrier functions through several mechanisms. The epidermis, being dry and acidic, creates an unfavorable environment for the growth of bacteria and fungi. Additionally, protective microorganisms on the skin compete with potential invaders, lessening the risk of infection. Other components such as hair follicles and sweat glands secrete substances like lysozyme and toxic lipids, which actively kill bacteria, while the shedding of dead skin cells regularly removes any microbes that may have colonized the surface. Beneath the epidermis, specialized cells like Langerhans' cells and intraepithelial lymphocytes actively recognize and start immune responses against common pathogens.
Mechanical barriers, a part of the body's first line of defense, play an essential role as well. The skin's outer layer is tough and resistant to penetration by pathogens. Innovations such as hairs in the nose trap larger particles, preventing them from reaching the respiratory system. Finally, other physical methods throughout the body, like the low pH of the stomach and urinary flushing, provide additional levels of defense against pathogenic microbes.
Movement of any particle or molecule from higher concentration to lower concentration is called _____
A. osmosis
B. pinocytosis
C. diffusion
D. phagocytosis
The substance that serves best to keep our skin smooth and protected is
________ is the substance that makes the plasma membrane more rigid and less permeable to water and water-soluble molecules.
A hypothesis is a lucky guess? True or false
Which condition is required for viruses to reproduce?
They must enter another virus structure.
They must enter the cell of another organism.
They must come in contact with water.
They must encounter a virus with genetic material different from their own.
Answer: They must enter the cell of another organism.
Explanation:
Viruses are intracellular parasitic organisms. It posses genetic material in the form of ribonucleic acid (RNA) which is enclosed inside a protein envelop. A virus being a parasite invade a host organism cell to produce it's own progeny viruses. A virus attach itself to the specific receptor site on the host cell membrane. The protein coat is left outside the cell and the viral genetic material is injected inside the host cell. Then replication of the viral genome takes place inside the host genome. The progeny viruses release from the host cell machinery by lysis of the host cell.
A new mother of a newborn girl calls the clinic in a panic, concerned about the blood-tinged soiled diaper. what is the best response from the nurse?
Answer: The nurse should explain that the blood on the diaper for a female infant may due to the withdrawal of maternal hormones after delivery. This is not very uncommon, the mother shouldn't be too concerned. However, the nurse should still recommend the mother to take the infant to a doctor.
A chart showing changes in electrical activity in the body is called a:
Final answer:
An ECG is a medical chart that depicts the electrical activity of the heart, showing crucial information on heart function and is essential for diagnosing heart conditions.
Explanation:
Understanding Electrocardiograms
A chart showing changes in electrical activity in the body is referred to as an electrocardiogram (ECG) or EKG. This medical tool records the voltages created by the heart during the depolarization and repolarization waves. When electrodes are placed on the body, they capture these voltages, which are then presented as a graph depicting the heart's electrical activity. A normal ECG tracing may include components, segments, and intervals that correlate to vital electrical events linked with heart contractions.
The standard ECG typically employs 12 leads which offer detailed information about the heart's function. The lead II potential, which measures the voltage between the right arm and the left leg, is commonly graphed and used as an indicator of heart function. This data is essential for diagnosing and understanding various heart conditions.
Another form of electrical activity monitoring is the electroencephalogram (EEG), which measures brain waves and is particularly useful in sleep disorder research. While the EEG provides a measure of brain's overall electrical activity, the ECG focuses on the heart’s electrical patterns.
Why do most enzymes stop functioning after being soaked in a strong acid or base?
A) They have been diluted.
B) Their water content has been reduced.
C) They have been converted to tripeptides.
D) Their bonding structure has been changed.
Answer:
a
Explanation:
The nurse is assessing a 6-month-old child. the mother asks when the soft area in her child’s head will go away. what is the best response by the nurse
Which two statements are true for the leading strand in DNA?
It is synthesized toward the replication fork.
It is synthesized in the 3′ to 5′ direction.
It is synthesized away from the replication fork.
It is synthesized in the 5′ to 3′ direction.
Answer: The correct options are statement first and fourth that is -
It is synthesized toward the replication fork and it is synthesized in the 5′ to 3′ direction.
Leading strand in DNA is the strand of new DNA being synthesized in the same direction where the replication fork is moving. The movement of replication fork allows the access of template for the new DNA.
The DNA synthesis is continuous in the leading strand. It is synthesized in the 5' to 3' as DNA synthesis always takes place in this direction. This is because dNTP ( deoxyribonucleoside triphosphate) provides free 3' OH group where new dNTP can be added by the enzyme DNA polymerase.
The correct answer is option A and D, It is synthesized toward the replication fork and It is synthesized toward the replication fork.
Reason -
A leading stand of DNA is synthesized in the direction same as that of the replication fork movement. Since the replication moves in the 5’-3’direction, the leading strand of DNA is also synthesized in the 5’-3’direction. This strand is a continuous strand and it has no breaks in it. The nucleotides are continuously added to the 3’ end of the strand.
20 POINTS!!!!!!!!! PLZ HELP ME!!!!! Sorry for yelling
Answer:
Plant C will grow the highest because it is located under the Red light, which "gives them the most energy to power photosynthesis".
Plant A should grow to 2nd place, because it is located under the Yellow light, in which Yellow light is more closely related to red then green
Last but not least, Plant B will grow to 3rd highest, because it is under a green light
Explanation:
What are the working conditions? inside/outside? office/plant/lab? forensic engineer?
Final answer:
Forensic engineers typically work inside secure labs, like the DNA extraction room at U.S. Army Criminal Investigation Laboratory, doing technical analysis. They must be comfortable with routine work and might work alone or collaborate with teams. The environment usually requires secure entry and specialized tools for detailed evidence analysis.
Explanation:
Working Conditions for a Forensic Engineer
Forensic engineers play a critical role in criminal investigations, especially when it comes to analyzing physical evidence. They often work inside secured laboratories, such as a DNA extraction room at the U.S. Army Criminal Investigation Laboratory. The work differs depending on the specialty, but many forensic engineers spend a significant portion of their day in a lab setting, performing technical analysis and conducting experiments.
The job entails a combination of technical skills and meticulous methods. Forensic engineers must be comfortable with routine work, as they may perform the same type of analysis multiple times to ensure accuracy. They usually work with various tools and equipment specific to their field of expertise.
Workplaces are often not open to the public due to the sensitive nature of criminal investigations and thus require secure entry. In terms of social interactions, while some engineers may work alone, others may be part of teams, collaborating with law enforcement and legal professionals. An assessment of one's preferences for social interaction, routine, and workspace environment is crucial before deciding to pursue a career in forensic engineering.
If a dividing cell has centrioles what does this tell you about the cell
Final answer:
Centrioles in a dividing cell suggest it is an animal cell, as they assist in organizing spindle fibers for chromosome separation during cell division. However, their exact function is not fully understood, evidenced by the ability of cells without centrioles, including plant cells, to divide successfully.
Explanation:
If a dividing cell has centrioles, this implies that the cell is likely an animal cell as centrioles are primarily found in animal cells and some lower plant forms. These cylindrical structures play an important role in cell division by organizing the microtubules that position the chromosomes correctly during the process.
During cell division, the centrosome, which includes a pair of centrioles, replicates itself. The centrioles assist in pulling the duplicated chromosomes to the opposite ends of the dividing cell. It's interesting to note, however, that while centrioles are associated with the organization of the spindle fibers that distribute chromosomes during cell division, their exact role is not fully understood. This confusion arises because cells without centrioles can still divide, and plant cells, which typically lack centrioles, are also capable of cell division.
At what age do males undergo puberty nutrition
Where do living things find the nutrients that they need to survive
Besides oxygen, what other bloodborne material must be provided to the affected tissues in adequate quantities to promote normal wound healing?
Besides oxygen, wound healing requires nutrients and growth factors to be provided in adequate quantities to the affected tissues.
Explanation:Besides oxygen, another bloodborne material that must be provided to the affected tissues in adequate quantities to promote normal wound healing is nutrients. These include macronutrients like carbohydrates, proteins, and fats, as well as micronutrients like vitamins and minerals.
Macronutrients provide energy and building blocks for tissue repair, while micronutrients play essential roles in various biochemical processes.
Furthermore, growth factors are also crucial for wound healing. These signaling molecules stimulate cell proliferation, migration, and differentiation, promoting tissue regeneration.
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In addition to oxygen, adequate glucose is crucial for normal wound healing, providing energy for cell functions during tissue repair.
Apart from oxygen, the supply of adequate nutrients, especially glucose, is crucial for promoting normal wound healing. Glucose serves as the primary energy source for cells involved in the wound healing process. During the various stages of tissue repair, cells require energy to carry out functions like cell proliferation, collagen synthesis, and tissue remodeling.
Glucose is metabolized to produce adenosine triphosphate (ATP), which fuels cellular activities. A deficiency in glucose can hinder these processes and impede the efficient repair and regeneration of damaged tissues. Therefore, maintaining a proper balance of oxygen and nutrients is essential to provide the energy and resources necessary for the cells at the wound site to perform their functions and facilitate successful wound healing.
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An injury could stimulate _____, which are specialized sensory receptors for pain
An accident or injury, may and can stimulate the nociceptor/s, which is (a)/are specialized sensory receptors for pain. Nociceptors are a kind of receptor located on the tip of a sensory neuron's axon, which reacts to harmful or possible harmful stimuli by means of sending hazard indications to the spinal cord and to the brain.
as resources become scarce because of population growth the growth
A. is unpredictable
B. levels off
C. increases slowly
D. is exponential
Answer:
it levels off
Explanation:
Michael was born with cataracts in both eyes. what can you tell his parents about the possibility of recovery as it relates to sensitive periods in brain development? michael should not have corrective surgery until adulthood, as earlier surgery may permanently damage his eyes. corrective surgery should be postponed until early childhood so that michael can fully recover his visual skills. the longer cataract surgery is postponed beyond infancy, the less complete the recovery in visual skills. there is only a slight chance that corrective surgery can repair michael’s severe impairment.
Research has shown that delaying cataract surgery can lead to less complete recovery in visual skills. It is recommended to postpone corrective surgery until early childhood to allow for full recovery.
Explanation:Research has shown that there is a critical period of development for vision, where sensory input from the eyes is crucial for the development of neural connections. Delaying cataract surgery beyond infancy can lead to less complete recovery in visual skills. It is recommended to postpone corrective surgery until early childhood to allow Michael to fully recover his visual skills.
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Peter was surprised to learn that, in addition to blood, there's another type of circulating body fluid that flows within separate vessels. what is the name of this circulating fluid that doesn't contain red blood cells?
The circulating body fluid that doesn't contain red blood cells and flows within separate vessels from blood is known as lymph. The lymph and the lymphatic system play a critical role in the immune system and maintain body fluid balance.
Explanation:Peter was surprised to learn that in addition to blood, there is another type of circulating body fluid that flows within separate vessels, and this fluid does not contain red blood cells. This fluid is known as lymph, and it circulates through the lymphatic system.
The lymphatic system is a crucial part of the immune system, patrolling the body for foreign invaders and supporting the body's fluid balance. Unlike blood, which is pumped by the heart through a closed circulatory system, lymph is moved primarily through muscle movement.
Blood itself is composed of different elements, such as red blood cells (erythrocytes), white blood cells (leukocytes), and platelets, all suspended in a fluid called plasma. The plasma also contains dissolved substances and various proteins including antibodies which are vital for immune responses.
ATP is converted into ADP when energy is needed by an organism. If water were not available in the mitochondria, what would most likely happen?
Light waves are transduced by ________ in order to see, whereas sound waves are transduced by ________ in order to hear.
Light waves are transduced by photoreceptors to enable vision, while sound waves are transduced by hair cells in the cochlea to facilitate hearing. Both processes convert physical energy into neural signals that are interpreted by the brain.
Light waves are transduced by photoreceptors in order to see, whereas sound waves are transduced by hair cells in the cochlea in order to hear. The process of transduction converts the physical energy of light and sound waves into neural signals that our brains can interpret. In the eye, light passes through the cornea and lens, allowing images to be focused on the retina, which contains rods and cones. These photoreceptors then convert light into electrical signals. In the ear, sound waves enter the auditory canal, making the eardrum vibrate. These vibrations pass through the ossicles to the cochlea where hair cells detect the mechanical movements and convert them into electrical signals sent to the brain via the auditory nerve.
Describe how some cells came to have chloroplasts, according to the theory of endosymbiosis.