Answer: D - pili
bacteria communicate and exchange genetic information through extensions of their cell walls called 'pili'.
Explanation:
Pili are found in bacteria and archaea surfaces as thin, rigid, hair-like fiber made of protein. They aid attachment of various bacteria cells to surfaces and other cells.
Pili are antigenic. They act as binding site for other cells like viruses and bacteria cells.
When pilus of a bacterium binds another bacterium cell (recipient cell), the single strand DNA is transferred to the recipient cell. Among the types of pili, the conjugative pili are known for communication and exchange of genetic informations between bacteria cells. The conjugative pili are also known as 'sex pili'. Exchange of DNA occurs after attachment of the donor to the recipient. The donors (bacteria cells with conjugative pili) attach to the recipients (bacteria without conjugative pili), connecting cytoplasm of both cells and promoting exchange of genetic materials including transfer of pili to the recipient cell.
Which structural feature of the cell membrane allows molecules such as oxygen and carbon dioxide to diffuse into and out of the cell? *
The cell membrane contains proteins molecules.
The cell membrane contains cholesterol molecules.
The cell membrane is made up of two layers of phospholipids.
The cell membrane is anchored to the cytoplasm by the cytoskeleton.
The two layers of phospholipids in the cell membrane allow molecules like oxygen and carbon dioxide to diffuse into and out of the cell.
Explanation:The correct structural feature of the cell membrane that allows molecules such as oxygen and carbon dioxide to diffuse into and out of the cell is the two layers of phospholipids. The cell membrane is composed of a phospholipid bilayer which has a hydrophobic interior and hydrophilic exterior. This arrangement allows small, nonpolar molecules like oxygen and carbon dioxide to easily pass through the membrane by simple diffusion.
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Foods made with solid fats and/or added sugar are considered to contain empty calories because
During _______________ the homologous chromosome pairs separate in a random fashion leading to genetic diversity among the offspring.
A lizard lives in a desert. which would be an adaptation for this lizard?
The adaptations in a lizard living in a desert include camouflage, heat tolerance, nocturnal behavior, burrowing, and specialized diet.
What are the adaptations?A lizard living in a desert would likely have several adaptations to help it survive in the harsh environment. Some of these adaptations may include:
1. Camouflage: The lizard may have a color pattern that matches its surroundings, allowing it to blend in and avoid predators.
2. Heat tolerance: The lizard might have physiological adaptations that help it withstand high temperatures, such as a higher tolerance for dehydration or a more efficient cooling mechanism.
3. Nocturnal behavior: To avoid the extreme heat of the day, the lizard might be active primarily at night when temperatures are cooler.
4. Burrowing: The lizard may have adaptations for digging, allowing it to create burrows to escape the heat and provide shelter.
5. Specialized diet: The lizard might have a diet that is specifically suited to its environment, such as eating insects or plants that are more common in the desert.
These are just a few examples of adaptations that a desert lizard might possess to help it survive and thrive in its arid environment.
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Why is heat death the most likely option?
In the some areas of Africa, droughts have caused clean drinking water sources to dry up. How would technology most likely be useful for this region?
Technology can assist drought-stricken areas of Africa by providing desalination plants, rainwater harvesting systems, solar-powered water pumps, and environmentally sustainable water transport and purification methods.
In regions of Africa where droughts have caused clean drinking water sources to dry up, technology could play a significant role in mitigating the crisis. Advanced technologies suitable for these regions include desalination plants to convert saltwater into freshwater, rainwater harvesting systems to collect and store rainwater for use during dry periods, and solar-powered water pumps to access deep groundwater sources. Additionally, creating infrastructure for water transportation from water-rich to water-scarce areas can help address the water shortages.
Moreover, green science and technology can provide water without harming the environment. Examples include the diversion of river water with subsequent purification in constructed wetlands and using renewable energy to pump water to arid regions. These solutions not only supply water but may also enhance water quality and contribute to environmental sustainability.
What are three organelles that are only found in plant cells and not in animal cells?
Select all that apply. A balance must exist between substances entering and exiting cells. Most animals remove substances by _____. eating sweating breathing urinating
Most animals remove substances by sweating, breathing and urinating.
Excretion is the expulsion to the outside of harmful or useless products that are in the blood and intercellular plasma.
Waste from the body is eliminated through the respiratory and excretory systems.
The excretory system is a set of organs and other structures that are responsible for eliminating urine and sweat, which are liquids that have diluted non-usable substances by the body.The sweat glands produce sweat from the water that has filtered out of the blood capillaries.Some non-usable substances are secreted from the blood capillaries into the nephron, obtaining urine.Breathing with its permanent action of inhaling and exhaling air introduces oxygen to the body and discharges carbon dioxide.Therefore, we can conclude that waste from the body is eliminated through the respiratory and excretory systems, where most animals remove substances by sweating, breathing and urinating.
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Why are enzymes important to cells? they help bring about chemical reactions. they store large quantities of energy. they provide structural support. they form the two layers of membranes. description?
they help bring about chemical reactions
True or false: strength training improves bone density decreasing the risk for osteoporosis.
Which arrangement is represented in the periodic table?
A.
a repeating pattern of outer electrons
B.
random order for atomic mass
C.
a reverse sequence for the number of neutrons
D.
repeating patterns of isotopes
Answer: Option (A) is the correct answer.
Explanation:
Elements that belong to the same group show similar chemical properties.
This is because elements that lie in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.
For example, all alkali metals are very reactive in nature as all of them contain 1 valence electron.
Therefore, in a group pattern of outer electrons is repeating.
Thus, we can conclude that a repeating pattern of outer electrons is the arrangement which is represented in the periodic table.
Months after tonya's left index finger was severed in a factory accident, she noticed an increase in the sensitivity of the fingers near the missing one. the increased sensitivity is caused by:
This is caused by somatosensory cortex area that used to receive input for the index
finger which severed and as a result that area is now receiving input from
the other nearby fingers casing the sensitivity to increase.
Neurons are the carriers of the feelings, pain, sensitivity etc to somatosensory cortex and the served finger part's sensory feelings are being
received by nearby fingers.
1. Fresh lava traps the direction of the earth's magnetic pole as it hardens.
2. The youngest rock is formed at the center of a mid-ocean Ridge.
3. Stripes of the magnetic rocks are visible on the ocean floor.
True or False?
Final answer:
The statements about mid-ocean ridges, the age of rocks, and the stripes of magnetic rocks on the ocean floor are all true, relating to concepts of plate tectonics and magnetic field reversals important for understanding Earth's geologic history.
Explanation:
The statements provided all relate to the geological phenomena that occur at mid-ocean ridges, such as the Mid-Atlantic Ridge and involve the concepts of plate tectonics and magnetic field reversal. Here are the answers to the true or false questions:
Fresh lava traps the direction of the earth's magnetic pole as it hardens. - True. As lava cools and solidifies at mid-ocean ridges, the iron minerals within can align with Earth's current magnetic field, effectively recording the direction of the magnetic poles at that time.The youngest rock is formed at the center of a mid-ocean Ridge. - True. New oceanic crust is generated at the center of mid-ocean ridges due to the upwelling of magma as tectonic plates diverge from each other.Stripes of magnetic rocks are visible on the ocean floor. - True. Stripes of magnetized rock on either side of a mid-ocean ridge illustrate symmetrical patterns of magnetic reversals, indicating the historic changes in Earth's magnetic field as new rock is formed and spread outward from the ridge.Understanding these processes is essential in studying Earth's geologic past and present. For instance, by measuring the rate of seafloor spreading at mid-ocean ridges, geologists can estimate the rate of plate movement and use this information to reconstruct the geologic history of the Earth's magnetic field reversals and plate tectonics.
A condition in which the sides of the chest move opposite each other during breathing is called:
Which body functions increase during the fight-or-flight reaction?
The krebs cycle provides a common pathway for the metabolism of nutrients by the body. the krebs cycle forms two pyruvate molecules. each of the two pyruvate molecules formed in the cytoplasm from one molecule of glucose yields another molecule of what
explain how humans can influence biodiversity by changing the environment.
Classify the sides of the mountain based on the direction of the prevailing winds.
Answer:
Leeward on the left Windward on the right that all you had to say partner
Explanation:
Have A Good Day ;)
What Are 5 Characteristics that describe science.
1
2
3
4
5
1. Testable
2. Reproducible
3. Explanatory and
4. Predictive, but always
5. Tentative.
Science is characterized by its focus on the physical and natural world, reliance on testable and refutable explanations, empirical evidence, involvement of the scientific community, and the acknowledgment of its imperfections.
Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Below are five characteristics that help describe what science is:
Studies the Physical and Natural World: Science is primarily concerned with understanding the physical and natural world through observation and experimentation.Testable and Refutable Explanations: Scientific knowledge is developed through hypotheses and theories that can be tested and potentially refuted through evidence.Empirical Evidence: Science relies on empirical, or observable, evidence to support its conclusions. This evidence must be reproducible and consistent.Involves the Scientific Community: Science is a collaborative effort involving peer review and shared knowledge among scientists to validate findings and promote advances.Imperfections Acknowledged: Science is an evolving field, and it acknowledges its own limitations and the potential for error, which drives ongoing questioning and refinement of knowledge.Why are structures within plant and animal cells called organelles?
For the same reason that human organs function to maintain a person's health and vitality, cells' "organs" do the same to maintain the homeostasis of the cell.
What are cell organelles?An organelle is a specialized component with a particular function that is often found within a cell in cell biology.
The word organelle refers to the concept that these structures are components of cells, much like organs are to the body.
They perform vital tasks that are required for cells to survive, including gathering energy, producing new proteins, getting rid of waste, and other activities.
Therefore, the nucleus, mitochondria, endoplasmic reticulum, and numerous other organelles are examples of core organelles.
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Structures within plant and animal cells are called organelles because they are specialized structures that have specific functions, just like organs in the body.
What are organelles?Organelles are specialized structures within a cell that have specific functions. They are like the organs of the human body, but much smaller. Organelles are enclosed by membranes, which separate them from the rest of the cell and allow them to maintain their own internal environment.
Organelles work together to keep the cell alive and functioning properly. They are essential for all of the activities necessary for life, such as growth, metabolism, and reproduction.
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What is paleoanthropology?
a. it is practiced by archaeologists only.
b. it is defined as the study of early humans.
c. it is practiced by physical anthropologists only.
d. it is concerned with fossilized skeletal remains only.
e. it is defined as the study of fossilized non-primate mammals?
"what is the most difficult step in reconciling a checking account"
The most difficult step in reconciling a checking account is keeping in track with the check register as the check register has list and steps that he or she needs to carry out when you are about to reconcile with your checking account.
Number datatype would be appropriate for a zip code.
a. True
b. False
The formation of a protective superficial layer of skin cells filled with keratin is called
The answer is keratinization. This is sometimes called as cornification action. It is the development of dead, protective, and superficial layers of cells occupied with keratin. Happens on all bare skin surfaces. Cells transfer from stratum basale to stratum or in other words deep to superficial in a period of 15-30 days.
What limited protection do cells have against the damaging effects of uv radiation?
Cells are partially defended against UV radiation by the ozone layer, which filters most high-energy UV rays, and by melanin in the skin, which helps block UV-B rays. Some organisms have enzymes like photolyase to repair UV-induced DNA damage, while plants have protective pigments and epidermal layers.
Cells have limited protection against UV radiation through various biological mechanisms. The ozone layer acts as a barrier, absorbing high-energy UV radiation like UV-C, thus reducing potential damage to cellular DNA. For lower-energy UV-B that reaches the Earth's surface, cells have developed some defense strategies. One such mechanism is the formation of melanin in the skin, which provides a protective dark pigment to shield against further UV damage, a process which we observe as suntanning.
The arbitrary and capricious test is very well defined.
a. true
b. false
We do this quickly because our psychological immune systems have
Describe how chromosomes and centrioles are related to one another
Give two reasons why understanding sea depth or bathymetry is important when tracking marine animals
The two reasons why understanding sea depth or bathymetry is important when tracking marine animals: a) Different marine animals live at different depths. b) Bathymetry can help scientists track the movements of marine animals.
a) Different marine animals live at different depths. The water depth affects the temperature, salinity, pressure, and availability of food, all of which can impact the distribution and behavior of marine animals.
For example, some fish species, such as tuna, prefer to live in the open ocean where the water is deep and cold. Other fish species, such as sharks, prefer to live in shallower waters where there is more food and light. By understanding the bathymetry of an area, scientists can better predict where to find different marine animals.
b) Bathymetry can help scientists track the movements of marine animals. Marine animals often migrate between different depths in the ocean, depending on the time of year or their life cycle.
For example, some whales migrate to shallower waters to breed and give birth, while others migrate to deeper waters to feed. By understanding the bathymetry of an area, scientists can track the movements of marine animals and learn more about their behavior.
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The two reasons why understanding sea depth or bathymetry is important when tracking marine animals are bathymetric data and accurate bathymetry.
Understanding sea depth, or bathymetry, plays a pivotal role in effectively tracking marine animals for multiple reasons.
The first reason is that the bathymetric data provides essential information about the underwater landscape, aiding in the identification of key oceanic features like canyons, seamounts, and ridges. This knowledge is crucial for comprehending marine animal behavior and migration patterns. It helps scientists pinpoint critical habitats, feeding zones, and breeding grounds, enhancing conservation strategies.
The second reason is that accurate bathymetry is critical for determining how depth variations affect animal movements and behavior. Dive patterns may be influenced by shallow places, whilst thermoregulation tactics may be influenced by deeper regions. Furthermore, understanding bathymetry helps to keep marine species safe by preventing them from stranding in shallow waters. Overall, including bathymetric data into tracking efforts increases our understanding of complex marine ecosystems and the deep linkages that shape them.
The two reasons are bathymetric data and accurate bathymetry.
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In biology, an adaptation is defined as _____.
Answer:
Adaptation, in biology, the process by which a species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation over several generations.