Pls help (7th grade science)

The value in micrometers is 7.5 * 10^2 µm.

We know that it is possible to convert from one unit to another by the use of conversion factors. The conversion factor must be dimensionally correct in order to work and help us to make the required conversions.

Now we must first convert from millimeter to meter using;

0.75 mm * 1 m/1000 mm

Then we have the value as 7.5 * 10^-4 m

Then we convert to micrometer

7.5 * 10^-4 m * 1 * 10^6 µm/1 m

=7.5 * 10^2 µm

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Answer:

symbiotic associations between photosynthetic organisms and fungi

Explanation:

The two factors likely contribute to the evolution of semelparity versus iteroparity are survival rate of offspring and likelihood of adult surviving to reproduce again.

Low survival rate of children in unstable conditions results in semelparity if preferred. Environments with stability: iteroparity is preferred

Adults have a lower survival rate in unpredictable or changing surroundings; however, if they have a large number of offspring, there is a better chance that some of them will live.

Adults are more likely to survive and procreate in stable surroundings, which increases competition and leads to the production of few but large offspring and increased parental care.

Any living things have two different reproductive options : semelparity and iteroparity. A species is categorized as a iteroparous if it experiences several reproductive cycles throughout semelparous if it only displays one reproductive event before dying, and otherwise.

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The gene sequences for both of the taxa plus those of several related taxa is needed to calibrate a molecular clock and use it to estimate the time that has passed since two species shared a common ancestor.

The molecular clock is a figurative time period for a way that makes use of the mutation fee of biomolecules to deduce the time in prehistory at the same time as two or extra lifestyles office work diverged. The biomolecular statistics used for such calculations are generally nucleotide sequences for DNA, RNA, or amino acid sequences for proteins.

In choice to measuring seconds, minutes and hours, says Hedges, Penn nation professor of biology, the molecular clock measures the huge style of changes, or mutations, which acquire in the gene sequences of diverse species through the years.

An ideal molecular clock has a number of capabilities fee fidelity via time, fee homogeneity throughout lineages, taxonomic breadth and applicability, and accessibility of the statistics. Characters which have superior at a exceedingly steady fee are the maximum appropriate for molecular.

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Active transport is used by the cells for the accumulation of required molecules. This type of transport is energy-dependent. The movement of molecules is against the gradient.

Active transport is the movement of molecules or ions across the cell membrane from its lower concentration to its higher concentration. This movement is favored by energy in the form of ATP.

The two main types of active transport includes: Primary Active Transport and Secondary Active Transport. Primary Active Transport involves the direct use of ATP while the Secondary Active Transport involves coupling of molecules with other molecules moving along an electrochemical gradient.

Therefore, Active transport is involved in the movement of substances against the concentration gradient.

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If the sodium-gated channels are inactivated, the refractory period will be longer due to a drop in maximum frequency.

The fast depolarization that underpins the upstroke of action potentials in neurons is caused by voltage-gated sodium channels, which are transmembrane proteins and hence essential for the transmission of nerve impulses. Voltage-gated sodium channels play a critical role in electrogenesis, and variables that reduce their activity can have a significant impact on axonal conduction. In fact, numerous distinct therapeutically beneficial medications, including local anesthetics and anticonvulsants, reduce neuronal excitability by inhibiting the activation of voltage-gated sodium channels.

Therefore, the inactivation of sodium-gated channels would result in a longer refractory period due to a drop in maximum frequency.

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Some elastic and collagen fibres can be found in the alveoli. The alveoli may extend when they fill up with air during inhalation thanks to the elastic fibres.

The lungs also enlarge inside the chest cage due to the loss of elastic tissue from the walls of the damaged alveoli. Small bronchi are compressed by the enlarged lungs, which raises airflow resistance.

Reduced alveolar elastic fibres will result in less elastic rebound, but diminished alveolar attachments to the airways will result in diminished support for the small airways and increased constriction of the small airways during expiration.

The air sacs' inner walls deteriorate and tear with time, resulting in the creation of fewer, bigger air gaps as opposed to more, smaller ones.

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Genetic variations account for a sizable portion of variation in migratory behaviour as well as in physiological and morphological adaptations to migration. Comparative research indicates that various lineages have separately and quickly evolved migratory behaviour.

In evolutionary time, migration will often quickly converge gene frequencies among populations. Migration is a powerful mechanism for balancing the gene frequencies of subpopulations in a species in the absence of selection. Gene frequencies will ultimately equalise if the migration rate is larger than zero.

Animals move across habitats in a pattern called migration in pursuit of food, better living conditions, or reproductive requirements.

An intrinsic activity known as migration is the long-distance seasonal travel.

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Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane is true.

The import of iron into a mammalian cell is another instance of receptor-mediated endocytosis. In general, iron is not imported into the cell by itself, similar to how serum cholesterol is. Instead, it is bonded to the serum protein apotransferrin, which binds two Fe3+ ions.

By the inward budding of the plasma membrane, a process known as receptor-mediated endocytosis (RME), also known as clathrin-mediated endocytosis, cells can absorb metabolites, hormones, proteins, and occasionally viruses (invagination).

This process, which is solely mediated by receptors on the cell surface, creates vesicles containing the ingested chemicals. This procedure only allows chemicals that are receptor-specific to enter the cell.

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The statement that best describes an example of how society influences science and engineering is the Government's funded research to reduce the spread of mosquito-borne illnesses. The correct option is D.

Science is a subject that unravels the secrets of nature and the universe. They study all things about the earth.

Engineering is a subject that works for things that are made of dimensions. They are of different branches like electrical, mechanical engineering, etc.

Therefore, the correct option is D. Government's funded research to reduce the spread of mosquito-borne illnesses.

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The question is incomplete. Your most probably complete question is given below:

A. People who prevent mosquito bites by using mosquito netting have a lower risk of illness.

B. Many people believe the benefits of using genetically modified organisms outweigh the risks.

C. Researchers found that the Aedes aegypti species of mosquito was responsible for transmitting diseases such as malaria.

D. Government's funded research to reduce the spread of mosquito-borne illnesses.

For ambient temperatures within the thermoneutral zone of an endotherm, a decrease in environmental temperature leads to increased vasoconstriction without a change in metabolic rate : True.

In mammals, the link between temperature and metabolic rate is direct. Ectotherms, as well as endotherms, as well as endotherms, are both impacted by cold temperatures, however, endotherms experience an increase in metabolism as a consequence of increased movement to stay warm, whilst ectotherms experience a drop in metabolism as a result of cold temperatures.

A body's response to temperatures just below thermal neutral zone, known as cold stress, would be a property shared by all endotherms. When the outside temperature falls underneath an animal's thermal neutral zone, the metabolic rate of the body increases, resulting in thermogenesis, which raises body temperature.

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Imagine planting a Sonic Hedgehog bead in the center of the bud after it has been wet. The developing limb in that instance would most likely be a mirror-image duplicate, with the most anterior digits at each end and the most posterior digits in the middle. As a result, a mirror-image duplicate would arise.

A complex signaling network that regulates tightly regulated developmental processes in multicellular organisms is the Sonic Hedgehog (Shh) signaling cascade. Lower concentrations of Shh in a bead will result in a reaction like that seen after a tissue transplant.

Let's say a mirror-image limb is produced when the Sonic Hedgehog is injected into the front portion of a conventional limb bud. The studies with mice also demonstrate that the sonic hedgehog can produce additional toes in a region of the limb bud where it is often absent.

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To conserve water, salt water fish produce urine that is hypertonic with respect to the ECF) is INCORRECT.

Hypertonic an infant with extreme tone or tension hypertonic bladder having a higher osmotic pressure than the environment or a comparable fluid. When cells are hypertonic, RVI is the immediate response.

It leads in a high intracellular inorganic salt concentration that can disrupt cellular function and structure while also increasing the intake of inorganic salts and the osmotic input of water.

A hypertonic solution is one that has more dissolved particles than normal cells and blood do, including salt and other electrolytes. For instance, hypertonic solutions are used to soak wounds.

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decided 19 × 1080 add that to 2097 + flip

Answer:

Carbon moves from living things to the atmosphere.

Each time you exhale, you are releasing carbon dioxide gas (CO2) into the atmosphere. Animals and plants get rid of carbon dioxide gas through a process called respiration.

Explanation:

Carbon is the element found in all organic molecules. During respiration, animals excrete carbon dioxide as gas.

Respiration is a metabolic process that occurs in all living organisms. In respiration, oxidation of organic carbon compounds occurs which results in the production of carbon dioxide, water, and energy.

Respiration is of two types aerobic and anaerobic respiration. In aerobic respiration oxidation of organic compounds takes place in presence of oxygen whereas, In anaerobic respiration, oxygen is absent. For example, alcohol fermentation is anaerobic respiration and glycolysis is aerobic respiration.

In respiration, living organisms take oxygen in and respire carbon dioxide out along with the evolution of energy.

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According to the research, the correct option is association. The prefrontal cortex is an example of association area of ​​the cerebral cortex because it is involved in higher-level thinking rather than primary motor or sensory functions.

It comprises a set of neurons that cluster in the most anterior part of the frontal lobe, to fulfill functions related to working memory, thinking and the control of some emotional states.

In this sense, it is considered an association area since it controls emotions that include aggression, as well as participates in thinking, problem solving, decision making, and information from other brain areas.

Therefore, we can conclude that according to the research, the correct option is association. The prefrontal cortex is an example of association area of ​​the cerebral cortex because it is involved in higher-level thinking rather than primary motor or sensory functions.

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In 1939, Heinrich Klüver and Paul Bucy surgically lesioned a structure called the amygdala in the brain's limbic system, thereby eliminating defensive responses in various mammal species.

This is referred to as the central organ of the nervous system and contain millions of nerve cells which transmits signals to it from various sensory organs for processing. The brain and the spinal cord make up the central nervous system and have their various functions.

The amygdala is referred to a part of the brain which is primarily responsible for decision making and emotional responses and was lesioned in an experiment by some scientists.

This led to the elimination of defensive responses due to a lack of emotion being encountered by the set of mammals which were used for this procedure and is therefore the reason why it was chosen as the correct choice.

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The advantage of introducing genes into germ cells rather than somatic cells is germ cells would be passed on to gametes and future generations.

What are germ cells?

Any biological cell that develops into gametes in a sexually reproducing organism is referred to as a germ cell. Many animals have germ cells that begin in the primitive streak and go through the gut of the growing embryo to the gonads. There, they go through meiosis and then differentiate into mature gametes—eggs or sperm—via cellular processes. Plants do not identify germ cells throughout early development, in contrast to animals. Instead, somatic adult cells, like the floral meristem of flowering plants, can give rise to germ cells.

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Option E: long linear chain of mountains on the sea floor is associated with a HOT SPOT.

A hot spot develops volcanoes on the sea floor due to the presence of melted mantle there. Volcanoes are like mountain-like fissures in the crust of the earth through which gases, lava, and volcanic ash can escape. Pressure from dissolved gases contributes to the force of some volcanic eruptions.

A hot spot is a region of the Earth's mantle that is extremely hot. The hot spot's heat source is located quite deep into the planet. The mantle in that area melts as a result of this heat. A volcano is created when molten magma rises and penetrates the crust.

According to a competing plate theory, the crust above a hotspot is particularly weak or thin, not abnormally hot, and this allows the lithospheric extension to passively cause melt to rise from shallow depths. The geologic features associated with various plate boundaries include deep ocean trenches, Island arcs, volcanoes, submarine mountain ranges, and fault lines.

As the hot spots do not involve geological features like trenches, Island arcs, won't valleys, and mountain ranges with high plateaus, but are the features of plate boundaries. Option E is the correct answer.

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Answer:

It is necessary.

Explanation:

We need sugar to put in our cells. The insulin breaks the sugar from our blood to do so. Sugar is very important that's why people with diabetes type 1 eat a little bit more than others because they need the sugar, but too much sugar is also bad, so you need a control of it.

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The condition of the active tissues permits the Bohr effect to efficiently enhance the offloading of oxygen to functional tissues. The active tissues exhibit localized elevated partial pressure, resulting in increased carbon dioxide and decreased pH.

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The process of translation makes a protein from an mRNA. The protein is made by the peptidyl transferase which catalyzes the peptide bond between each amino acid.

The process of translation converts the information carried by messenger RNA from DNA into a sequence of amino acids joined by peptide bonds. Initiation, elongation, and termination are the three main phases of translation. The enzyme peptidyl transferase is in charge of creating peptide bonds while protein synthesis is taking place. This enzyme activity catalyzes the formation of a peptide bond from an ester bond between the amino group of the aminoacyl-tRNA in the A site and the carboxyl carbon of the peptidyl-tRNA in the P site.

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The results show that the early nonvascular plants could have be caused enough chemical weathering of the rock and to reduce the atmospheric CO2 levels.

The Chemical weathering involves the interaction of the rock with the mineral solutions (chemicals) to change the composition of the rocks. In this process, the water interacts with the minerals to create the various chemical reactions and to transform the rocks. the Chemical Weathering Chemical weathering changes the molecular structure of the rocks and the soil. For instance, the carbon dioxide from the air or to soil sometimes that combines with water in a process called carbonation. This produces a weak acid, as called carbonic acid, that can also dissolve rock.

This is incomplete question the complete question is:

How do these experimental results and models demonstrate that life has profoundly changed the Earth?

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The population growth rate for the same four cases rate will double.

ΔN/Δt = rinst N (K-N) / K

1,510(1,500-1,510)/1,500 = -20

1,600(1,500-1,600)/1,500 = -213

1,750(1,500-1,750)/1,500 = -583

2,000(1,500-2,000)/1,500 = -1,333

The annual increase in the number of people worldwide is roughly 83 million, or 1.1%. By 2020, there will be 7.9 billion people on the planet, up from 1 billion in 1800.

To commemorate this achievement, the 7 Billion Actions global campaign was established. From 7.7 billion today to 9.7 billion in 2050, and possibly reaching a peak of over 11 billion people in 2100, the world's population is projected to grow by 2 billion people over the next 30 years.

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Analogous structures accomplish the same function. However, they have different embryological origin, the elements composing them are different, and individuals carrying them are not closely related. ANALOGY.

Homologous characters are structures that have

These structures might show variations between the organisms exhibiting them. Variations might be related to their function and the environment in which the organism lives. Their function is not necessarily the same in all the organisms involved.

These homologous characters are present in organisms related that share a common ancestor.

Analogous structures are those body parts of different organisms that accomplish the same function, but they are originated from different areas.

These structures do not share the same embryological origin.

According to this information, an owl's wing and a hornet's wing are analogous structures.

This example respresents ANALOGY.

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Answer:

Disulfide bridges, which aid in the formation of the protein's tertiary structure, require cysteine residues.

Explanation:

A singular peptide chain and protein secondary structural features make up a protein's three dimensional or tertiary structure. A protein's tertiary structure is controlled by side chain connections and bonding.

Disulfide bridges, which are created by cysteine, join the pieces of a polypeptide chain together. Regarding their fundamental structure, such fragments can frequently be found at great distances from one another. Therefore, a protein's three-dimensional form is its tertiary structure.

Disulfide bridges are crucial for keeping the protein's three-dimensional- dimensional or tertiary structure. In an oxidizing atmosphere, disulfide production is promoted, but in a reductive environment, this disulfide bridge might be destroyed.

WHAT MAKES CYSTEINE DIFFERENT?

since its side chain contains a highly reactive sulfhydryl component. As a result, cysteine occupies a unique location and cannot be taken by another amino acid because the disulfide bridges that cysteine residues create are a constant part of the core structure of proteins.

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mendel crossed plants with one trait variant with the alternate and produced hybrid plant  , which are offspring that inherit a different gene variant from each parent.

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Cell signaling can  divided into the 3 stages.

Reception: A cell detects the signaling molecule from the outside of the cell. the Transduction: When the signaling molecule was binds the receptor it can changes the receptor protein in some way. the Response: Finally, the signal was triggers with a specific cellular response. The process by which the cell responds to the substances outside the cell through the signaling molecules found on the surface of the and inside the cell.

The Cells typically receive signals in chemical form via the various signaling molecules. When the signaling molecule joins with the appropriate receptor on the cell surface, this binding was triggers a chain of events that was not only carries the signal to the cell interior, also but amplifies it as well.

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