Lock and key theory states that enzymes have a specific shape that directly correlates to the shape of the substrate.
What is the lock and key theory of enzymes?Enzymes are globular protein that catalyses a biological chemical reaction.
One of the characteristics of enzymes is that they are usually substrate-specific i.e. They bind and act to a particular substrate.
This characteristics is explained by the lock and key theory of enzymes, which states that enzymes have a specific shape that directly correlates to the shape of the substrate.
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generally speaking, fossils can form when organisms choose one: a. travel over gravels and leave imprints. b. are preserved in recrystallized limestone called marble.
Fossils can form when organisms travel over gravels and leave imprints.
How fossil can formed?Fossils are formed when a living organism i.e. plant or animal dies and quickly buried by sediment. When burred into the soil they leave their imprint on the surrounding environment.
So we can conclude that fossils can form when organisms travel over gravels and leave imprints.
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(02.07 MC)
The table below shows population data for a particular country in 2010:
Population (millions) 40.5
Births (per 1,000)
30
Deaths (per 1,000) 3
Total Fertility Rate 3.3
Infant Mortality Rate
(per 1,000 births)
Which of the following would explain why the total fertility rate is 3.8 five years later?
2
O A governmental policy to ensure replacement-level fertility remains constant even though there is no change in death rate.
Females are being given fewer educational opportunities so there is a reluctance to have children.
Couples are able to settle down at younger ages and quality of life has improved in the nation.
O The birth rate is determined to be 28 births for every 1,000 individuals five years later.
Option D seems to provide the most information about the total fertility rate, which is 3.8 five years later.
Why does fertility decline over time?A variety of factors contribute to the decline in fertility rates. One of the factors is primarily due to job changes, reproductive health issues, and other factors.
Thus, the answer is option D is the mathematical option that best explains the total fertility rate of 3.8 five years later.
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Halophilic bacteria possess a pigment related to ____________ that absorbs solar energy to pump chloride ions, keeping them alive under such saline conditions.
Halophilic bacteria possess a pigment related to the plant's chlorophyll.
Halophilic bacteriaThey are bacteria that live in high salt environments. They have a certain feature that enables them to pump out salts in order to maintain normal osmotic conditions in their bodies.
Halophilic bacteria are equipped with bacteriorhodopsin and halorhodopsin. These enable them to photosynthesize like plants. and generate the much-needed ATP for pumping out salts.
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Which of the following energy is converted into chemical energy by the chlorophylls?
Thermal energy
Light energy
Heat energy
Nuclear energy
Answer:
light energy
Explanation:
Plants take in sunlight given off by the sun to make food during photosynthesis
Answer: Light Energy
Explanation: Chlorophyll absorbs light energy for photosynthesis
Write about the importance of exothermic reactions in daily life and illustrate the destruction caused by their absence
Everyday uses of exothermic reactions include self-heating cans and hand warmers. When energy is taken in from the surroundings, this is called an endothermic reaction and the temperature of the surroundings decreases.
Which cellular process do scorpions most likely go through to
produce ATP?
A) anaerobic respiration
B) alcohol fermentation
C) lactic acid fermentation
D) aerobic respiration
Answer:
D) aerobic respiration
Explanation:
What is the term for thin, stained slice of tissue mounted on a microscope slide?
The correct term is histological section.
What are histological sections?Histology has to do with the study of tissues. Sectioning has to do with cutting very thin slices of objects.
Thus, histological sectioning is an act of cutting very thin slices of tissues for the purpose of mounting such on microscope slides. To enhance views and differentiate different parts of cells, sections of tissues are often stained.
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Describe the processes that occur after pollination, including fertilisation and seed formation.
Answer:
Step one: After pollen has landed on the stigma, it grows a pollen tube down through the style to the ovary. Step two: The nucleus of the pollen grain travels down the pollen tube and fertilises the nucleus in the ovule. Step three: The fertilised ovule develops into a seed.
hope it helps.
In part of the model, materials move out of the bag and into the water. which
of the following cell processes does this best model?
a. substances move from an area of low concentration to an area of
high concentration.
b. small molecules easily pass between the phospholipids in the cell
membrane.
c. transport proteins use energy to push large molecules across the
cell membrane.
o d. a vacuole opens to release substances into the area outside the
cell.
previous
Answer:
small molecules easily pass through the phospholipids in the cell membrane
What is the structure and function of microtubules?
Structurally microtubules are composed of alpha and beta-tubulin, whereas their functions include cell division, structural support, etc.
What are microtubules?The microtubules are key proteins present in eukaryotic cells that form part of the cytoskeleton.
Microtubules are composed of subunits of alpha and beta-tubulin that link together to form structures 24 nm thick.
In conclusion, structurally microtubules are composed of alpha and beta-tubulin, whereas their functions include cell division, structural support, etc.
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Describe the position and attachments of the parietal pericardium of the heart of the fetal pig.
The position and attachments of the parietal pericardium of the heart of the fetal pig is; The parietal pericardium is a very thin layer on the outside surface of the heart.
What is the parietal pericardium of the heart?The Parietal pericardium is a serous membrane that secretes serous fluid to lubricate heart and reduce friction.
The Parietal pericardium acts as mechanical protection for the heart and big vessels, and a lubrication to reduce friction between the heart and the surrounding structures.
The description of the position and attachments of the parietal pericardium is that is a very thin layer on the outside surface of the heart.
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What are two sides of the Golgi body
Which of the following describes the characteristics of the offspring of a
cross between pure-breeding tall plants?
A. There is not enough information to answer the question.
B. They will all be short.
C. Some will be tall, and some will be short.
D. They will all be tall.
If a human has an X and a Y chromosome pair, they are Otrue-breeding O female Ohybrid O male
Answer:
They are a male.
Explanation:
Discuss the importance of legislation to protect marshes.
The role of the legislation is to make and pass laws that will be followed by the citizens of the nation.
In this capacity, the legislation may declare endangered marshes under the protection of the government and impose penalties to those who trespass on government lands.
How marshes area help in eliminating pollution?1. Wetlands help in eliminating pollutants and thus helps in bioremediation.
2. The wetlands assist in reducing the frequencies of erosion and floods. The wetlands function as a sponge and captivate the majority of the water at the time of heavy rainfall, which gets released gradually. This, in turn, helps in replenishing the groundwater level.
3. Different kinds of species like insects, plants, reptiles, microbes, and reptiles thrive in wetlands, thus, forming a food web.
4. Wetlands also donate to the economy of the country by providing timber, fish, rice, berries, and other things of medicinal values.
Thus, this could be the answer.
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Which membranous structures conduct impulses through the sarcoplasm to stimulate the release of calcium?.
What are the adheres junctions?
Adherens junctions (AJs) are defined as cell-cell adhesion complexes that are progressively assembled and disassembled.
What are Adherens junctions?Adherens junctions (AJs) are defined as cell-cell adhesion complexes that are progressively assembled and disassembled. This assembling operation allows cells within a tissue to respond to forces, biochemical signals as well as other structural changes in their microenvironment.
The functions of Adherens junctions are;
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Acid precipitation can dissolve aluminum from soil. As aluminum is dissolved, it can flow into lakes and contaminate the water. High concentrations of aluminum in
lakes is fatal to many forms of aquatic life. This scenario provides evidence for which of theseconcepts?
A. Environmental change always has a negative impact on organisms.
B. Acid rain is the most important environmental problem to address.
C. Acid rain is the leading cause of death to fish in lakes.
D. Environmental change can impact the quality of life for living organisms.
The scenario described provides evidence for option D: Environmental change can impact the quality of life for living organisms.
The passage explains how acid precipitation, commonly known as acid rain, can dissolve aluminum from soil. This dissolved aluminum can then flow into lakes, resulting in contamination of the water.
High concentrations of aluminum in lakes can be fatal to many forms of aquatic life. This evidence supports the concept that environmental change can have a detrimental impact on living organisms.
Option A is incorrect because the passage does not suggest that environmental change always has a negative impact on organisms. While the scenario highlights a negative consequence of acid rain on aquatic life, it does not generalize this impact to all environmental changes.
Option B is also incorrect because the passage does not claim that acid rain is the most important environmental problem to address. It solely focuses on the specific issue of aluminum contamination in lakes due to acid rain.
Option C is incorrect because the passage does not state that acid rain is the leading cause of death to fish in lakes. It highlights the detrimental effect of high aluminum concentrations, but it does not compare it to other potential causes of fish death in lakes.
Therefore, the most appropriate concept supported by the scenario is option D, which acknowledges that environmental change can impact the quality of life for living organisms based on the example of aluminum contamination in lakes due to acid precipitation.
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The ability of muscle to shorten forcibly when adequately stimulated is known as ________, and sets muscle apart from other tissue types.
Answer: Contractility
Explanation:
The ability of muscle to shorten forcibly when adequately stimulated is known as contractility, and sets muscle apart from other tissue types.
One reason biodiversity is such an important aspect of sustainability is that it ____. Group of answer choices provides vital ecosystem services through the interactions among species and keeps any population from growing too large maintains a ready supply of new materials for water, soil, and food makes life less susceptible to constant adaptation and changing environmental conditions is the ultimate source of energy for plants increases ecotourism in less developed countries
One reason biodiversity is such an important aspect of sustainability is that it provides vital ecosystem services through the interactions among species and keeps any population from growing too large (option A).
What is biodiversity?Biodiversity refers to the number and variety of species of plant and animal life within a region.
Sustainability is the means of configuring civilization and human activity so that society, its members and its economies are able to meet their needs and express their greatest potential in the present without compromising the ability of future generations to do the same.
Biodiversity helps to ensure sustainability because it provides vital ecosystem services through the interactions among species and keeps any population from growing too large.
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Accumulation of blood in the abdominal cavity will most likely cause:
According to the research, accumulation of blood in the abdominal cavity will most likely cause distention.
What is distention?It is the dilated state of organic cavities (abdomen), hollow organs (intestine, stomach, pericardium, abdomen, bladder, gallbladder, vena cava) and solid organs (hepatic capsule, etc.).
In this state the abdominal cavity can experience a certain degree of enlargement of its contents without rupturing.
Therefore, we can conclude that according to the research, accumulation of blood in the abdominal cavity will most likely cause distention.
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The first true antibiotic was __________, which was discovered by __________. View Available Hint(s)for Part A streptomyces; Selman Waksman penicillin; Alexander Fleming arsenic compounds; Paul Enrich sulfanilamide; Gerhart Domagk
Answer:
penicillin, Alexander Fleming
Organisms with the most beneficial traits will survive. This is commonly known as.
Answer:
O Ecosystem which is survival of the fittest.
Explanation:
Answer:
Natural selection
Explanation:
Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing,
while whales and dolphins have lungs. These differences indicate that the organisms share common ancestor for
v
Whales also possess a vestigial pelvic bone. The presence of the pelvis bone may indicate that whales?
Ans These differences show that they belong to a same kind of species. But in science whales are categorized as mammal
Explanation:
the left brain hemisphere receives sensory input from the _________ and sends motor commands to the _________.
The left brain hemisphere receives sensory input from the right side of the body and sends motor commands to the right side of the body.
What are brain hemispheres?The brain hemispheres are two main parts in which the brain or cerebrum can be divided.
It is well known that the brain hemisphere functions are opposite in direction of functions, i.e. the right hemisphere controls the left and vice versa.
In conclusion, the left brain hemisphere receives sensory input from the right side of the body and sends motor commands to the right side of the body.
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What is the triad of anaesthetics?
The Triad of anaesthetics as required in the task content are; Narcosis, Analgesia and Muscle relaxation.
What is the Triad of anaesthetics?The triad of anaesthetics as the name implies contains the stage of narcosis, analgesia and finally muscle relaxation and hence, acting on each one of the triad with selective drugs helps to avoid deep levels of central brain depression.
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1. List four sensations detected by the tactile receptors in the skin in the spaces below:
The four sensations detected by the tactile receptors in the skin are touch, pressure and vibration and tickle.
What are the 4 sensations that the receptors found in the skin have?They are nerve endings formed by a branched axon. They are distributed in almost all parts of the body and capture mechanical (pressure), thermal (cold and heat) and especially painful sensations.
This is because Tactile sensations are the ones that detect touch, pressure, and vibration. About six different types of tactile receptors are known.
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One thing all mechanisms of evolution have in common is that ____________________.
They all lead to beneficial change in the population
They all lead to positive change in the population
They all lead to change in the population
They all lead to detrimental change in the population
Answer:
they lead to positive change in the population
What accurately describes a difference between fungi and plants?
Fungi are different from plants in that they are achlorophyllous.
Fungi vs plantsFungi and plants are both eukaryotic in nature when it comes to their cells.
However, plants differ from fungi in that plants contain a green pigment known as chlorophyll while fungi do not. The green pigment enables plants to photosynthesize.
Thus, fungi are said to be achlorophyllous.
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In a microbiology laboratory, what does culturing mean?.
Answer: fungi parasites and viruses can be grown in a lab when appropriate conditions are met
Explanation: The precise characteristics of the growing culture can be used to identify the specific microbe
