Stromatolite fossils that formed 3.5 billion years ago indicate that _____.
Final answer:
Stromatolite fossils from 3.5 billion years ago indicate the presence of early life forms engaging in photosynthesis, particularly cyanobacteria. These formations reveal the beginnings of oxygen production and the ability of life to shape the planet's geological and atmospheric history.
Explanation:
Stromatolite fossils that formed 3.5 billion years ago indicate that early life forms, most likely photosynthetic, already existed on Earth. Stromatolites provide evidence for some of the earliest communities of photosynthetic bacteria, such as cyanobacteria, which were capable of oxygen-producing photosynthesis. The discovery of these ancient fossils, particularly from locations like the Strelley Pool Formation in Western Australia, supports the idea that life began in aquatic environments with the capability to harness energy through photosynthesis, leading to the production of oxygen and the formation of layered rock structures by trapping sediment and forming calcium carbonate layers.
This photosynthetic activity is essential, as it suggests the existence of organisms that used dissolved CO₂ in water to form sugar molecules and precipitated calcium, culminating in the growth of stromatolite formations. The cyclical nature of the growth of these ancient microbial colonies, with living cells continuously forming layers atop hardened calcium carbonate, resulting in the characteristic ringed pattern observed in stromatolite cross-sections.
Scientists discovered bacteria for the first time in the 1920s true or false
The correct answer is False
Explanation:
In biology, bacteria are unicellular and prokaryotic organisms as they do not contain a nucleus. Bacteria are mainly characterized by their simple structure, the capability to survive in almost any environment and small size.
In terms of discovery, bacteria were unknown for many centuries; however, this changed in the 17th century as the Dutch scientist Van Leeuwenhoek designed a microscope and was able to observe a bacteria for the first time in 1676. This also led to subsequent studies and in this way nowadays there is a lot of information about this type of microorganism. According to this, it is false scientists discovered bacteria for the first time in the 1920s as bacteria were discovered in 1676.
Simple carbs can be divided into 2 subgroups. what are they? what are the 3 "single" sugars? what is the technical name for "single sugar"? what is the name of the single sugar that is always found in the blood?
Which event in the cross bridge cycle occurs immediately after the cross bridge binds to actin? power stroke?
The highest rates of illicit drug use occur among adults aged ________.
Answer:
18-20 years
Explanation:
The highest rates of illicit drug use occur among adults aged __18-20 years__.
A recent study was conducted by scientist in which they observed highest illicit drug use among teenage adults. Here is the reference to that paper:
Egan, K. L., Suerken, C., Debinski, B., Reboussin, B. A., Wagoner, K. G., Sutfin, E. L., & Wolfson, M. (2019). More than just Alcohol: Marijuana and Illicit Drug Use at Parties Attended by 15–20 Year Olds. Substance use & misuse, 54(2), 297-306.
Parkinson disease is specifically associated with low levels of the neurotransmitter _____.
Part c - how does phospholipid structure relate to the selective permeability of the plasma membrane?
a. True
b. False: our epigenetic code is inherited by the passing of dna sequences.
22 as a group discuss the opening analogy of an efficiency apartment and a mansion as it relates to cells. record your final consensus of how this analogy applies to cell structure
The efficiency apartment and mansion analogy relates to cell structure by comparing the simplicity and lack of specialized areas of prokaryotic cells to an efficiency apartment, while the complex, specialized structure of eukaryotic cells with organelles resembles a mansion.
Explanation:When discussing cell structure and its relation to efficiency, the analogy comparing an efficiency apartment to a mansion is quite fitting. An efficient apartment, with its limited space and resources, must have highly organized arrangements and often multifunctional components to maintain functionality in a small area. This is similar to prokaryotic cells, which lack specialized structures called organelles and have to carry out all processes in one space. On the other hand, a mansion has ample space, allowing for specialized rooms (analogous to organelles) where specific activities can take place without interfering with each other. Such is the case in eukaryotic cells, which have developed organelles that perform specific tasks, increasing the cell's efficiency and ability to capture, store, or use free energy.
Therefore, the consensus on the analogy is that it reflects the difference between cells that have a simpler structure with less specialization (prokaryotic cells, akin to an efficiency apartment) and those with complex, specialized structures allowing for greater efficiency and functionality (eukaryotic cells, similar to a mansion).
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In living things, dehydration synthesis reactions result in the formation of
Answer:
polymers
Explanation:
In living beings, the reactions of synthesis of dehydration result in the formation of polymers.
Dehydration is the clinical condition characterized by the state in which the body experiences a lack of water and mineral fluids, components necessary to organize chemical reactions and the proper functioning of bodily functions.
This condition is quite common in children and the elderly, as their immune systems are poorly strengthened, and it occurs mainly in certain times of the year, such as summer. It can also be caused due to the maintenance of unhealthy lifestyles, infections by viruses or bacteria and negligence regarding water consumption.
Turfgrasses can tolerate a very wide soil ph range, but they do best in one that is slightly acidic.
Suppose that the number of kinds of lichens at a city park s decreasing each year. What might explain this disappearance?
Which feature of promoters can be found in both prokaryotes and eukaryotes?
Kyle had a brother who exhibited heart disease at age 62 and a sister who exhibited heart disease at age 64. based on the age at which his brother and his sister exhibited heart disease, is kyle considered to have a family history of heart disease?
Answer:
Yes, Kyle has a family history of heart disease.
Explanation:
A family history is a record of health information about a person and their close relatives. Having relatives with a health problem does not mean that you will develop this condition, but the chances increase. This is because families have many factors in common, including genes and often the environment and lifestyle.
Two of Kyle's brothers developed heart disease, so we can say that Kyle has a family history of heart disease.
_____ helps regulate water and electrolyte balance.
Can animals cells and plants cells do photosynthesis?
in order to obtain energy plants must do what
Why is there disagreement on drilling oil reserves in the Arctic National Wildlife Refuge (ANWR)? A) The disagreement stems from a need to remove more nonrewable resources from an area set aside for the ecological health of wildlife. B) The disagreement is about how much oil is actually in ANWR. C) There is no disagreement concerning ANWR supply. The disagreement is about the drilling expense, removal costs, and whether or not the government will subsidize the oil industry.. D) The disagreement is among nuclear waste enthusiasts who want to store their waste, oil companies that want to extract oil, and indigenous people who want to keep their hunting territories. E) There is no disagreement about this area because it is already preserved for wildlife.
What enlightenment principles did the state constitutions all put into practice?
Is it conceivable that these two reagents would react with each other? what experimental evidence do you have to support your answer?
What will the radicle become as the seed develops into an adult plant?
a. the root
b.the flower
c.the stem
d.the leaf?
Answer: a. the root
Explanation: As the seed develops into an adult plant, the radicle becomes the root. The radicle is defined as the rudimentary shoot of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the root of the embryo (a rudimentary plant contained in the seed). It is also known as a rootlet.
What happens to the mitochondrial membrane potential in hd patients? why might that lead to a change in the membrane's ability to release calcium into the cytoplasm?
Which type of protein makes up connective tissue?
A. Fatty acid
B. Amino acid
C. Globular protein
D. Fibrous protein
Type of protein makes up connective tissue is Fibrous protein.
The correct option is D.
Connective tissue is primarily composed of fibrous proteins. These proteins provide structural support and strength to connective tissues. The two main types of fibrous proteins found in connective tissue are collagen and elastin.
Collagen is the most abundant protein in the human body and is responsible for the tensile strength and flexibility of connective tissues. It forms a fibrous network that gives connective tissue its structural integrity. Elastin, as the name suggests, provides elasticity to tissues. It allows connective tissues to stretch and recoil, providing resilience and the ability to return to their original shape after being stretched.
Hence , D is the correct option
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What provides instructions to a prokaryotic cell about living and growing?
A. Capsule
B. Ribosomes
C. DNA
D. Nucleoid
In the linnaean taxonomy, how do you know that humans are closely related to chimpanzees?
How many liters of cold water (4C) would you have to drink to “burn” 99 kilocalories go warm the water up to body temperature (37C) ?
Why was the evolution of vascular tissue important to plants conquering the land?
The evolution of vascular tissues enabled plants to transport water and nutrients efficiently, grow larger, and effectively compete for sunlight in terrestrial environments.
The evolution of vascular tissue was significant for plants' conquest of land, as it allowed them to transport water and minerals from soil to leaves, essential for photosynthesis, and distribute food throughout the plant. This system, composed of xylem and phloem, enabled plants to grow taller and larger, thus outcompeting nonvascular plants that were limited to moist environments and a shorter stature.
The ability to grow taller was beneficial for light capture, and the structural support provided by lignified tissues helped plants thrive in terrestrial ecosystems, resulting in diverse and complex plant life on land.
Underwater earthquakes may cause which of the following
Hurricane
Asteroid impact
Tsunami
Volcano
The legs of a human and the limbs of a cat are similar in structure. These structures are called ______ vestigial homologous analogous structures. This similarity indicates that ________humans evolved from cats cats evolved from the ancestors of humans cats and humans share a common ancestor .
1) A. Vestigial B. Homologous C. analogous
2) A. Humans evolved from cats B. Cats evolved from ancestors of humans C. Cats and humans share a common ancestor.
Answer: The correct answers for the fill in the blanks are-
1) B) Homologous structures.
2)C). Cats and humans share a common ancestor.
Homologous structures/organs are those parts of two organisms that look similar in their form/structure because they share common ancestor (that is they have evolved from a common ancestor) but due to different adaptation, perform different function.
Example -The legs of a human and the limbs of a cat, which have evolved from a common ancestor.
1.) a patient has diabetes, a disease that causes high blood sugar levels. Which macromolecule will the dietician monitor most closely in a patient that has the disease?
A.) carbohydrates
b) lipids
C.) nucleic acids
D.) proteins
2.) A scientist is examining the function of macromolecules in a cell. She notices movement of large molecules into and out of the cell is disrupted when she damages one specific type of macromolecule. Which molecule has she most likely damaged?
A.) carbohydrate
B) steroid
c)nucleic acid
D) protein
Correct answer choice is :
Carbohydrates, also identified as saccharides or carbs, are sugars or sugars. They are a significant food cause and a key form of energy for most organisms. They consist of carbon, hydrogen, and oxygen atoms. As the sugar level increases in your body, the pancreas delivers a hormone named insulin. Insulin is required to move sugar from the blood into the cells, where the sugar can be used as an energy source.
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Correct answer choice for question 2 is :
Protein is an essential segment of every cell in the body. Hair and nails are frequently made of protein. Your body utilizes protein to build and repair tissues. You also use protein to make proteins, hormones, and other body chemicals. Protein is an essential building block of bones, muscles, cartilage, skin, and blood.
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