12. A fossil was found in a sedimentary rock layer. The igneous layer directly above
the sedimentary layer was analyzed for radioactive uranium. You found equal
amounts of uranium and lead in the igneous sample. This means that the
relative / absolute age of the igneous layer is 704 million years, and the
age of the fossil in the sedimentary rock layer below is older / younger than
704 million years.

A certain type of specialized cell contains an unusually large amount of rough endoplasmic reticulum (ER). Which of the following functions is this cell type most likely specialized to perform?

A. The production and secretion of steroids

B. The destruction of toxic materials produced in other cells of the organism

C. The synthesis of polysaccharides for energy storage

D. The production and secretion of proteins

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BB or Bb is the genotype of the two individuals. More than 90% proportion of their offspring will have black fur.

Black mice must have at least one B allele since the color is dominant. Either BB or Bb could be their genotype.

Because every offspring will have at least one dominant allele for black fur, which will outweigh any allele for brown fur, it is expected that all offspring will have black fur, so the proportion will be more than 90%.

The mix of genes found in the sex cells or gametes (ova and sperm) that were used in a child's conception determines the genotype of that child. From each parent came one sex cell. The gene for each attribute is often only present in one copy in sex cells.

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Answer:

b) Gram-positive bacteria

Explanation:

Gram-positive bacteria stain purple during Gram staining. Gram-negative bacteria turns into red (or) pink. Therefore, the option (b) is the correct answer.

Acetylcholine (ACh), a chemical transmitter, is released into the synaptic cleft. ACh diffuses through the postsynaptic or post junctional membrane and binds to specific receptors there.

Chemical transmitter is defined as a signaling substance that a neuron secretes in order to influence another cell across a synapse. Typically, a transmitter transforms the sensor's output into a signal level fit for a controller's input.

Exercise causes the skeletal muscles to contract and alter. Acetylcholine, a neurotransmitter, is produced from nerve endings and binds to receptors called AChRs on the surface of muscles in (A). Sodium channels activate as a result of the subsequent depolarization, triggering an action potential that travels throughout the cell.

Thus, Acetylcholine (ACh), a chemical transmitter, is released into the synaptic cleft. ACh diffuses through the postsynaptic or post junctional membrane and binds to specific receptors there.

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The Cytoplasm is the location of the most organelles where most cell processes take place.

Answer:

the cytoplasm

Explanation:

Answer:

B. phospholipids

Answer: Phospholipids

Explanation: Phospholipids are a major component of cell membranes. It's also known as a lipid bilayer.

Answer:

the process of oxygen depletion due to nutrients such as nitrogen and phosphorous entering marine systems and causing algal blooms is called Eutrophication

Eutrophication is the oxygen depletion process that occurs due to nutrients such as nitrogen and phosphorus in the marine system resulting in algal blooms.

Eutrophication is a main problem in the aquatic ecosystem. It occurs when the lake or estuaries are rich in nutrients like nitrogen and phosphorus.

The deposition of these nutrients in water bodies occurs because of the surface runoff of agricultural lands.

These nutrients are required by microorganisms, phytoplankton, and algae for their growth. So they consume these nutrients and grow enormously and cover the lake as a green meadow or algal bloom.

So the sunlight or oxygen can't reach underwater. As a result, the aquatic organisms begin to die.

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Atoms bond with other atoms when they need to fill their shell is true .

When two atoms share a pair of electrons, covalent bonding results. In order to increase their stability, which is attained by forming a complete electron shell, atoms will covalently connect with one another. Atoms can stabilize themselves by filling up their outer electron shell by sharing their outermost (valence) electrons.

Atoms, which are very little particles of matter, are what define a chemical element specifically. The core nucleus of an atom is surrounded by one or more negatively charged electrons.

Whatever atoms the shared electrons originally belonged to or how many electrons are involved, a bond is simply the sharing of electrons between two or more atoms to satisfy their demand for an unoccupied final shell.

Hence, your statement about atom is True .

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Answer:

integration in the cerebrum

Explanation:

this is because the reflex arc, which controls the reflex action,occurs in the spinal cord.The ascending neuron only picks the information to inform the brain of what has happened, after it has actually happened

If a child with blood group O is born to the parents with blood group A of father and B of mother, then their genotype will be [tex]I^{A} I^{i}[/tex] and [tex]I^{B} I^{i}[/tex] respectively.

Blood group is the type antibodies and antigens present in the blood of the individual. These antibodies and antigens are heritable and transferred from the parent to the child in the form of genes. There are 4 types of blood groups. These are: A, B, AB and O.

Genotype is the genetic composition of an individual. It can off the whole genome or for a single trait. When the genotype [tex]I^{A} I^{i}[/tex] and [tex]I^{B} I^{i}[/tex] are crossed they have the potential to give birth to a child with genotype [tex]I^{i} I^{i}[/tex], and this justifies the birth of child with blood group O.

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Answer: c

Explanation:

cause

The following events of translational elongation (the stage in translation that occurs after initiation) in the order that they occur, beginning with the first step at the top.  A covalent bond forms between the first and second amino acids.

At some stage in translation elongation, the ribosome ratchets along its mRNA template, incorporating each new amino acid and translocating from one codon to the next. The elongation cycle requires dramatic structural rearrangements of the ribosome.may additionally nine, 2014

Translation elongation calls for particular aminoacyl TRNAs being escorted to the ribosome with the aid of GTP-coupled elongation factor. Elongation calls for movement alongside the ribosome-coupled mRNA, three nucleotides at a time to add amino acids which have been certain to TRNAs.

In the elongation step, the extending of the amino acid sequences and the formation of the amino acid chain is formed. This step is one of the primary and larger steps in translation wherein some of amino acids are delivered to the chain and related collectively with the aid of peptide bonds to form polypeptide bonds.

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The example displaying a type of point source pollution is: (C) untreated water from a factory flowing into a lake

Pollution is the presence of contaminants in the environment. The pollution can be of air, soil, water, or even noise. The major cause of pollution is the human action and synthetic substances but some natural products can also be the causing agent of pollution.

Point source pollution is the one spread through one single source like pipe, ship or factory smokestack that pollutes a larger area. Like untreated water from factories can pollute the entire water body. Similarly chimney smoke of industries can pollute the air of whole city.

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Sedimentary rocks and fossils  are the best evolution rate that describes a fossil record from many different forms of the same organism over a long period of time.

The highly organized order in which fossils are discovered in sedimentary rock layers is known as the fossil record.

It suggests that at least 3.5 billion years ago, there were living forms on Earth.

Fossils, which also show how different species evolved, provide undeniable evidence that ancient organisms were unique from those that exist now. The comparative anatomy of modern animals and fossils make up the morphological, or anatomical, record.

what is sedimentary rocks?

Sedimentary rocks are constructed from pre-existing rocks or remains of extinct creatures. They emerge from deposits that amass on the Earth's surface. Identifiable bedding or layering is typically present in sedimentary rocks.

Therefore, Sedimentary rocks and fossils  are the best evolution rate that describes a fossil record from many different forms of the same organism over a long period of time.

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The Biomes of Bolivia and the world

Biomes are characterized by grouping ecosystems with similar characteristics, in climate, fauna, flora and soil.

¿What is the Biomes of Bolivia and the world?

For Biomes are characterized by grouping ecosystems with similar characteristics, in climate, fauna, flora and soil.

Answer: Chlorophyll

Explanation:

Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide(absorbed from the air) and water into glucose, a type of sugar.

Answer:

i believe its  A.horn

Explanation:

hope this helps ya;)

Answer: the answer is option are option B and C.

Explanation: Proteins are made up of bulk units of amino acids progressively in our body, which are connected to each other as one long chain.

there are 20 different amino acids that compose the proteins, they can be derived from fruits and vegetables.

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Answer: There are five concepts of cystic fibrosis. They have

Explanation:

1. People with CF can't be together.

              The thick, sticky mucus that builds up in our lungs functions like silly puddy. So, when bacteria enter our lungs, they tend to stick around forever whereas healthy people’s immune systems can fight them away. As a result, people with CF harbor dangerous bacteria in their lungs, which are contagious only to other people with CF or compromised immune systems.

The excellent news is CF is not at all contagious or dangerous to healthy people. The bad news is the cross-infection risks mean people with CF are advised not to be within 6 feet of one another.

In response, we’ve formed thriving online communities so that we can benefit from information sharing and support, but there’s no denying that virtual connections can never replace in-person ones. For me, this is one of the hardest things about CF.

2. CF and Tay Sachs are tied as fatal Jewish genetic diseases.

                   When you think of fatal Jewish genetic disease, you think “Tay Sachs,” right? But the truth is that approximately one in 25 to 27 Ashkenazi Jews is a carrier of CF, making it just as prevalent as Tay Sachs. That’s why Emily’s Entourage is on a mission to get the word out to the Jewish community that CF is their disease, too.

3. Our skin is super salty.

                          Back in the day, salty skin was the hallmark characteristic of CF. The reason is that a faulty salt chloride channel causes people with CF to excrete too much salt. In other words, when we sweat, we lose too much salt, which puts us at an increased risk of dehydration.

If it’s hot outside and you lick the skin of someone with CF (with permission, of course!), you’ll taste how salty they are! You may even see salt crystalize on their skin.

To this day, the diagnostic test for CF is called a “sweat test” because it measures the salt chloride levels in your sweat.

4. We are master deceptors.

                       CF is an invisible disease, which means that, as sick as our lungs and other organs are on the inside, you can’t tell from the outside. Just from looking at me, you’d probably never guess that I have less than a third of the average lung function or that I’m teetering on the brink of lung transplant evaluation.

This is a blessing and a curse. The downside is that it is often hard to appreciate how sick we feel and how difficult everyday tasks are because we look so deceivingly healthy on the outside. But on the flip side, it’s nice not to wear our disease on our sleeve, so to speak, so people see more than just our disease when they look at us. Plus, looking healthy rather than sickly is generally a good thing.

5. The nickname for CF is 65 roses.

                      Way back when children with CF had trouble pronouncing “Cystic Fibrosis.” So, they came up with a nickname with a similar ring: sixty-five roses. Roses certainly evoke a much lovely image than a life-threatening disease. In fact, the nickname stuck so much that it is still used today and roses have become an unofficial symbol of CF.

Answer:

Plants on land have taken up approximately 25 percent of the carbon dioxide that humans have put into the atmosphere. The amount of carbon that plants take up varies greatly from year to year, but in general, the world's plants have increased the amount of carbon dioxide they absorb since 1960

Explanation:

For example, in the food chain, plants move carbon from the atmosphere into the biosphere through photosynthesis. They use energy from the sun to chemically combine carbon dioxide with hydrogen and oxygen from water to create sugar molecules.

I just searched up Hope it helps!

Answer:

A. Viruses CANNOT be cured by

antibiotics

Explanation:

Answer:

a) Viruses cannot be cured by antibiotics.

Explanation:

"Viruses cannot be cured by antibiotics" is true about viruses. Because, the antibiotics can only cure bacterial diseases. Hence, the option (a) is the correct answer.

A cell knows when to divide when to duplicate its chromosomes, or when to enter another stage of the cell cycle by communicating with each other using chemical signals from special proteins called cyclins.

Cells control their division by exchanging chemical signals via unique proteins called cyclins with one another. These signals function as switches that inform cells when to begin dividing and then when to stop.

A cell has to go through a number of checkpoints in order to transition from one stage of its life cycle to the next. Specialized proteins inspect each checkpoint to see if the required circumstances are there. If so, the cell can move on to the following stage.

In order for each new cell to include all of the necessary genetic information, the genes must also produce copies of themselves prior to cell division.

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Answer:

element

Explanation:

An element is a substance that consists of only one type or kind of atom. An element is a pure substance as it cannot be broken down or transformed into a new substance even by using some physical or chemical means.

Answer:

d) Elements

Explanation:

An element is a substance that is pure and made of only one type of atom throughout. Hence, the option (d) is correct answer.

Digestion of fatty acids takes place in the peroxisome.