What is a macromolecule? Question 6 options: a) a molecule that contains carbon b) a very large molecule c) a molecule that has two hydrogen atoms and one oxygen atom d) a molecule you can see with the naked eye

Answer:

2.25 billion

Explanation:

option C is correct

Answer:

can cause large changes in enzymatic activity

Explanation:

An enzyme refers to a biological catalyst that is typically used to speed up (accelerate) the rate of a chemical reaction by lowering the activation energy of its reactants.

An allosteric effector can be defined as an agent, organ or molecule that is being binded to an enzyme at a site, thereby causing a reduction (negative effect) or an increase (positive effect) in an enzyme activity.

When the activation energy of a reaction is low, the rate of the reaction would be faster. Therefore, an enzyme speeds or catalyzes the rate of a reaction by lowering its activation energy.

Additionally, if the conditions are not optimal for an enzyme, it limits the ability of an enzyme to bind or be joined with its substrates.

Furthermore, an increase in temperature increases or speeds up the rate of a reaction while low temperature limits or reduces the rate of a reaction.

In the human body, the optimal temperature for enzymes is around 37 degrees celsius (°C).

In conclusion, an allosteric effector can cause large changes in enzymatic activity because it acts as an intermediary and mediates specific effect in a metabolic pathway.

Answer:

Angiotensin II is a main effector of RAS and is produced due to the release of the renin that forms in the kidney, angiotensin in turn stimulates the release of aldosterone from the adrenal cortex.

Angiotensin II serves various roles other than vasoconstriction to maintain blood pressure that are:

1. Autoregulation of GFR

2. Reduction of salt excretion through direct and indirect actions on renal tubular cells,

3. Growth modulation of renal cells - these express AT1 receptors.

Answer:

Northern Hemisphere

The Northern Hemisphere receives the direct sun rays while the angle of sunlight decreases in the Southern Hemisphere.

ANSWER:

Lesions are areas of damage to motor neurons. Damage to upper motor neurons stops the signals your muscles need to move. When your muscles don't move for a long time, they become weak and stiff. Over time, it can become harder to walk and control your movement.

Explanation:

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Answer and Explanation:

The function of neurons is to transmit nerve impulses. The transmission depends on the unequal distribution of ions in the interior and the exterior of the cell.

The cell interior has many negative ions –anions- and k+ ions that cannot get out of the cell, while the extracellular space has many Na+ and Cl- ions.  

The charge difference between the interior and the cell exterior is named resting potential difference, representing a non-exited state.  

When the neuron is stimulated, many changes in channel proteins occur that let the ions move through the membrane altering the resting-potential difference.

The central nervous system generates an action potential that travels to the target activating the calcium channels. Calcium triggers vesicles fusion to the presynaptic membrane releasing a neurotransmitter into the synaptic space. Once there, the molecule binds to its receptors on the postsynaptic membrane, causing ion channels to open. The activation of different receptors will cause a change in the postsynaptic membrane modifying the cell activity.  

Two types of receptors can be found the in te postsynaptic membrane:

Depending on the ion flow through the membrane channel receptors, the postsynaptic potential may be depolarizing - excitatory postsynaptic potential, EPP-, or hyperpolarizing - inhibitory postsynaptic potential, IPP-. For instance, the entrance of Na+ ion depolarizes de cell. But if K+ gets out of the cell, it produces hyperpolarization.  

Depolarizations or hyperpolarizations can be taken to other regions of the cell. The depolarizing or hyperpolarizing effect will gradually fade as it increases the distance from the potential change origin.  

Under physiological conditions, when the axon is stimulated occurs a depolarization. If the stimulus exceeds a threshold level, many sodium gates open simultaneously, and the action potential occurs, responsible for the nerve impulse transmission. Once Na+ channels get closed, K+ channels open. Ions traffic consists of the pass of sodium to the interior of the cell and potassium to the exterior. K+ follows a concentration gradient, while Na+ follows an electrochemical gradient.  

When the electrical stimulus is applied to the membrane of the axon it produces depolarization by activating the sodium voltage-dependent channels all along the axon. Depolarization propagates to inactivated regions adjacent to the membrane opening more sodium channels.  

There is a directly proportional relationship between the fiber diameter and the conduction velocity. The greater the diameter is, the faster the conduction is. Most axons contain a myelin sheath formed by the envelopment of the axon by glial cells. Myelin is fatty and isolates the axon, so in myelinic regions, there is no ion exchange. So to conduct the impulse, there must be regions without myelin. These regions are the Ranvier nodes, which have channels for ion interchange.  

The conduction speed increases in myelinated fibers because of the high concentrations of sodium channels in the Ranvier nodes. Mielinized fibers are thick, and their conduction velocities are very fast.

Answer:

bicarbonate ions; urine alkalinization; carbonic anhydrase inhibitors increase urine volume (diuretics drugs)

Explanation:

Carbonic anhydrase inhibitors are diuretic drugs that have been primarily used to treat glaucoma, a condition where the optic nerve is progressively damaged due to an increased pressure in the eye. Carbonic anhydrase inhibitors reduce the production of aqueous humor in the eyes by decreasing bicarbonate (HCO3-) production, thereby also reducing the intraocular pressure, which is useful to treat glaucoma. Diuretics are drugs that are able to increase the volume of urine by stimulating the excretion of salts and water from the kidneys. In the kidneys, carbonic anhydrase inhibitors inhibit HCO3- uptake by the proximal tubule, leading to urine alkalinization.

Answer:

Matution include changes as small as the substitution of a single DNA building block, nucleotide base, with another nucleotide base.... Other matutions result in abnormal protein product.

Answer:

option B

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b

b

B

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b

b

b

Answer:

Vertebrates are animals that have a backbone inside their body

Explanation:

Answer:

Vertebrates are organisms that have a backbone.

Explanation:

I hope this helps.

Answer:

is that the one i answered already...

Explanation:

Answer:

Gametes

Explanation:

Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.

hi temperature above 40 will kill the chick and low one will also result to death

Nucleic acids, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), carry genetic information which is read in cells to make the RNA and proteins by which living things function. The well-known structure of the DNA double helix allows this information to be copied and passed on to the next generation.

Answer:

C

Explanation:

Photosynthesis occurs in chloroplasts

Answer: The answer is  C

Explanation: Photosynthesis occurs in the chloroplasts

because in the chloroplast the chlorophyll presents allow the energy in sunlight to drive chemical reactions. Chloroplasts act as energy transducers converting light energy into chemical energy.

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Answer:

In biology, a gene is a basic unit of heredity and a sequence of nucleotides in DNA or RNA that encodes the synthesis of a gene product, either RNA or protein. During gene expression, the DNA is first copied into RNA.

Euchromatin is a lightly packed form of chromatin that is enriched in genes, and is often under active transcription. Euchromatin comprises the most active portion of the genome within the cell nucleus. 92% of the human genome is euchromatic.

The genes present in heterochromatin are usually inactive. The genes present in euchromatin are either already active or will be active during growth. Heterochromatin is transcriptionally-inactive. Euchromatin is transcriptionally. (This one here is the difference)

Answer: C. solar energy is most available in the southwestern part of thw united states

Explanation: Please mark brainliest if correct - I need one more to get to the next level thanks

Explanation:

The Mohs scale of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material.

TLDR: harder minerals will scratch softer minerals

Answer:

Two samezygous black(FF)

Answer:The three organisms that belong in the same phylum as your Protist are:1. Algae: Algae are plant-like Protist and are all photosynthetic Protists. 2. Protozoa: Protozoa are animal-like

3:heterotrophes are like fungi protists

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Answer:

Mitosis is a type of cell division that results in two daughter cells each having the same kind of chromosomes as the parent cell..it mostly occurs in eukaryotic cells.

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Answer:

Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Explanation:

Now this is a lot of bio to cover, but, there are 5 stages of mitosis.

1) Interphase:

The DNA in the cell is copied in preparation for cell division, this results in two identical full sets of chromosomes?

Outside of the nucleus? are two centrosomes, each containing a pair of centrioles, these structures are critical for the process of cell division.

During interphase, microtubules extend from these centrosomes.

2. Prophase:  

The chromosomes condense into X-shaped structures that can be easily seen under a microscope.

Each chromosome is composed of two sister chromatids, containing identical genetic information. This is very important.  

The chromosomes pair up so that both copies of chromosome 1 are together, both copies of chromosome 2 are together, and so on.

At the end of prophase the membrane around the nucleus in the cell dissolves away releasing the chromosomes.

The mitotic spindle, consisting of the microtubules and other proteins, extends across the cell between the centrioles as they move to opposite poles of the cell.

3. Metaphase:

The chromosomes line up neatly end-to-end along the Centre (equator) of the cell.

The centrioles are now at opposite poles of the cell with the mitotic spindle fibers extending from them.

The mitotic spindle fibers attach to each of the sister chromatids.

4. Anaphase:

The sister chromatids are then pulled apart by the mitotic spindle which pulls one chromatid to one pole and the other chromatid to the opposite pole.

5. Telophase:

At each pole of the cell a full set of chromosomes gather together.

A membrane forms around each set of chromosomes to create two new nuclei.

The single cell then pinches in the middle to form two separate daughter cells each containing a full set of chromosomes within a nucleus. This process is known as cytokinesis.

The answer is 50%, or B.

Answer:

The order is astronomy, geology, and the last one is environmental science.

Explanation:

Astronomy is the study of space, Geology is the study of Earth's surface and environmental science is the study of interactions between living organisms and nonliving things.

Geology is also called geoscience. The study of the structure and evolution of the earth and all its resources including natural resources and mineral resources is called geology. All the processes that are happening on earth's surface and those that have shaped it into the current form are studied under geology.

The study of the objects and processes in space outside of the earth's atmosphere is called astronomy. It includes the study of stars, galaxies, black holes, etc.

The interdisciplinary field of biology including the subjects like physics, chemistry, ecology, and geology to study interactions between living organisms and nonliving things is called environmental science.

Therefore, astronomy is the study of space, Geology is the study of Earth's surface and environmental science is the study of environmental processes.

Read more about environmental science, here

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