Answer:
it is choice a.............................
Explanation:
on test
Answer:
A
Explanation:
What is the molecular weight of 1 mole of NaCl where the atomic mass of Na = 23 and Cl = 35.4?
*
4. What are the only prokaryotes?
Answer:
Bacteria is the only prokaryotes.
Some cynobacteria are also included in prokaryotes.
Describe the path of a signal from a neuron's dendrite to a second neuron's dendrite.
Answer:
Dendrite are short hair like structures originating the periphery of the cytoplasm. Dendrites are either in close contact with other neurons or the stimulus receptor cells.
I would attach a diagram with this note I hope it helps.
the disease erythroblastosis fetalis (also called hemolytic disease of the newborn) develops in a fetus or a newborn infant with Rh-positive blood and an Rh-negative mother. Symptoms results when maternal anti-Rh antibodies cross the placenta and interact with the fetus' erythrocytes. Why are the children of Rh-positive mothers not ay risk for this disease
Answer:
Explanation:
Hemolytic Disease of the newborn (HDN, Erythroblastosis Fetalis) is a blood disorder occurring at or around birth, where the blood groups of the mother and baby are not compatible. It occurs when the antibodies from a Rhesus negative (Rh-negative) mother, who has been sensitized from previous pregnancies or other means (transfusion etc), gives birth to an Rh-positive baby, and the blood of the mother and the baby eventually mixes. This causes the anti-Rhesus antibodies in the mother's blood to attack the Rhesus antigen (Also Called Anti-D antigen) on the baby's red blood cells, causing hemolysis that leads to several unpleasant symptoms.
Children of Rh-positive mothers are not at risk of developing HDN, because the mother does not produce anti-Rh antibodies since she is positive, hence there will be no antibodies to cross the placenta and react with the baby's rhesus antigens for Rh-positive babies.
If plants in a population seriously decreased, how would the animals in that population be affected? EXPLAIN
Answer:
because a lot of animals eat plants, so a lot of animals will die off/ or move to a place with lots of plants.
Explanation:
most animals live off eating plants.
What did Adam say when he saw Eve
The man said, “This is now bone of my bones, and flesh of my flesh; she shall be called woman, because she was taken out of man.”
What is in the center of every atom?
Answer:
The Nucleus, comprised of Protons and Neutrons.
The outer structure of the neuron is made of a
a semipermeable membrane
1. A bacteria cell that divides to create two exact copies of itself is an
example of
A. sexual reproduction
B. homeostasis
c. asexual reproduction
D. DNA replication
Answer:
Asexual Reproduction
Explanation:
As the bacteria cell is dividing on its own to create more bacteria, it is performing asexual reproduction as it is not reproducing with a secondary bacteria cell.
Asexual reproduction is the process by which a bacteria cell that divides to create two exact copies of itself. Thus option C is correct.
What is bacterial cell division ?Bacteria reproduce by the process of asexual reproduction which is mainly binary fission, where the offspring produced from parent are similar.
In this process parent cell is undergo division and separated into two new daughter cells. Each daughter cell get one copy of its parent DNA.
No spindle apparatus formation occur in binary Fission. In this process, the DNA molecule undergo replication and attaches each copy to various parts of the cell membrane
For example, Prokaryotes like E. coli, Archaea and some eukaryotes like euglena reproduce through binary fission.
The advantage of binary fission is very fast and it requires single organism or parent.
Thus option C is correct.
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Is this statement true or false? The period before we have written records is called prehistory. true o false
Answer:true
Explanation:
what are 3 ways your skin protects you
Answer:
The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold.
Which molecule has the lowest potential chemical energy?
Answer:
i have the same question too?
Explanation:
Chemical potential energy is defined as the energy present or stored in the chemical bonds of a substance. The decreasing order of the molecules with chemical potential energy is solid, liquid, and gas.
The correct answer is:
Option B. Carbon dioxide
The chemical potential energy can be explained as:
1. ATP and NADH are the energy currency of the cells, such that these molecules yield energy when the bonds are broken down.
2. Glucose is a solid compound that will have a high chemical potential energy as compared to carbon dioxide.
3. Carbon dioxide is a gaseous compound that will have the least chemical potential energy as compared to ATP, NADH, and glucose.
Thus, carbon dioxide will have the least potential chemical energy.
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atmosphere is a mixture of two things
Answer: yes
Explanation:
It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Which of the following orders of animals are vegetarians?
a. Proboscidea
b. Artiodactyla
c. Lagomorpha
d. All of the above
Answer: Option D.
All of the above.
Explanation:
Proboscidea , Artiodactyla , Lagomorpha are all vegetarians and vegetarians are animals that feed on plants i.e grasses, shrubs e.t.c.
These order of animals are refered to herbivorous animals i.e animals that feed on plants and they have two pairs of growing incisors,molars and premolars.
Members of lagomorphs are rodents, hares, rabbit, pikas e.t.c.
Artiodactyla members are cattles, camels, pigs e.t.c. These order have tusks for defending themselves.
Proboscidea include elephants.
What is the composition of hair?
Answer:
The hair is made up of 95% keratin, a fibrous, helicoidal protein (shaped like a helix) that forms part of the skin and all its appendages (body hair, nails, etc.). Keratin is synthesized by keratinocytes and is insoluble in water, thus ensuring impermeability and protection for the hair.
Explanation:
why insect mouth part is important for insect pest control?
Answer:
Insects with rasping/sucking mouthparts actually rasps or scrapes the surface of plant tissue (such as leaves or petals) and sucks up the fluids that ooze from the damaged area of tissue. Examples of pests with rasping-sucking mouthparts include thrips and mites. Thrips prefer to feed on succulent plant tissues.
Explanation:
I hope it helped
Lysosomes contain enzymes that are necessary for what?
Answer:
They break down all types of biological polymers—proteins, nucleic acids, carbohydrates, and lipids.
Explanation:
Answer:
breaking down of food
Explanation:
Lysosomes are membrane-enclosed organelles that contain an array of enzymes capable of breaking down all types of biological polymers—proteins, nucleic acids, carbohydrates, and lipids.
HELP PLEASE :,,,,,,,|
Answer:
i think it is B
Explanation:
i hope it help
1. Which of the following things is common to all living organisms? it for a test so I need it quick!
Answer:
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
How many trophic levels are there in the following food chain?
Grass - Grasshopper - Frog - Snake
Answer: Four
Fun Fact - Locusts are actually species of short-horned grasshoppers, they often gather in large swarms and can destroy entire fields of crops, because a single grasshopper can eat half its body weight in plants per day.
There are four trophic levels in the given food chain, i.e., producer, primary consumer, secondary consumer, and tertiary consumer.
What is a food chain?A food chain is a network of connections in a food web that begins with producer organisms and ends with a predator, detritivore, or decomposer species.
In the given food chain, grass is produces, grasshopper is primary consumer, frog is secondary consumer, while snake is tertiary consumer.
Thus, there are four trophic levels in the given food chain.
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What is the Density of an object with a mass of 20 grams and a
volume of 10 cmº?
What types of cells contain a cell
wall?
Answer:
Plant cell
Explanation:
Cell wall only in plant cells
Which of the following is a nucleotide found in DNA?
Answer: The four nitrogenous bases in DNA are guanine, adenine, cytosine and thymine; in RNA, uracil is used in place of thymine.
Explanation:
Hopefully this helps you.
The part of the gene that is designated as 1 is also known as:________.
Answer:
Immune or sensory genes.
Explanation:
The part of genes designated as part 1 Gene is refer to immune or sensory genes because these part of gene play a vital role in immune response or sensory signals of the cell.
The part of genes have the same Expression level and different copy number variable region.
A student who studies the sizes of groups of birds records
data for this group of ducks.
Which two terms describe the relationship between the two variables in this graph
A:negative
B:strong
C:weak
D:positive
Negative and strong apex
Answer:
c
Explanation:
The total magnification of a specimen viewed under a compound light microscope is determined by the power of the objective lens added to the power of the ocular lens the magnification power of the ocular lenses used the power of the objective lens multiplied by the power of the ocular lens the magnification power of the objective lenses used
Answer:
The power of the objective lens multiplied by the power of the ocular lens
Explanation:
Answer:
c. The power of the objective lens multiplied by the power of the ocular lens
Explanation:
Which of these organisms does NOT produce an enterotoxin?
a. Shigella spp.
b. Clostridium botulinum.
c. Vibrio cholerae.
d. Staphylococcus aureus.
Answer:
b. Clostridium botulinum.
Explanation:
The enterotoxins (also know as exotoxins when they are produced by bacteria) are polypeptides secreted by microorganisms that target the intestine. These toxins may produce serious damage to the host by disrupting the function of the epithelial intestinal cells Moreover, Clostridium botulinum is a Gram-positive bacterium that is able to produce a potent neurotoxin (botulinum) which is known to cause severe flaccid paralytic deformities in humans.
The organism that does NOT produce an enterotoxin among the options given is b) Clostridium botulinum. Clostridium botulinum is a bacterium known for producing botulinum toxin, which is a neurotoxin rather than an enterotoxin. It does not, however, create an enterotoxin.
The severe sickness known as botulism is brought on by the botulinum toxin, which predominantly affects the nervous system.
Although enterotoxins can induce diarrheal disorders and are linked to gastrointestinal symptoms, an organism need not produce an enterotoxin to be pathogenic. The host's sensitivity to infection and the infectious dosage are other important variables.
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Explain the need for a reference point when describing the direction of motion
Answer:
It is important as it tells if the object is stationary or in motion
Explanation:
The element phosporus is located to the right of the element magnesium along the same period in the periodic table.
Which best describes the relationship of the elements ?
A. Magnesium has a larger atomic number
Answer: B. Phosphorus has a larger atomic mass.
C. Magnesium is in the same category as phosphorus
D. Phosphorus has similar chemical properties as magnesium
Answer:
b
Explanation:
The relationship which describes the best of the element"B. Phosphorus has a larger atomic mass."The correct option is B.
Atomic mass:
Atomic mass refers to the combined mass of protons, neutrons, and electrons in an atom.
The periodic table arranges elements in order of increasing atomic number, which corresponds to the number of protons in an atom's nucleus.
Elements in the same period (horizontal row) have the same number of electron shells, while elements in the same group or column have similar chemical properties.Phosphorus is located to the right of magnesium along the same period, indicating that it has a larger atomic number (more protons) than magnesium.Phosphorus has a larger atomic mass, while magnesium has a smaller atomic mass compared to phosphorus.Therefore, the correct option is B.
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Under which circumstance does Mendel’s principle of independent assortment hold? a. only when there is crossing over b. only when traits are tightly linked (close together) on the same chromosome c. only when traits are on different chromosomes d. only when the traits are not influenced by selection
Answer:
c
Explanation:
Mendel's principle of independent assortment holds only when traits are on different chromosomes.
The independent assortment principle states that genes assort independently of one another. In order words, traits are independently inherited by offspring from parents. For example, the trait for eye color is independently inherited from skin color, height is independently inherited from feet size, and etc.
This principle only holds true when genes are located far away from one another on the same chromosome or when they are on different chromosomes entirely. Once genes are close to one another on the same chromosome, they become linked together and no longer independently inherited.
The correct option is c.