PRE
1.) the inability of red and purple
sea urchins to mate due to
gametic incompatibility
3.)different mating calls for two
different grasshopper species
POST
4.)the death of a zygote after
few weeks of formation
2.)a sterile zonkey formed from
the mating of a donkey and
a zebra
A bacterial population that has been growing for 15 generations began as a single cell. how many cells are present now?
Choose the correct answer.
Which phylum includes animals that lack tissues?
A. Cnidaria
B. Porifera
C. Platyhelminthes
D. Arthropoda
E. Chordata
Answer is B. Porifera
Members of the phylum porifera includes animals which lack tissues. These animals are also called sponges. These are the simplest multicellular animals. Even though they are multicellular, they do not have any tissues or organs. They have cellular level of body organization. Sponges are aquatic animals and water plays a major role in the feeding, exchange of gases and as well as excretion.
Final answer:
Phylum Porifera, which includes sponges, is the group of animals that lack true tissues, classifying them as parazoans.
Explanation:
The phylum that includes animals which lack true tissues is Porifera. Members of phylum Porifera, commonly known as sponges, are parazoans and do not possess true tissues. They display a simple organization and have multiple specialized cell types, but these do not form the complex tissues seen in more advanced organisms, like eumetazoans. Unlike the sponges in phylum Porifera, eumetazoans, such as those in the phylum Cnidaria, have true tissues, including outer and inner tissue layers. This structure enables more complex functions and body plans. Hence, the correct answer to the question of which phylum includes animals that lack tissues is B. Porifera.
In which habitat is one likely to find plants that have developed extremely large, broadleaf, evergreen leaves for gathering light, epiphytes, and climbing vines that strangle other plants?
a.taiga
b.kelp forest
c.tropical rainforest
d.temperate deciduous forest
Answer:
C. tropical rainforest
Explanation:
Because of the very dense canopy in the rainforest, little sunlight reaches the ground. For this reason most rainforest tree leaves are large and dark green, which aid them in capturing more sunlight for the photosynthesis process. Some trees will grow large leaves at the lower canopy level and small leaves in the upper canopy. These are strategies to reach sunlight in a leafy ecosystem where the light input is low.
The climbing vines apply this strategy of growing to maximize the sunlight they receive. Many start life in the canopy before sending roots down to the ground.
The Epiphytes live on the surface of other plants to make the most of the sunlight in the canopy layer.
Answer:
tropical rainforest
Explanation:
The branch of the autonomic nervous system that slows down the body as it recovers from exposure to a stressor is the _______________ nervous system
Answer:
Parasympathetic
Explanation:
Fungi are both beneficial and destructive. this fungus is living in and on the tree seen here. this is a ____________ relationship and could cause the tree to ______________.
a.helpful; grow
b.parasitic; die
c.helpful; make fruit
d.symbiotic; reproduce
The process of using the information in mrna to synthesize protein is ___
The process of using the information in mRNA to synthesize a protein is known as Translation. It involves the decoding of the mRNA's codon sequence at the ribosomes to construct a protein from amino acids. The tRNA molecules bring the amino acids to the ribosomes.
Explanation:The process of using the information in mRNA to synthesize protein is called Translation. This is a fundamental step carried out at the ribosomes in cells during protein biosynthesis. The mRNA's role is to serve as a template for the assembly of amino acids into a protein structure. Each triplet on the mRNA, called a codon, correlates with a specific amino acid. The tRNA molecules transport the correct amino acids to the ribosomes based on the codon sequence. The ribosomes perform the complex task of binding to the mRNA and accurately matching each codon with its appropriate amino acid, forming the final protein product.
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Erin is keeping a science journal. She wrote the following paragraph that explains how light travels through different mediums. But she’s made one mistake. Which sentence in Erin’s journal is incorrect? A ray of light passes through the air and enters the water inside a metal container. The light ray bends as it crosses the boundary between air and water. Once it hits the bottom of the container, the ray gets reflected. The reflected ray passes back through the water and enters the air without bending. In this example, the ray of light is both reflected and refracted.
The incorrect sentence in Erin's journal would be that the reflected ray passes back through the water and enters the air without bending.
How does light travel through different media?Light rays travel from medium A to medium B and get refracted depending on the density of the 2 media.
Thus, when a light ray travels from air to water, it gets refracted at a particular angle and when the reflected ray travels back from the water to air, it also gets refracted at the same angle.
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The incorrect sentence in Erin's journal is: 'The reflected ray passes back through the water and enters the air without bending.'
Erin's journal contains a mistake related to the behavior of light when it travels between different mediums. Specifically, the incorrect sentence is:
'The reflected ray passes back through the water and enters the air without bending.'
Light rays refract (bend) when they transition from one medium to another, such as from water back into air, due to the change in speed as they move from a denser to a less dense medium. Therefore, the reflected ray should also bend when it moves from water to air.
Here is the corrected version of the paragraph:
A ray of light passes through the air and enters the water inside a metal container.The light ray bends as it crosses the boundary between air and water.Once it hits the bottom of the container, the ray gets reflected.The reflected ray passes back through the water and bends as it enters the air again.In this example, the ray of light is both reflected and refracted.This explanation aligns with the principles of refraction and reflection in physics.
To promote shell formation in eggs ,what can be added to the diet of layers?
To promote shell formation calcium should be added more often the diet of layers. Calcium is an important mineral for egg shell quality. It is the main component of the egg shell which consists of 95% of calcium carbonate. Deficiency of calcium in the diet of layers may lead to the reduction in eggs size and also the production, poor egg quality with high chances of breakage and also an increased layer mortality.
Which part of the brain is most involved in control proceeses such as impulse control, emtion control, and long term planning?
Describe the process of the mitotic spindle and microtubules throughout the steps of mitosis.
Microtubules form the mitotic spindle during Prophase, align the chromatids in Metaphase, pull them apart in Anaphase, and disappear during Telophase. They play a crucial role in chromatid separation.
Explanation:The mitotic spindle, composed of microtubules, plays a critical role in the stages of mitosis. In Prophase, the mitotic spindle begins to form, extending from the centrosomes which move to opposite ends of the cell. The microtubules also break down. In Metaphase, the spindle fibers from each centrosome connect to a kinetochore on each sister chromatid, aligning them along the middle of the cell. The microtubules then start to contract.
In Anaphase, the spindle fibers contract further, pulling the sister chromatids apart to opposite poles of the cell. Then, in Telophase, the spindle fibers disappear, and the cell begins to split in a process known as cytokinesis.
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This is the science of genes, heredity and variation of organisms.
Answer:
It's genetics
Explanation:
Charles Darwin studied finches on the Galapagos Islands. While the finches on all the islands came from the same ancestors, the distance between the islands was too great to allow finches from different islands to interbreed. Over time, the size of the finches on the different islands remained the same, but the shape and size of their beaks changed, as shown here. This adaptation helped the finches find food on their particular island. The change in the size and shape of the finches’ beaks was MOST LIKELY caused by A) geographic isolation B) a change in climate. C) endangerment of the species. D) a decrease in the mutation rate. 9)
The answer Is A (hope this helps)
Does the order of amino acids in a protein matter
Yes, the order of amino acids in a protein is crucial and significantly affects its structure, function, and stability.
Does the order of amino acids in a protein matterProteins are polymers composed of a specific sequence of amino acids linked together by peptide bonds. This sequence is encoded by the genetic information in DNA.
The linear arrangement of amino acids determines how the protein folds into its three-dimensional structure. The folding of a protein is driven by various interactions between the amino acid side chains, including hydrogen bonding, hydrophobic interactions, electrostatic interactions, and disulfide bonds. These interactions occur between different amino acids in the sequence, and they dictate the specific folding pattern adopted by the protein.
The three-dimensional structure of a protein is intimately linked to its function.
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Why does the cell membrane of the tube worm atop the flow of excess salt into it's body?
Oswald avery showed that
a. cells missing protein and rna were able to transform r cells into s cells and kill mice, but cells missing dna could not.
b. cells missing dna were able to transform r cells into s cells and kill mice, but cells missing protein and rna could not. selected:
c. cells missing dna, protein, and rna were able to transform r cells into s cells and kill mice.this answer is incorrect.
d. cells missing dna, protein, and rna were not able to transform r cells into s cells and kill mice. 1/1 question 16
Which families of metals are not so reactive, which allows them to exist by themselves in nature?
The answers are:1. Noble Gases,
2. The closer the element is to the noble gases the less reactive it is.Hope this helps !!! :)
Rosemary had a stroke about a year ago and now she cannot understand what people are saying to her. this is embarrassing for her, so she responds using vague language and tries to make it appear as though she understands. which area of rosemary's brain was likely damaged by the stroke?
The area of Rosemary’s brain that was likely damaged by the stroke is the Wernicke’s area. This is the region of the brain that is important as they are responsible for language development in which this might have been the reason as to why Rosemary doesn't understand what are the people around her telling her.
When a predator eats its prey, all the energy from the prey is transferred into the biomass of the predator
A) true
B) false
Answer is B) false.
According to 10 % law of energy transfer, when a predator such as hawk eats its prey such as snake in a grassland ecosystem , only 10 % of the available energy of the prey (snake) is transferred into the biomass of the predator (hawk). Most of the remaining energy is lost as heat to the environment.
If you hold a light tissue in your hands and gently blow across its top, the tissue will rise slightly because
Describe how a sunshine recorder works
Answer:
A sunshine recorder is a device that records the amount of sunshine in a given area. This helps to determine information about weather and climate as well as the temperature of a geographical area.
Explanation:
copy and paste this ^^^^
100%
which statement describes what most likely occurs when I Compass is placed next to a simple circuit made from Battery, a light bulb, and a wire
Coordination by the nervous and endocrine systems results in
During which checkpoint do cell proteins determine whether growth factors that stimulate cells to divide are present
An electrocardiogram is prescribed for a client complaining of chest pain. the nurse recognizes which as an early finding of an infarcted area of the heart?
Which blood pressure readings for an adult would prompt a diagnosis of hypertension? a. 110/70 b. 140/96 c. 119/79 d. 130/79?
Which organism is not included in domain archaea
a. cyanobacteria
b. methanogens?
Cyanobacteria is not included in domain archaea.
What are the characteristics of cyanobacteria?Cyanobacteria are phylum of gram-negative bacteria that obtain energy via photosynthesis. The name cyanobacteria refers to their color, which similarly forms the basis of cyanobacteria's common name, blue-green algae.
Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance. Toxins from cyanobacteria can make animals very sick or even kill them.
Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance.
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The outdated term for infant-directed speech is __________.
The outdated term for infant-directed speech is motherese. Motherese refers to the simplified and exaggerated speech patterns that adults adopt when talking to infants and young children.
Explanation:The outdated term for infant-directed speech is motherese. Motherese refers to the simplified and exaggerated speech patterns that adults adopt when talking to infants and young children. It is characterized by a higher pitch, slower tempo, exaggerated intonation, and a simplified vocabulary.
Motherese is believed to serve an important role in language development by capturing the attention of infants and helping them differentiate speech sounds. It also facilitates bonding and social interaction between parents and infants.
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The outdated term for infant-directed speech is motherese, which involves simplified speech patterns and exaggerated intonation to help babies develop language and communication skills.
Explanation:The outdated term for infant-directed speech is motherese. This kind of language involves simplified speech patterns, exaggerated intonation, and repetition. These elements help babies develop their language and communication skills. For instance, infants can recognize their mother's voice and discern between familiar languages and foreign ones. They also show preferences for faces that align with the sound of spoken language.
Essentially, motherese aids in the early stages of language acquisition, from cooing to babbling and eventually to the formation of first words.
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The first genetic material on earth was probably ________. the first genetic material on earth was probably ________. dna produced by reverse transcriptase from abiotically produced rna dna molecules whose information was transcribed to rna and later translated in polypeptides self-replicating rna molecules oligopeptides located within protocells
The first genetic material on Earth was likely self-replicating RNA molecules, as postulated by the RNA World Hypothesis. The transition from RNA to DNA likely involved a primitive reverse transcriptase.
Explanation:The first genetic material on Earth was likely self-replicating RNA molecules. This idea forms the base of the RNA World Hypothesis, which suggests these molecules could have been the first carriers of genetic information. Unlike DNA, RNA can act both as a genetic material and as a biocatalyst due to its ability to adopt complex tertiary structures that can perform biological activities, similar to proteins.
It is believed that the transition from RNA to DNA could have been facilitated by the evolution of a primitive reverse transcriptase, converting the RNA information into more stable DNA.
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The first genetic material on Earth was most likely self-replicating RNA molecules, as proposed by the RNA world hypothesis. Over time, the more stable DNA started to replace RNA for the storage of genetic information, possibly through the action of early reverse transcriptases.
Explanation:The first genetic material on Earth was probably self-replicating RNA molecules. This idea stems from the RNA world hypothesis that proposes that RNA molecules could have been the first form of genetic material, prior to the evolution of DNA and proteins. This is because RNA, unlike DNA, has the dual functionality to both store genetic information and catalyze chemical reactions as enzymes do.
The experiments of Martha Chase and Alfred Hershey in 1952 provided proof that DNA was indeed the genetic material and not proteins. However, this does not contradict the RNA world hypothesis as it is believed that the more stable DNA eventually took over the role of genetic information storage from RNA.
One theory for the origin of DNA involves the role of retroviral reverse transcriptase. This enzyme converts RNA into DNA - a process known as reverse transcription. Therefore, it is proposed that DNA could have evolved from an RNA world through the action of these early reverse transcriptases.
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Which of the following is an example of instrumental aggression?
A. cutting off another driver in heavy traffic
B. holding up a bank (bank robbery)
C. shoving another person during an argument
D. performing a headlock on an attacker
The right option is B.
holding up a bank (bank robbery)
Instrumental aggression is a form of aggression which is carried out as a
means of securing some reward or to achieve a specific goal. Holding up a bank
(bank robbery) is an example of instrumental aggression because it is done for a
specific goal which is to obtain
money, assets or other property owned or held by the bank.
Answer: Option B
Explanation:
Instrumental aggression can be defined as showing an aggression for achieving goals. It is made o achieve some reward or to achieve an external goal such as victory.
In case of bank robbery the people will achieve money( reward) which acts as a signal of victory for the robbers.
So, bank robbing is an example of instrumental aggression.
What organelle is labeled M?