Answer:
Choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares.
Explanation:
Sarcopterygii also known as lobe-finned fishes which usually possess a choana, paired fins with a fleshy base over a bony skeleton, persisting notochord, 2 dorsal fins and nares are present internally. The lungfishes are considered the closest living relatives of tetrapods because of the presence of some common features. The African lungfish has epithelial crypts located at the base of the lamellae of the olfactory epithelium that express markers of the vomeronasal receptors in tetrapods.
What is an example of a direct effect that would result from an increase in deer mouse in this food web
Answer: increase in predator population.
Explanation: mouse deer are prey for some animals like tigers. So if their population increased, the tiger's also will or the predators'. Then it will immediately be followed by a decrease in both the prey and the predator's population.
An experimental herbicide kills plants by blocking the ATP synthase in thylakoids. This is most likely to: Group of answer choices Decrease the pumping of NADPH across the thylakoid membrane Increase the pH of the chloroplast stroma Decrease of flow of electrons from photosystem II to photosystem I Decrease the concentration of ATP in the thylakoid space
Answer:
Decrease the pumping of NADPH across the thylakoid membrane
Decrease of flow of electrons from photosystem II to photosystem I
Explanation:
Thylakoids are defined as a membrane-bound compartments located inside the chloroplasts and the cyanobacteria. Here, light-dependent reactions of photosynthesis occurs.
To block the photosynthesis process, the herbicides pushes the dichlorophenyl dimethylurea to block the electron flow through the photosynthesis II and it reduces the flow of electrons from photosystem II to photosystem I. It also decreases pumping of the NADPH across the thylakoid membrane.
What happens if a cell goes through metastasis?
Answer:
In metastasis, cancer cells break away from where they first formed (primary cancer), travel through the blood or lymph system, and form new tumors (metastatic tumors) in other parts of the body. The metastatic tumor is the same type of cancer as the primary tumor.
Which event occurs in telophase II
Explanation:
During telophase II and cytokinesis, chromosomes arrive at opposite poles and begin to decondense; the two cells divide into four unique haploid cells.
An ecosystem experiences a loss of denitrifying prokaryotes. Will this loss affect the health of the ecosystem?
yes it will, it will ruin the food chain
Sometimes the most practical way to do an experiment is not to perform it in an animal, but to look at cell responses in culture. Cells from mice, humans, and other mammals have been used to establish cell culture lines that have been very important for research. You are studying a novel water-soluble mouse hormone. You know cell culture can be a practical model to reveal protein function, so you apply the hormone to yeast cells, but nothing happens. What is a likely explanation for why nothing happened in your experiment
Answer:
Yeast cells likely do not have receptors that bind to this specific water-soluble mouse hormone
Explanation:
Receptors are molecules capable of binding specific signaling molecules (i.e., ligands). For example, steroid receptors can only bind to specific steroid hormones (e.g. estrogen, progesterone). Plasma membrane receptors are protein receptors that bind to water-soluble ligands. These receptors are embedded in the cell plasma membrane and usually contain several transmembrane domains. Examples of cell membrane receptors include G protein-coupled receptors (GPCRs), enzyme-linked protein receptors and ion channel receptors.
50 POINTS!!! The forces of nature are all around us working to shape the surface of our planet. Your task is to search the globe for three examples of land formations shaped by surface events. You will create a presentation to demonstrate your knowledge on this topic. You may choose to create a travel brochure, a vacation scrapbook, or a presentation using software.
Be sure to include the following for each land formation you choose:
a picture (you may hand draw, take photos in nature, or use stock images)
a complete explan
Answer:
Four major landforms are
A) Mountains B) hills C) plains D) plateaus
Explanation:
I hope this helps you out a little!
How many hydrogen atoms are there in the molecule H2S04?
O A. 1
B. 3
C. 4.
O D. 2
Answer:
two hydrogen atom
Explanation:
Sulfuric Acid, H2SO4 is a chemical compound made up of two hydrogen atom, one sulfer atom, and four oxygen atoms.
Is the Use of energy to move particles against the concentration gradient
Answer:
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
how has technology changed farming
a- there are fewer farms than there used to be
b- farmers use mechanical devices to do my tasks.
c-farmers produce less food than they used to.
d- pesticides are no longer used on most farms
Answer:
b
Explanation:
farmers use mechanical devices to do many tasks
I hope this helps
Whiteflies are common pest insects found on cotton, tomato, poinsettia, and many other plants. Nymphs are translucent and mostly sessile, feeding on their host plant's phloem (sap) from the undersides of leaves. They undergo incomplete metamorphosis into winged adults. Because whitefly nymphs cannot escape predation by moving, you hypothesize that their translucent bodies make them hard to spot by predators. How could you directly test this hypothesis?
Answer: Comparing the rates of predation on whitefly nymphs coated with a nontoxic dye versus the undyed whitefly nymphs.
Explanation:
A hypothesis refers to an assumption, which is proposed for the sake of an argument which is tested to ascertain if it's true.
The hypothesis can be tested by comparing the rates of predation on whitefly nymphs coated with a nontoxic dye versus the undyed whitefly nymphs.
Which phase happens first in meiosis
Science, Geology, Class 8
1. choose the correct answer ( CTCA )
a. what makes the soil fertile?
i. rock particles
ii. humus
iii. sand particles
iv. silt particles
Answer:
Humus
Explanation:
Also known as the uppermost layer of soil, that's for making soil more fertile due to its organic content.
The many volcanoes located along the edge of the Pacific Ocean make up the Ring of Fire. How does subduction play a role in the volcanic activity in the Ring of Fire?
Answer:
The Ring of Fire contains approximately 850–1,000 volcanoes that have been active during the last 11,700 years (about two-thirds of the world's total). The four largest volcanic eruptions on Earth in the last 11,700 years occurred at volcanoes in the Ring of Fire.
Explanation:
Answer:
It helps move the lava in the volcano beneath the earth's crust
Explanation:the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
Anyone help edg hehdjskapaoa
Which of the following describes the feedback that controls the blood pressure in the human
body?
O
When blood pressure drops, hormones from the pancreas tell the heart to beat
more strongly and increase the volume of blood flowing.
When blood pressure drops, hormones from the pancreas tell the heart to beat
more slowly and decrease the volume of blood flowing.
When blood pressure drops, receptors in blood vessel walls tell the heart to beat
more slowly to decrease the volume of flowing
ဝod
When blood pressure drops, receptors in blood vessel walls tell the heart to beat
more strongly and increase the volume of blood flowing.
Answer:
I believe D!!
Explanation:
hope this helps :)
The feedback that controls the blood pressure has ben the dropping of blood pressures has been mediated to the slowly decrease the volume of blood flowing. Thus, option C is correct.
What is blood pressure?The pressure of the blood in the circulatory system is often measured for diagnosis since it is closely related to the force and rate of the heartbeat and the diameter and elasticity of the arterial walls.
Heart failure is common in patients with high pressure. The body’s blood pressure is a measure of the pressures within the cardiovascular system during the pumping cycle of the heart.
In this case, the higher the cardiac output, the higher the volume of the blood in the vessels. Therefore, this increases the pressure in the vessels.
So, that when blood pressure drops, receptors in blood vessel walls tell the heart to beat more slowly to decrease the volume of the blood flowing. Thus, option C is correct.
To know more about blood pressure, follow this link-
https://brainly.com/question/4215574
#SPJ2
Explain how 2 polynucleotides can twist helically around each other to form a double helix of DNA?
Explanation:
The antiparallel arrangement of the two strands is what causes the twist. Because the strands run in opposite directions, they pull the sides of the molecule in opposite directions, causing the whole thing to twist around itself. Most naturally occurring DNA spirals clockwise.In an experiment to investigate a factor affecting photosynthesis, a leaf of a potted plant which had been kept in the dark overnight was covered with aluminum foil as shown in the diagram below 1. Aluminium foil The set up was kept in sunlight for three hours after which a food test was carried out on the leaf. (a) Which factor was being investigated in the experiment? b) What food test was carried out? (i) State the results of the food test (ii) Account for the results in c (i) above
Answer:
Photosynthetic activity.
Explanation:
The photosynthetic activity of the plant was being investigated in the experiment and no photosynthesis will occur because the aluminium foil reflect 95% of sunlight. Starch test is the food test that was carried out in the experiment. Starch from plants is broken down into its constituent sugar molecules by the plant body in order to provide energy to the tissues so if there is no photosynthesis occurs, the plant body uses starch so decrease occur in the concentration of the starch molecules when the starch food test will occur.
Ans:using a filament of spirogyra in a laboratory Demonstrate how plasmolysi wil occur
Answer:
plasmolysis is the shrinkage of protoplast from the cell wall under the influence of a hypertonic solution.this can be observed by placing the fresh filament of spirogyra in a 10% solution of common salt.the cell undergoes exomosis.
I hope this helps
a) What are the bases of mRNA coded for by this section of DNA, before the mutation? (1 point)
b) What are the bases of mRNA coded for by this section of DNA, after the mutation? (1 point)
c) What amino acid is coded for by this sequence before the mutation? (1 point)
d) What amino acid is coded for by this sequence after the mutation? (1 point)
e) Is this is a silent mutation or a missense mutation? Explain. (1 point)
Complete question:
A gene has a base sequence of GTC. Due to a mutation, the base sequence changes to GTG. Answer the following questions:
a) What are the bases of mRNA coded for by this section of DNA, before the mutation? (1 point)
b) What are the bases of mRNA coded for by this section of DNA, after the mutation? (1 point)
c) What amino acid is coded for by this sequence before the mutation? (1 point)
d) What amino acid is coded for by this sequence after the mutation? (1 point)
e) Is this is a silent mutation or a missense mutation? Explain. (1 point)
Answer:
a) mRNA before mutation ⇒ CAG
b) mRNA after mutation ⇒ CAC
c) amino acid before mutation ⇒ Glu, Glutamine
d) amino acid after mutation ⇒ His, Histidine
e) missense mutation
Explanation:
Theoretical frame
Transcription:Transcription occurs in the nucleus where the template DNI strand is read in direction 3´→ 5´ to build the mRNA molecule in direction 5´→ 3´.
When the DNI molecule separates into two strands to form the transcription bubble, we can identify two separate segments: coding strand and template strand.
The coding strand goes in direction 5´ to 3´, while the complementary strand -template strand- grows in direction 3´ to 5´.
The template strand is the mRNA complement.
The coding strand is the same as the mRNA that results from the transcription of the same DNI segment -switching bases T for U-.
The coding strand receives that name because it is the sequence that codes for each amino acid composing the proteins.
Translation:Translation occurs in the cytoplasm. rRNA and tRNA read mRNA in the direction 5´→ 3´ to build the protein.
Genetic information for the aminoacids assembly during the protein synthesis is stored in short sequences of three nucleotides named codons in the mRNA. Each of the codons represents one of the 20 amino acids used to build the protein. There are 64 codons in total, from which 61 codify for amino acids. Because there are 20 amino acids, many codons code for the same amino acid. One of these amino acids is also the start point of protein synthesis. And the left three codons are stopping translation points.
The codons indicating the initiation or stop points during the translation process are:
• The start codon AUG is the most common sequence used by eukaryotic cells
• The end codons are UAA, UAG, UGA.
When a change occurs in a single base pair, it is known as a point mutation. Points mutations might be either silent, missense, or nonsense. In silent mutations, the resulting mRNA codon codes for the same amino acid as the unmutated sequence. However, if the mutation causes the mRNA codon to code for a different amino acid, this mutation is a missense mutation. Finally, if the mutation causes mRNA codon to be a stop codon, we are referring to a nonsense mutation.
----------------------------------------------------------------------------------------------------------
In the exposed example,
Before mutation
Original DNI base sequence ⇒ GTC ⇒ Guanine, Timine, CytokineTranscripted mRNA sequence ⇒ CAG ⇒ Cytokine, Adenine, GuanineAmino acid ⇒ Gln ⇒ GlutamineAfter mutation
Mutated DNI base sequence ⇒ GTG ⇒ Guanine, Timine, GuanineTranscripted mRNA sequence ⇒ CAC ⇒ Cytokine, Adenine, CytokineAmino acid ⇒ His ⇒ HistidineThis is a point mutation, in which the change occurs in a single base pair. The mutation made the mRNA codon code for a different amino acid, meaning that this is a missense mutation.
Before mutation, the mRNA codon is CAG and codes for Glutamine.After mutation, the mRNA codon is CAC and codes for Histidine.Hemophilia is a sex-linked genetic disorder that inhibits the blood’s ability to clot properly. Is the gene that causes hemophilia recessive or dominant?
Answer:
The gene that causes haemophilia is recessive.
Answer:
It’s recessive. The mother who is a carrier is heterozygous, but she does not have the disease. The only offspring who have the disease are the boys who inherited one mutated gene.
Explanation:
edmentum
Describe the role chemical signals play a role in both the nervous system and the endocrine system
what is menstruation and why does it occurs
Answer:
A period happens because of changes in hormones in the frame. Hormones are chemical messengers. The ovaries launch the lady hormones estrogen and progesterone . those hormones motive the liner of the uterus (or womb) to build up. The constructed-up lining is prepared for a fertilized egg to connect to and begin developing. If there is no fertilized egg, the liner breaks down and bleeds. Then the identical manner occurs all once more.
It normally takes about a month for the liner to build up, then smash down. this is why a lot of ladies and women get their periods round once a month.
Source:
https://kidshealth.org/en/teens/menstruation.html
https://www.plannedparenthood.org/learn/health-and-wellness/menstruation
thectgod ig follow
Can you guys help me please ?
Answer:
a
Explanation:
Why are amphibians considered as unsuccessful land vertebrates
The founder effect occurs when Multiple Choice large groups of individuals leave their home population and establish new settlements, mating only among themselves. small groups of individuals leave their home population and establish new settlements, mating only among themselves. many members of a population die, resulting in a great loss of genetic diversity. many members of a population reproduce causing too much genetic diversity within the population. small groups of individuals leave their home population and join established settlements, and mating with natives.
Answer: small groups of individuals leave their home population and establish new settlements, mating only among themselves.
Explanation:
The founder effect is what happens when a small group of individuals leave their home population in order to establish new settlements. They will then mate only amongst themselves and colonize the area without mixing with the natives.
As a result of the founder effect, there is less genetic variation in the new population than in the home one because the smaller number of individuals who left would not possibly be able to carry all the genes in the home population. The only genes that would be passed on are those of the small individuals.
Match the scenario to the career it describes.
1.
Geoff makes sure that a private business complies with laws
protecting deer
wildlife biologist
2. Kara calls the state fire units to respond to a forest fire.
policy analyst
3. Lynette compares proposed policy plans.
forestry manager
what are 2 easy difference between jellyfish and starfish
Answer:
Starfishes have a relatively rudimentary organ system level of body organisation, whereas jellyfishes have merely a tissue system level of body organisation. 2. The body of a jellyfish is transparent and squishy, but the body of a starfish is opaque and has a hard Calcium Carbonate exoskeleton.
Pls can someone tell me the three cells the left side of the heart pumps blood to.
The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body. Your heart has four separate chambers that pump blood, two on the right side and two on the left. How does blood flow through the heart? Blood flows through your heart and lungs in four steps: The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve.
urgent please answer
