Answer:
b.Yes,the allele frequencies changed from 1 generation to the next
The consensus is that the coelacanths and lungfishes (Sarcopterygii) represent an evolutionary link between ray-finned fishes and tetrapods. What is the major feature in the Sarcopterygii that supports this hypothesis?
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.
The compound 2,4-dinitrophenol (DNP) is a lipid soluble compound that has been used as a weight loss agent. It functions this way by causing the inner mitochondrial membrane to become leaky with respect to protons. Which result might be expected if cells treated with DNP were examined in detail
Answer:
ATP production would be slower in these cells than in untreated cells
Explanation:
Oxidative phosphorylation is the third stage of cellular respiration, which occurs in the mitochondria of animal and plant cells. Oxidative phosphorylation represents the most efficient pathway to generate energy in animal cells by the production of Adenosine triphosphate (ATP) as a consequence of the transfer of electrons from nicotinamide adenine dinucleotide (reduced form) (NADH) or flavin adenine dinucleotide (reduced form) (FADH2) to molecular oxygen (O2) through a sequential series of electron carriers. The 2,4-Dinitrophenol (DNP) poison is an uncoupler of oxidative phosphorylation that carries protons across the mitochondrial membrane, thereby leading to a rapid consumption of energy without the production of ATP. This mitochondrial uncoupler (DNP) has been used as a dieting drug during the 30's decade (1930), but was rapidly banned due to its side effects, which include, among others, tachycardia, hyperthermia, tachypnea, and metabolic acidosis.
Single Strand Binding Proteins are responsible for:
A. keeping the strands separated during replication.
B. unwinding and separating the DNA strands.
C. adding the new bases.
D. linking the short sections of the lagging side.
Reset Selection
Answer:
A. keeping the strands separated during replication
Explanation:
Prior to the process of DNA replication, the double-stranded DNA must first be separated into single strands by an enzyme called DNA helicase. This is done so that each DNA strand can serve as template for the synthesis of another.
After the unwinding and separation, the single strands still need to be kept apart during the synthesis of new nucleotides by DNA polymerase. This role of keeping the strands separated during replication is carried out by SINGLE STRAND BINDING PROTEINS.
Unique feature of osmosis is that
(1) energy is required
(2) it involves movement of solutes
(3) it occurs across membranes only
(4) it is seen only in animals
Answer:
I believe the answer is (3)
Explanation:
"Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane"
"Osmosis only occurs with a semipermeable membrane"
Khan and sciencedirect
The increase in temperature with depth in the Earth is called the geothermal ____
Answer:
Geothermal gradient
Explanation:
Answer:
.energy..
Explanation:
Need help!!!
what is an element?
~Thx ^_^
Answer:
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means.
why are virus considered to be nonliving
In which order will free nucleotides add on to a single strand of DNA with the sequence ATTGCA during DNA replication? (2 points) O Uracil, adenine, adenine, cytosine, guanine, uracil Adenine, thymine, thymine, guanine, cytosine, adenine Thymine, adenine, adenine, cytosine, guanine, thymine O Guanine, cytosine, cytosine, adenine, thymine, guanine
Adenine, thymine, thymine, cytosine, guanine, and adenine is the correct order in which nucleotides add on single strand DNA.
What is DNA replication?The process of DNA replication is crucial for cells to divide and create an exact copy of their DNA. Enzymes like helicase play a vital role in unwinding and separating the two strands of the double helix, creating a replication fork that serves as the starting point for this process. As DNA polymerase adds nucleotides to the new strand using the existing strand as a template, it follows specific rules of complementary base pairing: adenine (A) pairs with thymine (T), while cytosine (C) pairs with guanine (G).
What will be order of nucleotides to add on single strand of DNA?During DNA replication, the order in which free nucleotides will add on to a single strand of DNA with the sequence ATTGCA is crucial. The correct sequence of nucleotides that will bind to this template strand is adenine (A), thymine (T), thymine (T), cytosine (C), guanine (G) and adenine (A). This follows the complementary base pairing rules where A pairs with T and C pairs with G. By following these rules, the newly synthesized strand will have a correct sequence of ATTTGC, ensuring accurate replication.
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Why monosaccharides are sweet whereas polysaccharide are not
Answer:
sweet-receptors bind to specific types of molecules, namely monosaccharides and disaccharides. Polysaccharides are not as sweet because they do not readily bind to the sweet-receptors on our tongue, as the other smaller molecules do
Answer:
ywetywte
Explanation:
gwhwhwhebebd
show the following
The unit of power is a derived unit
Answer:
watt is the SI unit of power
Answer:
yes it is a derived unit
Explanation:
P=W/T
work done is always in kgm/s
so therefore
P=kgm/s ÷ s
P=kgm/s × 1/S
P=kgm/s^2
OR
P=Kgms^-2
Which of the following animals has a solitary lifestyle ? A.sika deer B.elephant C. zebra D.rhino
Answer:
A sika deer
my ans is right or wrong
Answer: A: Sika Deer
Explanation: Adult males are solitary for most of the time and will band together sometimes.
A scientist wishes to create bacterial colonies on an agar plate for observation of growth. Unfortunately, directly adding bacteria from the original culture results in too many bacterial colonies to count. In order to create a solution of proper bacterial concentration for observation, the scientist performs a three-step 1:100 serial dilution of the original bacterial culture. What is the dilution factor of the final solution
Answer:
10⁶
Explanation:
A 1:100 serial dilution is a dilution in which the concentration decreases 100 fold (i.e., in each dilution the concentration of the culture must be multiplied by 10⁻²). The question above indicates that a three-step 1:100 dilution was applied, which means >> 10⁻² x 10⁻² x 10⁻² = 10⁻⁶. Moreover, the dilution factor can be calculated by dividing the volume of the diluted solution by the volume of the concentrated solution. The dilution factor is the inverse of dilution, thereby in this case this value is equal to 10⁶ (dilution = 10⁻⁶ >> dilution factor = 10⁶).
what can a person do to limit exposure to X-rays
Answer:
How can I reduce my exposure to radiation from X-rays?
Tell the X-ray technologist in advance if you are, or might be, pregnant.Ask if a protective shield can be used. ...Ask your dentist if he/she uses the faster (E or F) speed film for X-rays. ...Know your X-ray history.You are running a genetics experiment. Which of the following will help you obtain the copies of the gene you need?
A. Ribosome
B. Mesosome
C. Plasmid
D. Nucleus
Answer:
D
Explanation:
i think this is the answer because the nucleus contains threads of DNA called chromosomes.which can help in a genetic experiment.
I hope this helps
In the given context, Nucleus would help in obtaining the copies of the gene.
The nucleus controls and regulates the activities of the cell and carries the genes, structures that contain the hereditary information.
What is Nucleus?In cell biology, the nucleus is a membrane-bound organelle found in eukaryotic cells.
The nucleus was discovered by Robert Brown in 1831.
Nuclear DNA is a multiple long linear molecules in a complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes are structured in such a way to promote cell function.
The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression and thus control the center of the cell.
The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle.
Nucleus houses an organism’s genetic code, which determines the amino acid sequence of proteins critical for day-to-day function, it primarily serves as the information center of the cell has been found that replication happens in a localized way in the cell nucleus.
What is Ribosomes?A ribosome is a complex molecular machine found inside the living cells that produce proteins from amino acids during protein synthesis or translation. The process of protein synthesis is a primary function, which is performed by all living cells.
Ribosomes are specialized cell organelles and are found in both prokaryotic and eukaryotic cells. Every living cell requires ribosomes for the production of proteins.
This cell organelle also functions by binding to a messenger ribonucleic acid (mRNA) and decoding the information carried by the nucleotide sequence of the mRNA.
They transfer RNAs (tRNAs) comprising amino acids and enter into the ribosome at the acceptor site. Once it gets bound up, it adds amino acid to the growing protein chain on tRNA.
What is Mesosome?Mesosome is formed by an extension of the plasma membrane into the cell wall. These extensions are usually in the form of vesicles, tubules, and lamellae.
The main use of mesosomes are:
- Synthesis of a cell wall.
- DNA replication.
- Distribution of daughter cells, respiration, secretions, etc.
What is Plastid?Plastids are double-membrane organelles which are found in the cells of plants and algae.
Plastids are responsible for manufacturing and storing of food. These often contain pigments used in photosynthesis and different types of pigments that can change the color of the cell.
Different types of plastids with their specialized functions are:
- Chloroplasts
- Chromoplasts
- Gerontoplasts
- Leucoplasts
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Necesitouna conclusion sobre la microbiologia y bacteriologia me ayudan pliss
Answer:
.
Explanation:
.uehwbgsbabwh hsbsbs
In Florida, the building collapsed so far away that there was a cordon and no one was allowed to go near and police were standing guard. Is it weird that this kind of accident rescue doesn't let people get close?
How do membrane proteins contribute to the membrane potential?
Answer:
The proton pump results....
Explanation:
double checked my notes
Aquaporins result in a combination of positive charges intracellularly and negative charges extracellularly
What are Aquaporins?
Aquaporin is a group of membrane proteins found in cell membranes and selectively permit water to pass into and out of the cell. Also known as water channels, aquaporins are integral membrane pore proteins. Aquaporins are found in plants, bacteria and animals. They are observed in the vacuolar membranes and plasma membranes. The basic function of most aquaporin is to transport water across cell membranes in response to osmotic gradients created by active solute transport. Aquaporins enable passive transport which means they allow the movement of molecules across a cell without using energy.
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Which is the strongest claim for a presentation about the global problem of a lack of clean drinking water? It is interesting to note that 82% of people who lack access to improved water live in rural areas, while just 18% live in urban areas. Everyone deserves access to clean drinking water, but it is unlikely that this goal can ever be reached. The United States is one of the many countries that are very lucky to have access to well water, bottled water, and tap water. The lack of access to clean drinking water poses a serious health risk around the world, and funds must be raised to help achieve universal access.
Answer:
The lack of access to clean drinking water poses a serious health risk around the world, and funds must be raised to help achieve universal access.
Define instar larva.
Answer:
For most insect species, an instar is the developmental stage of the larval forms of holometabolous (complete metamorphism) or nymphal forms of hemimetabolous (incomplete metamorphism) insects, but an instar can be any developmental stage including pupa or imago (the adult, which does not moult in insects).
Explanation:
Questions for Activity 3: Making Molecular Models of Aerobic and Anaerobic Respiration
Text BoxDraw what you think the models of aerobic and anaerobic respiration would look like if you constructed them using models like in figures 3-6
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Irineu vc não sabe nem eu
sksosmmsos!s s s s s. s sim cofmc. kc c. ocmc c. ximc.
heheheheheheheheheheeheheheeheh
sou toxic
toma trou xa deu mtos pontos atoa kakakakakaja
describe the process of digestion (20marks)
Answer:
The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation. The first of these processes, ingestion, refers to the entry of food into the alimentary canal through the mouth.
Accessory organs: Liver: produces bile salts
Small intestine: Mixes chyme with digestive juice
Stomach: Mixes and churns food with gastric juice
Mouth: Ingests food; Chews and mixes food
Explanation:
urgent please answer
The correct answer is DNA WITHOUT HISTONES.
Explanation:
Prokaryotes are unicellular organisms without membrane-bound organelles. They lack a true nucleus. Instead, they have nucleoid, a genetic material without the nuclear envelope. In prokaryotes, the genetic material is single circular double-stranded DNA without histones. Thus, the correct answer is 'DNA without histones.'
Answer:
the correct answer is 'DNA without histones.'
Explanation:
The state of maintaining a stable internal environment regardless of changing external conditions is called
.
Answer:
homeostasis
Explanation:
Answer:
homeostasis
Explanation:
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Pros and cons about lobsters not feeling pain…
Answer:
The pro of not feeling pain is not feeling pain and the con is pain help you survive like hot hand on stove if u don’t feel pain you probably won’t take your hands off and it can cause death and stuff (u probably know what I mean I hope)
Explanation:
Which of these factors would most likely strengthen the effectiveness of
Answer:
Which of these factors would most likely strengthen the effectiveness of CITES?
Answer: Funding for on-the-ground enforcement
Todos los miembros de dicha familia tienen simpatía por las mismas ideas políticas
Answer:
¿todos los miembros de dicha familia tienen simpatia por las mismas ideas políticas? En las últimas elecciones presidenciales, ¿todos los miembros de dicha familia votaron por el mismo partido?¿Puedes preguntarles cómo votaban los integrantes de esa familia hace veinte años, y hace cincuenta años? ¿Qué ha cambiado? Escribe en tu cuaderno tus averiguaciones
Explanation:
Mi familia tiene diferentes ideales políticos y por eso votaron por diferentes partidos, antes el proceso era manual
En las elecciones actuales les he preguntado a los miembros de mi familia y no todos votaron por el mismo partido político unos creen en uno de los partidos políticos y otros creen en otros. Por lo tanto no todos simpatizan con las mismas ideas políticas
Anteriormente se votaba por medio de un papel escrito, entonces el proceso es mucho más lento y menos automatizado que con maquinas
No, cada familiar tiene una idea política distinta.
-no votaron por el mismo partido político pues siempre algunos presidentes hacen promesas y no las cumplen.
-las votaciones siempre las han realizado por numero de DUI, en institutos o en las calles frente a las alcaldías, tenían que buscar el numero de urna en la cual estaban asignados.
-el cambio a sido la tecnología y el voto residencial, pues con la tecnología se ha hecho mas fácil el cuento de los votos y el voto residencial a permitido que se les facilite asistir al centro de votación.
describe the role of enzymes in seeds germination
Answer:
Enzymes such as amylase ,protease and lipase are liable for solubilizing spare food materials in form of starch, protein and lipids correspondingly
in seed and deliver energy and other fundamentals food materials to germinating embryo.
The seed proteins are catalyzed by protease enzyme and break it into amino acid and peptides that a e transferred to growing embryo.
The amino acids obtained from metabolism of the proteins are further used in biosynthesis of enzymes,hormones,proteins, pyrimidines and Purine bases.
The starch is catalyzed by enzyme amylase that provides the food materials for growth and development of embryo . Similarly lipase are enzymes that are responsible for metabolism of the triacylglycerols into glycerols and fatty acids.This is also the source of energy for growing embryo
Name the 5 systems of the human body.
Answer:
Skeletal System
Muscular System
Circulatory System
Endocrine System
Digestive System
are systems of the Human Body
Explanation:
Answer:
Digestive system
Circulatory system
Respiratory system
Nervous system
Skeletal system
The Paleo-Indian skull of Kennewick Man, dated to 8,400 years B.P. is long and narrow; the face and jaws are robust, is an anatomical difference with late prehistoric and living Native Americans that have short, round skulls with gracile faces. In what state of the USA was Kennewick Man located
Answer:
Washington, near Seattle
Explanation:
Found in 1996 in Columbia park at the bottom of the Columbia River
This is land currently owned by the US Army Corps of Engineers
The muscle weakness of myasthenia gravis results from loss of acetylcholine receptors in the end-plate membrane. the motor neuron action potential being too small to shock the muscle fibers. insufficient acetylcholine release from presynaptic vesicles. excessive acetylcholinesterase that destroys the neurotransmitter. All of the answers probably contribute to the muscle weakness.
Answer:
The correct answer is ''loss of acetylcholine receptors in the end-plate membrane.''
Explanation:
Myasthenia gravis represents a human autoimmune disease. The neuromuscular junction abnormalities that occur in this disease are due to antibody-mediated processes. A reduction in the number of functional acetylcholine receptors on the postsynaptic membrane was established to contribute to the physiological abnormalities of myasthenia gravis. The reduction in receptors is due to immunological alterations directed against the acetylcholine receptor. Normally, when acetylcholine binds to its receptor, it opens allowing the rapid entry of cations, especially sodium. With this, the depolarization of the postsynaptic region of the muscle fiber occurs. Although acetylcholine is normally released in myasthenia gravis, it is not capable of causing an action potential in the muscle sufficient to initiate or weaken contraction. In patients with myasthenia gravis, failure to activate muscles is responsible for myasthenic fatigue. Most patients have elevated serum titers of antireceptor antibodies, which in turn accelerate receptor degradation.
