Which type of cell contains a nucleus?
a.
prokaryotic cell
b.
eukaryotic cell
C.
both types
d.
neither type
PLEASE HELP ASAP!! ( will give brainiest )
3. Sensors on a spider's legs feel the vibrations of a trapped insect and relay the information to the spider's brain through nerve electrical signals. For nerve cells to maintain these electrical potentials, sodium must be removed from the cell and potassium must be moved into the cell. Describe why this process is a form of active transport and what is required for active transport to occur?
Answer:
See below
Explanation:
Active transport is the movement of materials across a membrane that requires an input of energy from a cell. This is because ions move into and out of cells and because cells contain proteins that do not move across the membrane and are mostly negatively charged, there is also an electrical gradient, a difference of charge, across the plasma membrane. the interior of living cells is electrically negative with respect to the extracellular fluid in which they are bathed.
At the same time, cells have higher concentrations of potassium (K+) and lower concentrations of sodium (Na+) than does the extracellular fluid. In a living cell, the concentration gradient of Na+ tends to drive it into the cell, and the electrical gradient of Na+ (a positive ion) also tends to drive it inward to the negatively-charged interior. The situation is more complex, however, for other elements such as potassium.
To move substances against a concentration or electrochemical gradient, the cell must use energy. This energy is harvested from adenosine triphosphate (ATP) generated through the cell’s metabolism. Active transport mechanisms, collectively called pumps, work against electrochemical gradients. Small substances constantly pass through plasma membranes. Active transport maintains concentrations of ions and other substances needed by living cells in the face of these passive movements.
In what ways does carbon enter the hydrosphere?
Answer: When oxygen is present, aerobic respiration occurs, which releases carbon dioxide into the surrounding air or water. Otherwise, anaerobic respiration occurs and releases methane into the surrounding environment, which eventually makes its way into the atmosphere or hydrosphere.
At which point along this stream are sediments most likely to accumulate, forming a point bar?
Question 2 options:
A)
3
B)
2
C)
1
D)
4
Answer:
option A(3)
Explanation:
I think it helps you.
Answer:
3
Explanation:
which question can be answered using the scientific process?
A. Should people be made to reuse all bags?
B. What is the effect of plastic bags on birds?
C. Is it right to make people stop using plastic bags?
D. Is the government doing enough to fight pollution?
Answer: B
Explanation: It is the question 2 that can be answered using scientific process. scientists can better explain the effect of plastic bags on birds.
The other question can be answered by research or logics.
What are the forms of energy that make up thermal energy?
Answer:
Sound is made up of vibrations (put your hand on a stereo speaker), thermal energy consists of moving molecules in air or in an object, and mechanical energy is the combination of kinetic and potential energy of a moving object.
Explanation:
Big brain
Explanation:
sound is made up of vibrations thermal thermal energy consists of moving locals and air of an object a mechanical energy is the combination of kinetic and potential energy of a moving object
Select the first event of DNA replication.
New DNA is proofread
New nucleotides are brought to original strand
Bonds are formed
DNA is unzipped
Answer:
DNA is unzipped
Explanation:
Learned it in Biology
Please help me with question number 17 thank you
Answer:
Picture is not clear
Sorry i don't know
Picture is not clear
Not at all
PLEASE HELP
Which of the following is the best example of a heat insulator?
A
a glass cup
B
a metal fork
C
a diamond ring
D
a pair of wool gloves
D
Explanation:
Wool is an insulator and metal is a conductor glass would break
PLS HELLPPPPPPPP
During which phase of the cell cycle does division of the cytoplasm occur?
A. G
B. S
C. G2
D. M
Answer:
m
Explanation:
Mitosis is divided into four phases: prophase, metaphase, anaphase, and telophase. The shortest stage of the cell cycle is called cytokinesis (division of the cytoplasm). In cytokinesis, the cytoplasm and its organelles divide into two daughter cells. contains a nucleus with an identical set of chromosomes.
Please answer I will give brainliest guarantee.
Answer:ahh yes the ball torture method good one indeed umm the answer will be the 28th option aka letter R
Explanation:
Match the biochemical action with the appropriate hormone: 1) increase in glucose uptake A) glucagon 2) increase in gluconeogenesis B) insulin 3) increase in cAMP levels (muscle) C) epinephrine 4) decrease in lipolysis 5) decrease in glycolysis 6) increase in ketogenesis
Answer:
1) B) insulin
2) A) glucagon
3) C) epinephrine
4) B) insulin
5) A) glucagon
6) A) glucagon
Explanation:
High levels of glucose in the blood promote the release of insulin hormone which functions to stimulate uptake and utilization of glucose by cells. Insulin may also act to inhibit lipolysis in adipocytes and stimulates triglyceride storage. Glucagon hormone controls blood sugar (glucose) by stimulating glycogenolysis (conversion of glycogen to glucose), promoting gluconeogenesis (glucose synthesis), and inhibiting glycolysis (glucose breakdown). Moreover, glucagon also can increase ketogenesis (i.e., the production of ketone bodies by breakdown of fatty acids and ketogenic amino acids) when insulin is inhibited. Finally, epinephrine hormone binds to receptors localized on the surface of muscle cells, which stimulate the production of cyclic-AMP (cAMP), a second messenger (i.e., a signaling molecule).
What do cells that perform similar functions combine to form?
O tissues
O organ systems
O organisms
O organs
Answer:
i just took the test and they are righttt, i have proof
Explanation:
The ultimate source of energy for all life on Earth is the _____________
Answer:
sunlight solar energy
Explanation:
I REALLY NEED HELP PLEASE!!!
According to the Law of Conservation of Matter, if the reactants of photosynthesis have 18 oxygen atoms, how many oxygen atoms will be in the products that are produced?
Answer:
18
Explanation:
all the law is saying is that matter cant be created nor destroyed, so if 18 oxygen atoms are used, there will be 18 oxygen atoms in the end, no matter what, doesn't matter what they use it for or what
There are three types of ecological pyramids. they show the relative amount of what in the trophic levels of an ecosystem?
Answer:
energy or matter
Explanation:
Ecological pyramids show the relative amount of energy or matter contained within each trophic level in a given food chain or food web. the three different types are pyramids of energy, biomass, and numbers
The process of copying an RNA strand is called
Answer:
transcription
Explanation:
What structure represents the nuclear of the cell
NATURAL SELECTION is defined as, individuals that have certain inherited traits tend to survive and reproduce at higher rates because of these traits.
a. True
b. False
The correct answer is true.
It is true that natural selection is defined as individuals that have certain inherited traits tend to survive and reproduce at higher rates because of these traits.
Based on the concepts developed by scientists Charles Darwin, natural selection is the way species and all living organisms on planet earth transform and adapt to the environmental conditions where they live.
Charles Darwin did deep research in South America and some islands in the region and researched fossils, animals, and vegetation.
In 1869, he published his interesting results in a book called "On the Origin of Species."
Answer:
True
Explanation:
I took a test with the same question and i put true and i got it right.
A transformer in a neon sign contains 20 truns in the primary coil and 80 truns in the secondary coil. Which is greater- the output voltage or the input voltage?
Answer:
The output voltage is greater.
Explanation:
The turns ratio is directly proportional. Vs= Vp X (ns/np)
In this neon sign xformer example it is 80/20 or 4
So secondary voltage for 120 volt primary/line voltage = 480 volt secondary volts.
This is practical in a neon sign as it takes more voltage to start the neon gas excitation.
The output voltage is greater.
Calculation of output voltage:Since A transformer in a neon sign contains 20 turns in the primary coil and 80 turns in the secondary coil.
So here turns ratio should be directly proportional. Vs= Vp X (ns/np)
So, In this neon sign former example it is 80/20 or 4
Thus, secondary voltage for 120 volt primary/line voltage = 480 volt secondary volts.
Learn more about voltage here: https://brainly.com/question/14466758
Explain how plants and animals use nitrogen?
Answer:
plants use sunlight energy to produce sugars from water and carbon dioxide
Explanation:
Answer:
plants use sunlight energy to produce sugars from water and carbon dioxide
Explanation:
What is the Toni city of the beaker to the left?
Answer:
what
Explanation:
Which phrase best describes the process of crossing over?
A: Pairs of homologous chromosomes exchange segments.
B: Pairs of sister chromatids exchange segments.
C: Pairs of homologous chromosomes become linked.
D: Pairs of sister chromatids become linked.
Answer:
A
Explanation:
Pairs of homologous chromosomes exchange segments is the phrase that best describes the process of crossing over.
The process of crossing over is the exchange of genetic material specifically of a DNA segment that happens between two pairing chromosomes, that is, they exchange sections of their DNA.
Homologous chromosomes unite in pairs and exchange their genetic information during the germ line.It is very important since it is a phenomenon that contributes to genetic variation, natural selection and adaptation to environmental changes.Therefore, we can conclude that pairs of homologous chromosomes exchange segments of their DNA is the phrase that best describes the process of crossing over.
Learn more here: https://brainly.com/question/21567186
Cosmologists are scientists who study stars, galaxies, black holes, and other objects in the universe. In order to study the billions and billions of stars, cosmologists use highly advanced telescopes and create computer models to trace the stars’ motion. What is one type of limitation that requires cosmologists to use these telescopes?
Answer:
The Cosmologist have to purchase use telescope so they can see the outside world.
what is the importance of biofilms in improving food quality?
Answer: Biofilms have great importance for public health because of their role in certain infectious diseases and importance in a variety of device-related infections.
Hope this helps...... Stay safe and have a Merry Christmas!!!!!! :D
Which of the following terms is used to describe cells containing a nucleus?
a. prokaryotic
b. eukaryotic
c. periodic
d. embryonic
Answer:
b. eukaryotic
Explanation: Eukaryotic cells have a nucleus. The nucleus is where cells store their DNA, which is the genetic material. The nucleus is surrounded by a membrane.
Answer:
I think that
eukaryotic
NEED HELP ASAP!!!!!!
What would be the three amino acids that correspond to the mRNA sequence: GGACACCCG
Question 1 options:
arg, ser, pro
glu, pro, his
gly, his, pro *********
pro, his, pro
Two populations are not yet reproductively isolated if interbreeding results in
Answer:
If internal barriers to gene flow do not evolve, individuals from the two parts of the population will freely interbreed if they ... They result from natural selection, sexual selection, or even genetic drift: ... Genetically-based changes to these aspects of mating could complete the process of reproductive isolation and speciation.
Explanation:
Hope I helped you!!!
Which organisms have many cells that are grouped together into tissues?
A Prokaryotic
B Unicellular
C Bacterial
D Multicellular
Answer: A
Explanation:These organisms are made of prokaryotic cells — the smallest, simplest and most ancient cells. Organisms in the Eukarya domain are made of the more complex eukaryotic cells. These organisms, called eukaryotes, can be unicellular or multicellular and include animals, plants, fungi and protists
