Prokaryotic cells have the following features: The genetic material (DNA) is localized to a region called the nucleoid which has no surrounding membrane. The cell contains large numbers of ribosomes that are used for protein synthesis. At the periphery of the cell is the plasma membrane.
Answer: 1.Prokaryotes lack an organized nucleus and other membrane-bound organelles. Prokaryotic DNA is found in a central part of the cell called the nucleoid. The cell wall of a prokaryote acts as an extra layer of protection, helps maintain cell shape, and prevents dehydration.
2.Prokaryotic cells are surrounded by a plasma membrane and have DNA, cytoplasm, and ribosomes, like eukaryotic cells. They also have cell walls and may have a cell capsule. Prokaryotes have a single large chromosome that is not surrounded by a nuclear membrane.
3.Eukaryotic cells are larger than prokaryotic cells and have a “true” nucleus, membrane-bound organelles, and rod-shaped chromosomes. The nucleus houses the cell's DNA and directs the synthesis of proteins and ribosomes.
Explanation:
how you think reproduction differs among these four animals.
a. bird. b. human c. ants d. sea stars
Answer:
c
Explanation:
ARTH SCIENCE: Section 14-7 Astronomy - Quarter 1
Ch 25.1 & 25.2 quick check
Question 10
What will be the final stage in the sun's life cycle?
a
black dwarf
b
planetary nebula
Review Answers
Back
Answer:
Black Dwarf
Explanation:
i hope this helps
ttaccgg taacgca cgcatgt tgaccta gccaatt
Answer: Uh okay then
Explanation:
Answer:
tacgagcatgcatgca
tgca gcta tagac tacg
1. Many early farmers of the Western U.S. plains believed a theory called
"Rain Follows the Plow." What was the problem with this theory?
5 points
a. Farming actually makes it rain less, not more.
b. The climate at the time farming took place was not any different than normal.
c. The usually high precipitation during this period of early farming and settling was a
coincidence
d. This theory is actually true. Farming and settling an area makes it rain more
frequently
Answer:
d
Explanation:
because when you plough your field for crops to grow rain falls for the crops to yeild well
7) Select 2 that apply.
Which nucleotides can pair together? Select all that apply.
please help
Answer:
Adenine(a) and Thymine(t), Cytosine(c) and Guanine(g)
Explanation:
Which of the following limiting factors would have the least affect on poulation size?
A.
drought
B.
succession
C.
wildfire
D.
decomposition
Answer: D
Explanation:
Which of the following nutrients is NOT an element supplied as a soil amendment in fertilizers?
O potassium
O nitrogen
O phosphorus
hydrogen
Answer:
hydrogen
Explanation:
"Fake News" ______________________ news you disagree with It is outright ______________ or ____________________ stories by minor sources It is NOT the ______________________ media (ABC, CBS, CNN, Fox, NBC) These news agencies might have _________, but they are __________________ sources of news
Answer:
Fake news is not; false; misleading; mainstream; bias; legitimate.
Explanation:
Fake news is not news you disagree with. It is outright false or misleading stories by minor sources. It is NOT the mainstream media (ABC, CBS, CNN, Fox, NBC). These news agencies might have bias, but they are legitimate sources of news.
This ultimately implies that, fake news is considered to be a propaganda which typically involves deliberately sharing or peddling false informations, misleading information or hoax statements mainly through social media channels for defamation or fraudulent purposes.
up to about three thousand million years ago there was no oxygen in Earth's atmosphere today about one-fifth of the atmosphere is oxygen gas. suggest what caused this change???
pls help
Answer:
Oxygen makes up about one-fifth the volume of Earth's atmosphere today, and is a central element of life as we know it.
But that wasn't always the case. Oxygen, although always present in compounds in Earth's interior, atmosphere, and oceans, did not begin to accumulate in the atmosphere as oxygen gas (O2) until well into the planet's history. What the atmosphere was like prior to oxygen's rise is a puzzle that Earth scientists have only begun to piece together.
Earth coalesced a little more than 4.5 billion years ago from bits of cosmic debris. Liquid oceans existed on the planet almost from the beginning, although in all likelihood they were repeatedly vaporized by the massive meteorites that regularly clobbered the planet during its first 700 million years of existence. Things had settled down by 3.8 billion years ago, when the first rocks that formed under water appear in the geologic record. (They exist in what is now southwest Greenland.)
If Earth had water, it must have had an atmosphere, and if it had an atmosphere, it must have had a climate. What was Earth's early atmosphere made of? Nitrogen (N2), certainly. Nitrogen makes up the bulk of today's atmosphere and likely has been around since the beginning. Water vapor (H2O), probably from volcanic emissions. Carbon dioxide (CO2), also emitted by volcanic eruptions, which were plentiful at that time. And methane (CH4), generated inside the Earth and possibly also by methane-producing microbes that thrived on and in the seafloor, as they do today.
Carbon dioxide, water vapor, and methane played an important role in Earth's subsequent development. Four billion years ago, the Sun was 30 percent dimmer, and therefore colder, than it is today. Under such conditions, Earth's water should have been frozen, yet clearly it wasn't. The water vapor, carbon dioxide, and methane acted as greenhouse gases, trapping heat and insulating the early Earth during a critical period in its development.
Of oxygen, meanwhile, the early atmosphere held barely a trace. What did exist likely formed when solar radiation split airborne molecules of water (H2O) into hydrogen (H2) and oxygen (O2). Hydrogen, a lightweight gas, would have risen above the atmosphere and slowly been lost to space. The heavier oxygen gas, left behind, would have quickly reacted with atmospheric gases such as methane or with minerals on Earth's surface and been drawn out of the atmosphere and back into the crust and mantle. Oxygen could only begin to accumulate in the atmosphere if it was being produced faster than it was being removed'—in other words, if something else was also producing it.
That something was life. Although the fossil evidence is sketchy, methane-producing microbes may have inhabited Earth as long ago as 3.8 billion years. By 2.7 billion years ago, a new kind of life had established itself: photosynthetic microbes called cyanobacteria, which were capable of using the Sun's energy to convert carbon dioxide and water into food with oxygen gas as a waste product. They lived in shallow seas, protected from full exposure to the Sun's harmful radiation. (To learn more about these organisms and the fossil evidence for them, watch the accompanying video "Early Fossil Life.")
Help me please I don’t understand I rlly need the answer
Answer:
True
Explanation:
I read it at biology class
5. The structures pictured in Fig. 1 are found on the undersurface of a leaf.
What is the name and function of these structures?
Please i really need help because i’m french and it’s hard
Answer:
I think the black ones are stomata or guard cells and they are attached on epidermis
Stomata is used for breathing and epidermis is the skin(outer layer) of plants
Explanation:
I hope this helps a little please give me brainliest
Answer:
epidermis
provides barrier against injury and water loss
guard cells
surrounds stomata also closes and opens stomata
stomata
allows gaseous exchange
Explanation:
how would you describe the motion of a transverse wave
Answer:
Transverse wave, motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance. ... Surface ripples on water, seismic S (secondary) waves, and electromagnetic (e.g., radio and light) waves are examples of transverse waves.
Explanation:
hope it helps you.
The agricultural research facility during a research accidentally changed the DNA sequence of a wheat plant from GCCATGTT to GCGTACTT and this mutation resulted in a stronger plant variety. What kind of mutation did the plant undergo? A. inversion B. substitution C. insertion
Answer:
Substitution!
Explanation:
The researcher substituted GCCATGTT for GCGTACTT. The underlined section is what was changed. Hope this helps!
Why is osmosis an example of facilitated diffusion? HELP ASAP!!
What 2 things must pass out of the nuclear pores?
Answer:
The two things that must pass through nuclear pores are small polar molecules, ions, and macromolecules (proteins and RNAs)
Explanation:
Answer:
small molecuels and ions
Explanation:
Give two examples of proteins
Answer:
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting molecules from one location to another. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific 3D structure that determines its activity.
Answer:
Actin and coronin are two examples of proteins.
If one was able to view the individual particles in each of these substances, which particles would appear to be moving the FASTEST?
A) the water molecules in a sheet of ice
B) the neon plasma in a fluorescent 'Open' sign
C) the atoms in the liquid mercury of a thermometer
D) the carbon dioxide molecules in the fizz of a cola drink
Answer:
D and A are devently slow My guess would be B or C, since a neon sign usually turn on instantly (or technical within mil a seconds) Its probably the fastest
my guess is C
Which statement is not true about DNA replication?
Group of answer choices:
Eukaryotes replicate their DNA
DNA replication occurs before a cell divides
Prokaryotes replicate their DNA
Cytosine is an enzyme the helps in replication
Answer:
Cytosine is an enzyme the helps in replication.
Explanation:
Cytosine is the name of the nitrogenous base of DNA. Basically, cytosine makes up DNA.
"Cytosine is an enzyme that helps in replication" is not true about DNA replication. Therefore, option (4) is correct.
Cytosine, one of DNA's four nucleotide bases, does not replicate DNA. Before a cell divides, DNA is replicated perfectly. Eukaryotic and prokaryotic organisms have it. DNA replication requires numerous enzymes. DNA polymerases add nucleotides to build new DNA strands. Helicases unwind the DNA double helix to form a replication fork. Primases make DNA-synthesis-starting RNA primers. Ligases link newly synthesised DNA segments.
Eukaryotes replicate DNA in the nucleus during the S phase. The cytoplasm replicates prokaryotes. These procedures faithfully transmit genetic information to daughter cells. Therefore, option (4) is correct.
Learn more about Cytosine, here:
https://brainly.com/question/2863615
#SPJ6
the rate of a chemical reaction is dependent upon?
Explanation:
Reactions occur when two reactant molecules effectively collide, each having minimum energy and correct orientation. Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
4) What is the most important chemical made during the light-independent reactions? It stores the energy that came from the sun.
The Calvin Cycle
Once in the mesophyll cells, CO2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis.
All organisms are heterotrophs.
A) True
B) False
Answer:
(b) false all organism are not hetrotrophs
Answer:
False, plants are autotrophs
Autotrophs=organisms that process their food by their own
Explanation:
I hope it helped, please give me brainliest
Agricultural science
Unscramble these word
Gctitavee-
Suscrptepu-
Apgotainpro-
Treigoenan-
Xleaasu-
Dorplecuoir-
Ificriata-
Eeeemddrrpnit-
Sciieetccnd-
Mcitssye-
Rrllaatspi-
Ooossiunp-
Nniigtomear-
Answer:Eeeemddrrpnit-
Explanation:
How does a logistic growth curve differ from an exponential growth curve?
Answer:
A logistic growth curve is S-shaped. Populations that have a logistic growth curve will experience exponential growth until their carrying capacity is reached, at which point their growth begins to level. An exponential growth curve is J-shaped.
Explanation:
Answer:
Explanation:
A logistic growth curve is S-shaped. Populations that have a logistic growth curve will experience exponential growth until their carrying capacity is reached, at which point their growth begins to level. An exponential growth curve is J-shaped.
Judy took some dead grass and soaked it in water for a few days. Then she looked at it under a microscope. She saw some tiny things moving around under the microscope. How could Judy tell whether what she was looking at were living things? Check all of the following that could be used to decide whether the things Judy saw were living. (
Answer:
Living Cells created from the dead grass
Explanation:
Because the water has nutrients.
These organisms are so important for an ecosystem that their removal would cause the entire ecosystem to change.
Answer:
keystone species
Explanation:
What organelle wouldn’t have a job if the smooth and rough ER didn’t work?
Answer: The Golgi apparatus.
Explanation: I believe it is the Golgi apparatus as the Rough ER and Smooth ER create proteins and sort them in to piles before sending to the Golgi apparatus to deliver.
The Smooth ER and Rough ER are like the suppliers while the Golgi apparatus is like the transporter.
Remember: Proteins have many functions and are needed severely to perform those actions that without the Golgi apparatus, those proteins wouldn’t be able to be transported.
ill give brainliest to anyone who helps me with this
Describe the processes of transcription and translation in your own words
Terms to use in your answer: amino acid, anticodon, codon, gene, messenger RNA, nucleotide, ribosome, RNA, RNA polymerase, transcription, transfer RNA, translation.
Answer:
Explanation:
The genes in DNA encode protein molecules, which are the "workhorses" of the cell, carrying out all the functions necessary for life. For example, enzymes, including those that metabolize nutrients and synthesize new cellular constituents, as well as DNA polymerases and other enzymes that make copies of DNA during cell division, are all proteins.
In the simplest sense, expressing a gene means manufacturing its corresponding protein, and this multilayered process has two major steps. In the first step, the information in DNA is transferred to a messenger RNA (mRNA) molecule by way of a process called transcription. During transcription, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed to form mature mRNA (Figure 1). The resulting mRNA is a single-stranded copy of the gene, which next must be translated into a protein molecule.
please help, give explanation please!
Answer:
1. 0 chance (0%)
2. 2 chances (50%)
3. 4 chances (100%)
Explanation:
the way a punnet square works is that you basically multiply two genes. for example:
b b
B Bb Bb
b bb bb
then, if it's uppercase, it is dominant. if it's dominant, it will take over the recessive gene. if it was Bo, B being brown and dominant, and o being recessive and orange, then brown would take over. there are also cases with codominant but that's not in the question. feel free to ask me anything about this.
HELP I really need an answer for this!! Does anyone know?
Enzyme X catalyzes the conversion of substrate A into product B. If you wanted to use enzyme X to catalyze a different reaction, the new substrate would have the best chance of working with enzyme X if it has the same
A. charge as substrate A
B atomic composition but different structure as substrate A.
C. molecular weight as substrate A.
Dthree-dimensional shape and charge distribution as A.
Answer:
A
Explanation:
which best describes a gene? 1. the short arm of a a chromosome 2. tightly coiled strands of DNA 3. the center of a chromosome 4. a segment of chromosomal DNA
Answer:
It's D. A segment of chromosomal DNA.
Explanation:
The functional and the physical element of genetics are called genes. They get inherited in the form of pairs from the parents of the offspring.
The genes are best described as:
Option 4. A segment of chromosomal DNA.
The statements can be explained as:
The short arm of the chromosomes is called a P-arm found on the chromosomes either the above or the below section of the centromere.Chromosomes are the tightly bonded thread-like configurations of DNA surrounding the histone protein.The centromere is in the middle of the chromosome that holds the two sister chromatids of the chromosomes.Genes are the element of the DNA that codes for proteins and determine the functions of the cells and attributes.Therefore, the correct option is D.
To learn more about genes follow the link:
https://brainly.com/question/787658