How much land do farms take up in the United States?
over half of all the land in the nation
half of all rural land
less than half of the Midwest
half of all the land in the lower 48 states
Answer: Source: USDA NASS, 2012 Census of Agriculture. changed little, declining from 922 million acres in 2007 to 915 million acres in 2012 (or 40.8 percent of U.S. land to 40.5 percent). The average size of U.S. farms in 2012 was 434 acres, 4 percent larger than five years earlier.
Food production takes up almost half of the planet's land surface and threatens to consume the fertile land that still remains, scientists warn. The global impact of farming on the environment is revealed in new maps, which show that 40 percent of the Earth's land is now given over to agriculture.
over half of all the land in the nation
Explanation:
Answer: over half of all the land in the nation
Explanation:
just did it
Scientists can use a virus as a vector to insert a gene directly into a target cell in someone's body. What is this technique called?
Answer:
Gene therapy
Explanation:
Gene therapy is the addition of new genes to a patient's cells to replace missing or malfunctioning genes. Researchers typically do this using a virus to carry the genetic cargo into cells, because that's what viruses evolved to do with their own genetic material
True or false
DNA replicated during interphase
Answer:
True i think
Explanation:
hope this helps tell me if im right or wrong
Which medium grain sized metamorphic rock is composed mostly of the same mineral as the sedimentary rock limestone?
Answer:
Explanation:
Marble
Calcite-containing dolostone has undergone a metamorphosis to become marble (or dolomite), white marble develops when the limestone is pure.
What is a metamorphic rock?Calcite or dolomite recrystallization often results in bigger interconnecting crystals. Despite having a similar appearance to quartz, marble and quartzite are more softer than quartz.
By changing limestone under heat and pressure, marble is a metamorphic rock. As interlocking grains expand, the calcite in the limestone changes, and the original limestone's layers and fossils vanish.
Therefore, marble, when limestone, a sedimentary rock, is buried for millions of years under great pressure and heat, marble, a metamorphic rock, can be created.
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What type of cells does mitosis produce
Gametes
When a cell divides by way of mitosis, it produces two clones of itself, each with the same number of chromosomes. When a cell divides by way of meiosis, it produces four cells, called gametes. Gametes are more commonly called sperm in males and eggs in females.
help mee33333333 plssss
Answer:
Explanation:
Brain control
Each section of DNA that is used to make proteins is called a
Answer:
genes
Explanation:
CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION THANK YOU !!!
Answer:
economic
Explanation:
A solar eclipse occurs when Earth passes into a __________ moon's shadow. A lunar eclipse occurs when a _________ moon passes into Earth's shadow.
A. crescent; gibbous
B. gibbous; crescent
C. new; full
D. full; new
Answer:
answer might be d
hope it helps you : )
Explanation:
5.5 mg equals how many kg
Answer:
5.5e-6 or .0000055
Explanation:
just move the decimal back 6 times to get the answer.
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Answer:
It equals 6 kg
Explanation:
The inside of the cell contains low concentrations of _____ and high concentrations of _____
Answer:
low glucose and high starch
Explanation:
a cell contains 5% glucose, 10% starch, and 5% protein. the solution outside of the cell contains 10% glucose, 5% starch, and 20% protein.
Marking PEOPLE AS BRAINLIST
what is the purpose of mitosis
Answer:
the purpose of mitosis is that the new cell can divide in to two new cells
Explanation:
True or false? A prokaryotic cell is more complex than an eukaryotic cell.
Answer:
False, prokaryotic cell is smaller and less complex, a eukaryotic cell makes their own power plant called mitochondria
A gene carries the ____ for a trait
Answer:
Code
Explanation:
Which of the following molecules directly participates in the process of translation?
Which of the following molecules directly participates in the process of translation?
mRNA, DNA, and rRNA
mRNA, tRNA, DNA, and rRNA
mRNA, tRNA, and rRNA
mRNA, tRNA, and DNA
Answer:
mRNA, tRNA, and rRNA
Explanation:
Translation is the second process of gene expression involving the synthesis of proteins from mRNA strand in the ribosomes. mRNA is the template for the translation process to occur. However, other certain molecules are necessary for the occurrence of translation.
The molecules that directly participates in the process of translation include:
- mRNA, which is transported from the nucleus into the cytoplasm (ribosomes) to be read.
- tRNA, this is a type of RNA present in the ribosomes whose function is to read the codons of the mRNA and carry corresponding amino acids to the peptide chain.
- rRNA, is another type of RNA that makes up the ribosomes and functions in the synthesis of proteins from the amino acids.
mRNA, tRNA, and rRNA directly participate in the process of translation.
During gene transcription, a specific sequence of DNA called gene is utilized as a template to create a messenger RNA (mRNA).This mRNA then travels to the ribosomes where is used to create a protein by a process called translation.The ribosome is a ribonucleoprotein complex consisting of proteins and ribosomal RNA (rRNA) sequences.The triplets of nucleotides or 'codons' in the mRNA indicate the linear order of amino acids that will be added to the protein.The transfer RNAs (tRNAs) are molecules that transport specific amino acids to the ribosomes and pair them via anticodon sequences that match the codon in the mRNA.In conclusion, mRNA, tRNA, and rRNA directly participate in the process of translation.
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What type of mutation is shown below original dna- CTACTCGTGGGT Mutated Dna- CTACTCCGTGGGT
Answer:
The type of mutation would be the frame shift mutations
The synthesis of cholesterol is a process that involves over 30 different steps. Which step is the rate-determining step of cholesterol synthesis?1) The conversion of mevalonic acid to isopentenyl pyrophosphate2) The conversion of squalene into squalene 2,3-epoxide by squalene monooxygenase.3) The condensation of two acetyl-CoA molecules to acetoacetyl-CoA by thiolase.4) The conversion of HMG-CoA to mevalonate by HMG-CoA reductase.
Answer:
The conversion of HMG-CoA to mevalonate by HMG-CoA reductase
Explanation:
Cholesterol is one of the steroids found in the cell membranes of the eukaryotes, mainly in animal cells. It has a long fatty acid chain that is derived from the acetyl CoA. Biosynthesis of cholesterol includes four steps. The first step is the condensation reaction that forms mevalonate from the three acetate residues. The mevalonate is a six-carbon substance. It is followed by the formation of the isoprene units from the mevalonate.
The first step of the cholesterol biosynthesis that forms mevalonate from the acetate is a rate-limiting step. First, two molecules of acetyl CoA react to form acetoacetyl-CoA. It is followed by the joining of the third acetyl CoA to form HMG-CoA, a compound with six carbon atoms. The synthesis of the HMG-CoA from acetoacetyl-CoA is catalyzed by the HMG-CoA synthase. The HMG-CoA is then reduced into mevalonate, a reaction catalyzed by HMG-CoA reductase. Here, two molecules of NADPH serve as electron donors.
The pathway of cholesterol biosynthesis is regulated by the concentration of the cholesterol present in the cell and the pancreatic hormones. Accordingly, the expression of the gene encoding HMG-CoA reductase is regulated to determine the rate of the pathway, making this step a rate-determining step.
HMG-CoA reductase is present in two alternative forms: the phosphorylated form is the inactive form while the dephosphorylated form is the active form of the enzyme.
When the cholesterol levels are high, the hormone glucagon triggers the inactive of the enzyme by its phosphorylation. This covalent modification is reversible and the enzyme is dephosphorylated under the influence of hormone insulin when the intracellular cholesterol levels are low. In this way, covalent modification of the enzyme HMG-CoA reductase regulates the cholesterol biosynthesis.
A molecule of DNA is made up of _________.
Question 19 options:
a.amino acids and proteins
b.ATP and enzymes
c.paired nucleotides
d.receptor enzymes
DNA and RNA are nucleic acids made up of long strands of 100's of nucleotides. What is the only difference in each nucleotide?
Answer:
Nucleic acid types differ in the structure of the sugar in their nucleotides–DNA contains 2'-deoxyribose while RNA contains ribose (where the only difference is the presence of a hydroxyl group).
Explanation:
You pull your desk along the floor in your classroom. What does this situation best demonstrate?
Potential Energy
An alternate energy source
Gravity
Work
Answer:
Work
Explanation:
Work can be referred to as the application of a force (F) over a distance (d). In other words, WORK is done when an applied force causes a body to move. Hence, work is a product of the force and the displacement in the direction of the force i.e. W = F × d
In this case, a desk is PULLED along the floor in your classroom, this best indicates WORK because a force (pull) is applied on the desk causing it to move over a distance in the direction of the pull.
Muscle contraction requires lots of energy. Describe the three ways muscle cells generate ATP. Be sure to include which pathway will supply energy the quickest and which will supply energy over the longest period of time.
Answer: Direct Phosphorylation( quickest), Anaerobic Respiration, Aerobic Respiration (longer period of time).
Explanation: The energy which can be used by our body for muscle contractions can be generated by muscles cells in three different ways. These includes:
--> Direct Phosphorylation
--> Anaerobic Respiration and
--> Aerobic Respiration.
DIRECT PHOSPHORYLATION: As ATP is used up, it's re-stocked by the small reserve of energy stored as creatine phosphate. Creatine phosphate very rapidly donates its high-energy phosphate to ADP the moment ADP forms, converting it back to ATP. This extra source of ATP is easily mobilized and is very effective as long as it last. It's limited though because the store of creatine phosphate is small. (Normally the supply of creatine phosphate is re-stocked by oxidative metabolism via the ATP produced by the citric acid cycle, but during intense exercise there is not enough time to do this so the stock is burned in 20-25 sec making it the QUICKEST way to supply energy)
ANAEROBIC RESPIRATION: When oxygen levels in the cells are low, glucose molecules undergoes glycolysis to produce 2 molecules of pyruvic acid( ATP). The pyruvic acid is converted anaerobically to lactic acid. The build up of lactic acid causes the pain and cramps of overexercised muscles. It is a fast but an inefficient way of producing ATP for energy use.
AEROBIC RESPIRATION: This occurs only if the oxygen supply is adequate and is the process by which energy is released during prolonged exercise. It utilizes glucose and glycogen. During the glycolysis process, a glucose molecule is converted to 2 molecules of ATP in the cytoplasm of cell. In the presence of sufficient oxygen, the pyruvic acid enters the citric acid cycle and oxidative phosphorylation giving rise to the by products of 36 ATP, carbon dioxide and water. Aerobic respiration is SLOW (takes the longest period) but efficient process.
why is it important that the dna polymerase be heat resistant
Answer: Heat stable DNA Polymerase; heat stability is very important because PCR reaction is performed at various temperatures. This heat stable DNA polymerase is obtained from a thermophilic bacteria Thermus aquaticus, the inhabitant of hot springs. Hence, this DNA polymerase is termed as Taq DNA Polymerase.
DNA polymerase I function to fill DNA gaps that arise during DNA replication, repair, and recombination.
DNA polymerase:t's DNA polymerase is very heat stable and is highly reactive at 70*C. This heat stability makes Taq polymerase ideal for PCR, as high temperature is used repeatedly in PCR to denature the template DNA, or separate its strands. Polymerase activity is strongly influenced by temperature.
Taq DNA polymerase is the most common enzyme used for PCR amplification.
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Which of the following is true of the Situational Leadership Model? a. It is a powerful, rigid tool that is based on the relationship between different types of followers. b. It allows leaders to approach coaching and influence opportunities through the lens of task-specificity. c. It fails to provide leaders with an understanding of the relationship between an effective style of leadership and the level of readiness that followers exhibit for a specific task. d. It requires leaders to make generalizations about a follower's overall level of ability and motivation.
Answer:
The correct answer is - b. It allows leaders to approach coaching and influence opportunities through the lens of task-specificity.
Explanation:
The situational leadership model is a model that deals with various aspects and adaption for better leadership. It helps to influence the peer of the team members and create new opportunities.
It considers different variables in the workplace and situation. Based on condition, situation, and other variables they can choose the style of leadership style will be best depends on their goal or task-specific.
Thus, the correct answer is - b.
Energy and oxygen are created from visible sunlight during the __________.
Answer:
Photosynthesis? I guess.
Answer:
During photosynthesis
How is a compound different than the elements that make up the compound ?
Answer: An element is a material that consists of a single type of atom.
Explanation: Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
Which of the following represents an activity within a population?
a.
the absorption of nitrogen by bacteria and converting it to a form useful to plants
b.
moss growing on the north side of a large pine tree
c.
a virus causing rabies in a dog
d.
a peacock spreading and shaking his feathers to attract a female
e.
a fox consuming a rabbit
Explanation:a peacock spreading and shaking his feathers to attract a female
A peacock spreading and shaking his feathers to attract a female represents an activity within a population. So, the correct option is (D).
What is Population?
Population is the number of people in a single area, be it a city or town, region, country, continent or the world. A population is any complete group that has at least one characteristic in common. They are not just people.
It may consist of, but is not limited to, people, animals, businesses, buildings, motor vehicles, farms, objects or events. It is an average calculated from an entire group, distribution, or population that is obtained by dividing the sum of all population variables by the total number of variables in the population.
Here μ is the population mean. ∑X is the sum of all the observations in the space.
Thus, a peacock spreading and shaking his feathers to attract a female represents an activity within a population. So, the correct option is (D).
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Which term describes the resting phase of the cell cycle?
Answer:
More appropriately called interphase. The interval in the cell cycle between two cell divisions when the individual chromosomes cannot be distinguished, interphase was once thought to be the resting phase but it is far from a time of rest for the cell.
Which type of molecule that can be found in living things
protein
carbohydrate
rat
water
Answer:
Carbohydrate and protein
Explanation:
I think the carbohydrate and protein can be found in living things
HELP ME ASAP!!!
Select the correct answer.
What are ectothermic species?
A. species that can generate heat from their internal processes
B. species that live in cold climates
C. species that derive heat from the environment
D. species that live in the ocean
The answer is C
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After pollen lands on the stigma of a flower, which of the following happens first?
Fertilization takes place.
An embryo grows inside the ovary.
The pollen grows a tube to the ovary.
The pollen units with an egg cell.
Answer:
The pollen grows a tube to the ovary.
Explanation:
After pollen grains land on the stigma, a pollen tube grows from the pollen grain, through the style, and into the ovary. Sperm cells inside the pollen grain travel down the pollen tube and into the ovary which contains the ovules. Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule.
Answer:
The pollen grows a tube to the ovary.
