In order to feed the growing population, scientists have found ways to increase the yield of a crop. what does the term yield mean?
amount of food produced in an area.
amount of water used while irrigating.
amount of land needed for a crop.
amount of chemicals used on crops.

The correct answer was

Amount of food produced in an area.  

100% correct Answers

Question 1

Which kind of organism obtains energy only from producers?

herbivores  

Question 2

Which of the following best describes a population?

members of the same species living in the same place at the same time

Question 3

Which of the following describes soil and temperature in an ecosystem?

abiotic factors  

Question 4

A forest fire wipes out all of the plant life in an area, causing the animals to leave. The ground becomes a mixture of soil and ashes. Which order of succession is most likely to occur in the area?

grasses → shrubs → softwood trees → hardwood trees

Question 5

After a town is abandoned, the concrete parking lots remain empty and inactive for hundreds of years. What is the most likely order of ecological succession in that area?

lichens → grass → shrubs → trees

Question 6

The graphs show the trends in biodiversity of land-based life and marine-based life. Choose the answer that best fits the graph.  

the sustainability of ecosystems is decreasing regardless of protected areas.

Question 7

Read the passage "Easter Island Palm." Choose the answer below that best fits the problem on Easter Island.  

EASTER ISLAND PALM

In the 1400s, the Easter Island palm became extinct due to overharvesting. Reproduction was nearly impossible because islanders introduced rats when they first arrived. These rats ate the Easter Island palm seeds, preventing the Easter Island palm from flourishing. With the disappearance of the palm, the islanders could no longer build the boats they needed for fishing.

a decrease in the temperature, leading to decreased biodiversity

Question 8

The primary reason that the human population has grown rapidly over the past 100 years is that there has been

an increase in food supplies and better access to clean water.

Question 9

Which of the following would cause a decrease in a population's size?

emigration  

Question 10

Decisions made by the current generation

can open or limit possibilities of future generations.  

Question 11

In order to feed the growing population, scientists have found ways to increase the yield of a crop. What does the term yield mean?

Amount of food produced in an area.  

Question 12

Which factor can cause secondary succession?

clear cutting  

Question 13

What is the role of a pioneer species in primary succession?

to create the soil  

Question 14

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

endangered  

Question 15

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

clumped

answer; ///i believe its: ///(embolus);

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.