1. What is photosynthesis?
Photosynthesis is a process in which...
Answer: Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
Explanation: During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Answer: photosynthesis is the process in which plants use sunlight , water and carbon dioxide to create oxygen and energy in the form of sugar .
Explanation: hope it helps you .
Edexcel GCSE combined science biology paper 2 2020
If you know any questions please tell me just one will do TOT
Please answer this
Hh
Answer:
Emm... Answer what exactly
help me brainlist if u right.
Not much grass grows on the nesting grounds
why is mechanical digestion of food important?? please help I only need one reason marking brainliest btw
Answer:
it makes the food smaller
Explanation:
Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. It includes mastication, or chewing, as well as tongue movements that help break food into smaller bits and mix food with saliva.
PLEASE HELP ME IM TIMED!
Answer:
its D
Explanation:
which exam are you doing?
According to the dihybrid cross below, what proportion of peas would
be green and smooth?
A) 9/16
B) 1/4
C) 3/8
D) 1/16
Answer: is A. 9/16
Explanation:
What is the
Digestive process
Answer:
the digestive process is the process in which food travels down our thorax into our stomach where the acid breaks it down to gather nutrients and what not to fuel our body then the rest is turned into waste.
Explanation:
Why is it important for each cell to be surrounded by a cell membrane that prevents large molecules from leaving the cell?
Explanation:
because cell membrane protect the cell
lon khoáng nào đóng vai trò đặc biệt quan trọng trong quá trình đông máu?
Answer:
1. Xét nghiệm yếu tố đông máu để làm gì?
Để đánh giá khả năng đông máu như thế nào và quá trình đông máu kéo dài trong thời gian bao lâu, các bác sĩ sẽ tiến hành xét nghiệm các yếu tố đông máu.
Quá trình đông máu sẽ bảo vệ cơ thể bạn khi bị chảy máu. Tuy nhiên, nếu một cục máu đông hình thành trong tĩnh mạch bình thường thì đây là điều hết sức nguy hiểm vì có thể khiến cho dòng máu bị chặn đến tim, não, phổi.
Khi thực hiện xét nghiệm các yếu tố đông máu, sẽ biết được nguy cơ bạn bị chảy máu quá nhiều khi bị thương hay không hoặc có nguy cơ bị đột quỵ không.
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2. Các yếu tố đông máu gồm những gì?
Fibrinogen
Fibrinogen là yếu tố ảnh hưởng lớn đến quá trình đông máu
Sau đây là các yếu tố ảnh hưởng đến quá trình đông máu:
I - Fibrinogen: Fibrinogen là huyết tương có trọng lượng phân tử là 340.000, hòa tan được. Yếu tố này có mặt trong huyết tương với nồng độ là từ 100-700mg/ 100mL. Đa số Fibrinogen được tạo ra ở gan, vì thế đối với những bệnh nhân bị bệnh gan thì lượng Fibrinogen giảm trong máu tuần hoàn, sự đông máu bị ngăn cản.
II- Prothrombin: Prothrombin là protein huyết tương có trọng lượng phân tử là 68.700, có mặt trong huyết tương với nồng độ là 15mg/100mL. Gan sản xuất Prothrombin liên tục, chính vì vậy nếu gan bị suy yếu, lượng prothrombin sẽ giảm, gây ức chế sự đông máu.
III- Thromboplastin mô: Yếu tố này tham gia vào cơ chế đông máu ngoại sinh, thay thế phospholipid tiểu cầu và các yếu tố huyết tương. Bên cạnh đó, thromboplastin còn có tác dụng chống nhiễm khuẩn.
IV- Ca++: Quá trình đông máu không thể không có mặt của loại ion này.
V- Proaccelerin: Khi có nhiều ion Ca++ thì yếu tố này mất hoạt tính. Khi không có proaccelerin, người ta điều chế huyết tương bằng cách để lâu huyết tương lấy từ máu chống đông với oxalat.
VII- Proconvertin: Trọng lượng phân tử của yếu tố này là 60.000. Hoạt tính của yếu tố này trong huyết tương sẽ bị giữ lại trên màng lọc amiang;
VIII- Antihemophilic A: Để tổng hợp yếu tố này, phụ thuộc vào rất nhiều gen trong các nhiễm sắc thể khác nhau. Thường thì antihemophilic được tổng hợp chủ yếu từ gan, lá lách và hệ thống võng nội mô. Khi thiếu ion Ca++ thì yếu tố này mất hoạt tính. Đây là yếu tố chống huyết hữu B;
IX- Antihemophilic B: Chống huyết hữu A.
X- Stuart: Stuart có trong huyết tương, ở dưới dạng không hoạt động. Trong quá trình đông máu nội sinh có sự tham gia của yếu tố này. Khi cho thromboplastin mô vào quá trình đông máu ngoại sinh, sẽ không còn yếu tố stuart.
XI- Plasma Thromboplastin Antecedent (PTA): Quá trình khởi phát đông máu nội sinh không thể thiếu yếu tố PTA.
XII- Hageman: Động lực để tạo thành một loạt phản ứng dẫn đến đông máu là sự tiếp xúc giữa yếu tố XII với mặt trong mạch máu tổn thương cùng sự có mặt của phospholipid tiểu cầu. Bên cạnh chức năng hoạt hóa hệ đông máu, Hageman còn hoạt hóa hệ đông máu, hệ bổ thể và hệ chống đông.
XIII - Fibrin Stabilizing Factor ( FSF): yếu tố này có hoạt tính bền vững trong huyết tương, ổn định fibrin.
Explanation:
During meiosis, the cells that are created are used during
a. regeneration of new tissue
b. regeneration of worn out cells
c. fertilization
d. cytokinesis
e. more than 1 answer is correct
Answer:
C
Explanation:
because fertilization is the fusion of male gamete and female gamete that arises from meiosis
One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome. What is this alteration called
Answer:
A translocation
Explanation:
which process is a plant incapablevof conducting in the dark why
Answer:
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Answer:
During night hours, most plants switch from photosynthesis to the opposite process, respiration, in which carbon dioxide and water are produced rather than consumed.Explanation:
why is cell division important for unicellular and multicellular organisms
Multicellular organisms need cell division to grow and to replace dead or damaged cells and unicellular cell division is the only way single-celled organisms can reproduce. It means the same as cells died.
Those who argue that biology and genetics have the strongest influence on development emphasize ________.
Those who argue that biology and genetics have the strongest influence on development emphasize nature.
What are the influence of the nature in the development?The natures refers the hereditary factors or genes of the child.It helps in building a child's personality traits.It also defines the child's physical appearance.The biology influence development by the gene. One gene cane interact with other gene and environment in which some dominantThe biologically determined characteristics (nature) includes certain genetic diseases ,eye color, hair color, and skin color. The other things are also includes like life expectancy and height but it is also depends upon environment and lifestyle of individual.
The biological factors which includes genetic influences , brain chemistry, hormone levels, nutrition and gender.
The five different forces the influenced human evolution like nature selection, random genetics drifts, mutation, population mating structure and culture.
learn about genetics
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PLEASE HELP ME QUICK ILL GIVE 85 POINTS
Answer: I think b
Explanation: really sry if I’m wrong
Answer:
9j 7 77777 h7jhoa lllll
Explanation:
why it is important to base scientific theories and models on empirical evidence as opposed to other ways of knowing such as religion
Answer:
A theory not only explains known facts; it also allows scientists to make predictions of what they should observe if a theory is true. Scientific theories are testable. New evidence should be compatible with a theory.
Explanation:
PLEASE HELP
Which of these contain
DNA and/or RNA?
Answer:
dna and rna
Explanation:
DNA is a double-stranded molecule, while RNA is a single-stranded molecule. ... DNA and RNA perform different functions in humans. DNA is responsible for storing and transferring genetic information, while RNA directly codes for amino acids and acts as a messenger between DNA and ribosomes to make proteins.Feb 2, 2020
4. According to the data in Tables, which planet in the solar system has the greatest
what table?
Explanation:
Buzz bugs lay eggs that burrow into polar bear skin write any 2 adaptations which it can have (it’s urgent)
Answer: See explanation
Explanation: They could have cold resistances since they are being born in a cold climate.
What is the importance of sea-floor spreading?
Answer:
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
Explanation:
The plasma state occurs when _____.
o Solids are frozen
o gases are heated
o liquids are boiled
o solids are melted
Answer:
B. Gases are heated
Explanation:
Answer:
solids are melted
Explanation:
pls brainliestt
what is the first color of the rainbow?
Answer:
red
Explanation:
Fill out the data table below with the range of each factor that will produce the optimal number of oxygen bubbles.
Answer:
B
Explanation:
why do scientist say "Dont panic"
Answer:
Because you could do something irrational
Explanation:
If laco were mutated, what effect would this have on lactose metabolism?
Answer:
If lacO were mutated, what effect would this have on lactose metabolism? The repressor would not properly bind to the operator, and the lac operon would be over expressed. How does the cell recognize that lactose needs to be metabolized? Lactose is converted into allolactose, which inhibits the lac repressor.
Explanation:
what happens if the cell membrane does not pinch inward during telophase?
Answer:
It doesn’t pinch in for a plant cell because a plant cell has a cell wall. It grows a cell plate
I’m animals cells it should pinch in, but if it doesn’t, the cell can’t divide and you just end up with one cell containing 2 nuclei
Lymph is __________. excess tissue fluid that has escaped from arteries excess tissue fluid that has leaked out of capillaries excess blood that has escaped from veins
Answer:
Excess tissues fluid that has leaked out of capillaries.
What Job classification has the most answer?
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Job classification is what a system is called that is designed to classify all jobs within a company and put them in a standardized scale based on the overall tasks, responsibilities, pay level, and duties associated with a specific job.
what are the consequences of either an incomplete or absent ""s"" stage of the cell cycle?
Answer:
If a cell has not properly copied its chromosomes or there is damage to the DNA, the CDK will not activate the S phase cyclin and the cell will not progress to the G2 phase. The cell will remain in S phase until the chromosomes are properly copied, or the cell will undergo programmed cell death.
Explanation:
The consequences of an incomplete/absent "S" stage in a cell cycle are ;
A programmed cell death The cell will not move to the G2 phase of the cell cycleThe absence or incomplete "s" stage of the cell cycle occurs when the a cell does not completely copy its chromosomes or when there is a significant damage to the genetic material ( DNA ) of the cell. when any of these abnormalities occurs the "s" phase stage of the cell cycle will not be activated until the cell chromosomes are correctly copied. Therefore the cell will not move to the G2 phase of the cell cycle
Hence we can conclude that The consequences of an incomplete/absent "S" stage in a cell cycle are ; A programmed cell death and The cell will not move to the G2 phase of the cell cycle
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