Edexcel GCSE combined science biology paper 2 2020
If you know any questions please tell me just one will do TOT

Answers

Answer 1
Just look up the mark scheme online

Related Questions

FIRST ONE TO ANSWER GETS BRAINLEST ANSWER How does the skull's structure help it perform its function?

a. The skull has marrow in it which produces blood cells

b. The skull has sharp teeth which are used in eating

c. The skull is hard which protects the brain from being injured

d. The skull is flexible which allows the brain to grow

Answers

Answer:

c. The skull is hard which protects the brain from being injured

Explanation:

Answer:

The one that makes sense is C.) "The skull is hard which protects the brain from being injured." here's why:

Explanation:

The skull performs vital functions. Mainly, it supports and protects the head's soft tissues. The baby's skull is soft but as the bones developed, the bones of the skull form a tough, fibrous membrane and slowly fuse to form a single skull. The mandible is the only bone that separates from other parts of the skull. The skull or known as the cranium in the medical world is a bone structure of the head. It supports and protects the face and the brain. The adult skull has a total of 22 individual bones. They don’t move and united into a single unit. The skull performs vital functions. Mainly, it supports and protects the head’s soft tissues. The baby's skull is soft but as the bones developed, the bones of the skull form a tough, fibrous membrane and slowly fuse to form a single skull. The mandible is the only bone that separates from other parts of the skull. So, as our cranium grow it gets tough enough to protect the brain from injury!

hopefully I helped! have a great day!

NEED IT ASAP!!! Which statement about the specific immune response is FALSE?
Clonal selection creates short-lived effector cells to destroy the specific antigen.
Clonal selection produces memory cells that are long-lived and can recognize the antigen in the future.
It takes about two weeks for memory cells to respond to an antigen.
The maximum response from effector cells takes about two weeks after the first time the body has been exposed to an antigen.
Memory cells divide to produce effector cells when they are exposed to their specific antigen.

Answers

Answer:

The answer is: Clonal selection produces memory cells that are long-lived and can recognize the antigen in the future.

Explanation:

Two noncellular agents, smaller than viruses, are infectious RNA strands called ___ and infectious proteins called ___. prions; viroids prions; phages viroids; phages viriods; prions prions; capsomeres

Answers

Answer:

A. prions; viroids

Explanation:

Match each step of the scientific method on the left with the statement it describes on the right

(5,6 and 7)

Answers

Answer:

6 and 7

Explanation:

I don't know I need points

g. What is the function of CU? ​

Answers

Answer:

to give education ,to make all the people educated ,to make society good

The control unit (CU) is a component of a computer's central processing unit (CPU) that directs operation of the processor. It tells the computer's memory, arithmetic/logic unit and input and output devices how to respond to a program's instructions

they overcame by the blood of the lamb and the word of their testimony

Answers

Answer:

Revelation 12:11

16. Which organelle may have allowed early eukaryotes to make food and produce oxygen? (a) the Golgi apparatus (b) the central vacuole (c) the plastids

Answers

Answer:

the plastids

Explanation:

Answer:  

The plastids are the organelles that compose the cells of plants and algae. These contain chloroplasts, which allow them to capture energy from sunlight. If they are ever removed, these cells will eventually lose their ability to photosynthesize food without help from another organism - they have lost an essential organelle. Without the presence of this organelle, eukaryotes may not have been able to use sunlight as a mechanism for producing oxygen or making nutrients such as glucose available for consumption.

The organelle that may have allowed early eukaryotes to make food and produce oxygen is the plastid. The correct option is c.

What is plastid?

The organelles that make up the cells of plants and algae are called plastids. These have chloroplasts, which enable them to absorb solar energy. These frequently include several kinds of pigments that can alter the color of the cell as well as pigments that are employed in photosynthesis.

These cells will eventually lose their capacity to photosynthesize food without the assistance of another creature if they are ever taken out since they have lost an important organelle.

Eukaryotes might not have been able to exploit sunlight to produce oxygen or make nutrients like glucose available for consumption without the presence of this organelle.

Therefore, the correct option is (c) the plastids.

To learn more about plastid, refer to the link:

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mention any 2effect of drug substance​

Answers

Nausea and Abdominal Pain

Secretory IgA is best described as _____.
A. an opsonizing antibody that facilitates uptake by M cells through Fc receptors
B. a monomeric IgA that neutralizes antigen effectively at mucosal surfaces
C. an inflammatory immunoglobulin that stimulates the chemotaxis of neutrophils into mucosal surfaces
D. a complement-activating immunoglobulin that causes destruction of invasive microflora through the membrane-attack complex
E. a non-inflammatory immunoglobulin that restricts the passage of antigens across mucosal surfaces

Answers

Answer:

d.

Explanation:

...

A study is conducted to evaluate the effect of competition between foxes and coyotes for a limited food source. Which level of ecology is being studied

Answers

Answer:

Community ecology!

Explanation:

I’m just did this assignment and got it right <3

A study is conducted to evaluate the effect of competition between foxes and coyotes for a limited food source. The level of ecology being studied is community ecology. The correct option is d.

What is community ecology?

The ecosystem is the fundamental unit for maintaining life, although it extends beyond species living in a single location. The recycling of resources between organisms and their environments, between organic and inorganic forms, is essential to life.

Community ecology is the study of the structure and function of communities, which are assemblages of interacting populations of species living in a certain area or habitat.

A community in ecology is a group or association of populations of two or more different species that live in the same geographical area and at the same time, also known as a biogenesis.

Therefore, the correct option is d, community ecology.

To learn more about community ecology, refer to the link:

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The question is incomplete. Your most probably complete question is given below:

molecular ecology

organismal ecology

population ecology

community ecology

Describe the following features of processes evaluation leaching zone of accumulation and hardpan. PLEASE HELP ME ITS DUE IN 10 MINS. NO LINKS!!!

Answers

Explanation:

As soils mature, they develop soil horizons as organic matter accumulates and mineral weathering and leaching take place.

Along one side of a DNA molecule, the nucleotides are connected to each other by ________ bounds between _______

Answers

Answer:

Nucleotides are joined together by covalent bonds between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar in the next nucleotide.

Explanation:

Along one side of a DNA molecule, the nucleotides are connected to each other by covalent bonds between the phosphate group pf one nucleotide and the third carbon atom of the pentose sugar (deoxyribose sugar) in the next nucleotide.

How nucleotides are arranged in DNA?

Two nucleotides are attached via a phosphodiester bond to form dinucleotide. Another  nucleotides are added in same manner to form polynucleotide chain.

In this polynucleotide chain, the nucleotides are connected to each other by covalent bonds between phosphate group of one nucleotide and third carbon atom of deoxyribose sugar and forms a phosphate backbone of DNA.

To know more about DNA :

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Which type of animal have thick skin and long Eyelashes?​

Answers

Answer:

Camel

Explanation:

Where are materials stored in single celled organisms?

Answers

Answer: Ribosomes most of the time.

Explanation:

when oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Answers

Answer:

anerobic resperation

Explanation:

PLEASE HELP ME IM TIMED!

Answers

Answer:

#3 Proteins

Explanation:

"There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON)."

The correct answer is carbohydrates

Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a white offspring in a cross: Bb x bb. ​

Answers

Answer:

50%

Explanation:

the probability of white offspring is fifty percent

The concentration of sodium on the inside of the cell is 20 mM. The outside of the cell has a sodium concentration of 115 mM. Which mechanism of ion uptake would best move sodium from the inside of the cell to the outside? osmosis diffusion passive transport active transport.

Answers

Answer:

It's active transport

Explanation:

The mechanism of ion uptake that would best move sodium from the inside of the cell to the outside is active transport.

What do you mean by Ion uptake?

Ion uptake may be defined as the process of movement of ions from one side of the membrane to the other.

Active transport helps in the movement of ions against the concentration gradient. It also requires energy. The active transport of small molecules or ions across a cell membrane is generally carried out by transport proteins that are found in the membrane.

Therefore, the mechanism of ion uptake that would best move sodium from the inside of the cell to the outside is active transport.

To learn more about Active transport, refer to the link:

https://brainly.com/question/25832845

PLEASE HELP!


A. What kind of weather is associated with a low-pressure area?


B. What happens to the air of the low pressure areas that leads to this type of weather?

Answers

Answer:

clouds and precipitation that minimize temperature changes throughout the day

Explanation:

I just took the test and got an A on it

17
Describe how temperatures above 35 °C most likely affect the structure
and function (be specific!) of starch synthase in the particular strain.

Answers

Starch synthase has an optimum temperature of 35°c. If we differ from the optimum temperature, the enzyme’s active site will start to denature, distorting it’s structure. As a result, it will not be able to catalyse the synthesis of compounds in the body.

The purpose of the foot of a molluscs is:

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Answer:

Foot of a molluscs is used for locomotion and anchorage, and varies in shape and function, depending on the type of mollusk under study.

Group of different tissues working together to do a job

Answers

Answer:

organ

Explanation:

cell tissue organ organ system organism

The answer is an organ

QUESTION 8
A cell has 14 chromosomes. How many chromosomes will it have after it undergoes cytokinesis in mitosis?
OA) 7
B) 28
OC) 14
D)2
E) none

Answers

Answer:

C) 14

Explanation:

There would be 2 daughter cells, but each would have 14 chromosomes

The picture shows a model of a cell.

Answers

Answer:

What is showing is called a Chloroplast. They help the plant capture sunlight energy. So 'B' is the answer.

Explanation:

Answer:

B's your answer.To use energy from sunlight to make sugars

4. According to the data in Tables, which planet in the solar system has the greatest​

Answers

what table?

Explanation:

Bengai tigers the population has decreased in india because of what

Answers

Answer:

destruction of forests

Explanation:Unfortunately, this resulted in the loss of most of the Bengal Tigers habitat. Because of the destruction of forests, where tigers live, the Tiger population decreased dramatically. The new habitat space for tigers was scattered and very small. Many tigers died because they didn't have anywhere they could sustain to live.

more science for you guys to help me with lolz

Answers

Answer:

Hi. Good evening.

Explanation:

The part labelled A is the cell membrane and the correct option to choose is the first one.

It serves as a passage to remove metabolic wastes in both cell X and cell Y.

Hope I'm right. Please remember brainliest.

help or no branlest :(​

Answers

Answer:

B is the correct answer

Explanation:

The skeletal and muscular system  was designed to support our body's structure. Therefor making it the best fit answer.

Answer:

Skeletal and muscular systems

Explanation:

.

Joanna was chewing gum and talking to her friend when suddenly she swallowed her gum. Which phase of swallowing was most likely involved in the accidental swallowing of her gum

Answers

The phase of swallowing that was most likely involved in the accidental swallowing of her gum is the pharyngeal phase.

There are different phases of swallowing is divided into three, namely:

oral phase

pharyngeal phase and

esophageal phase

The oral phase is voluntary while the pharyngeal and the esophageal phase is involuntary.

The pharyngeal phase involves the movement of the bolus of food from the oropharynx into the esophagus.

Since the Joanna accidentally swallowed her gum, it is an involuntary action of the pharyngeal phase of swallowing.

Learn more here:

https://brainly.com/question/13020441

What must happen to a chromosome for it to become chromatin?

Answers

Answer:

Chromatin condensation begins during prophase (2) and chromosomes become visible. Chromosomes remain condensed throughout the various stages of mitosis (2-5). ... However, when eukaryotic cells are not dividing — a stage called interphase — the chromatin within their chromosomes is less tightly packed.

Explanation:

The chromosomes will decondense in telophase back into chromatin
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