Answer:
genetic traits to exist in a gene pool
Explanation:
Adaptation through natural selection is limited because it requires that the genetic traits must have existed in the gene pool.
Natural selection only acts on the existing gene pool and selects for adaptive genes, not that it creates new genes. Hence, for a population to be able to adapt to a particular change in the environment, the adaptive genes must have been present in the gene pool of the population. This, thus, makes adaptation through natural selection to be limited.
what is the role of producers in a food web?
The plasma membrane is like the _______ of the cell.
Select one: a. face b. voice c. heart d. skin
im confused on this worksheet. can somebody help me?
Answer:
All of it?!
Explanation:
1. Who was Henrietta Lacks? What type of disease did she die from? How long ago did she die?
Answer:
Henrietta Lacks (born Loretta Pleasant; August 1, 1920 – October 4, 1951) was an African-American woman whose cancer cells are the source of the HeLa cell line, the first immortalized human cell line and one of the most important cell lines in medical research. An immortalized cell line reproduces indefinitely under specific conditions, and the HeLa cell line continues to be a source of invaluable medical data to the present day.
Remember that HeLa cells were grown from a tissue sample from Lacks' cervical tumor. Cancerous cells don't experience PCD, and Lacks' particular cells were especially hardy. Just like the cancer grew and spread quickly through Lacks' body, HeLa cells grow and spread quickly in vitro.
Date of death: October 4, 1951
Place of death: The Johns Hopkins Hospital, Baltimore, MD
Answer: Henrietta Lacks was an African-American woman. Her cancer cells created the HeLa cell line (most scientists call her HeLa) and that cell line was the first immortalized human cell line. She died from cervical cancer in 1951, 69 years ago.
Sickle cell anemia is a genetic disorder caused by recessive alleles that can cause hemoglobin molecules to
stick together. The gene for normal hemoglobin is dominant. If a hybrid man and a heterozygous woman have
a child, what is the chance that their child will have sickle cell anemia?
100%
25%
50%
0%
GREETINGS!
The sickle cell anemia allele is autosomal, meaning it can be found on one of the other 22 pairs of chromosomes, but not on the X or Y chromosome.
Hybrid trait is a heterozygous trait i.e. pair of dominant and recessive allele so that means they both man and woman are carriers, so when both the parents CARRIERS there are 25 % for children to be affected by this disorder
WHAT ARE ALL SCENERIOS FOR SICKLE CELL ANEMIA?
Scenario 1. Neither parent has the recessive sickle cell allele. None of their children will have sickle cell anemia or be carriers of the recessive allele.
Scenario 2. One parent is a carrier while the other isn’t. None of their children will have sickle cell anemia. But there’s a 50 percent chance that children will be carriers.
Scenario 3. Both parents are carriers. There’s a 25 percent chance that their children will receive two recessive alleles, causing sickle cell anemia. There’s also a 50 percent chance that they will be a carrier. Lastly, there’s also a 25 percent chance that their children won’t carry the allele at all.
Scenario 4. One parent isn’t a carrier, but the other has sickle cell anemia. None of their children will have sickle cell anemia, but they’ll all be carriers.
Scenario 5. One parent is a carrier and the other has sickle cell anemia. There’s a 50 percent chance that children will have sickle cell anemia and a 50 percent chance they’ll be carriers.
Scenario 6. Both parents have sickle cell anemia. All of their children will have sickle cell anemia.
I HAVE MENTIONED ALL THE SCENERIOS POSSIBLE IN SICKLE CELL
HOPE THIS HELPS YOU!
Lactase breaks down a sugar found in dairy products known as lactose. Some people are lactose intolerant, and this can be due to not having enough lactase production. People who are lactose intolerant may not feel well after eating foods containing lactose.
Answer:
enzyme: Lactase
substrate: Lactose
Explanation:
Identify the enzyme: Enzymes are the proteins that accelerate the rate of reaction. Enzymes are identified with the suffix - ase along with the name of the substrate. So, in the given example: the enzyme is Lactase.
Identify substrate: The substrate is defined as the molecule on which an enzyme acts. The enzyme binds with the substrate through its active site and accelerates the reaction. So, in the given example, Lactose is a substrate on which the enzyme lactase acts.
Relationship between the substrate and enzyme: When an enzyme binds its substrate, it forms an enzyme-substrate complex. The enzyme consists of an active site at which substrate binds to the enzyme and substrate causes a conformational change to enzyme resulting in enzyme-substrate complex.
9. What are some similarities and differences in how the five teenagers have
been affected by the coronavirus? *
Answer:
there's are different ways breathe or not talk smell or touch ur eyes
Please help will mark as brainliest
Answer:
It helps increase food for Aboriginal people by promoting the growth of bush potatoes and edible ground-level plants.
Explanation:
What is the general shape of a planet's orbit around the Sun?
Answer:
the earths orbit is not a circle the orbit is more or less like an egg, mercury has an egg shape to, Venuses orbit is more of a perfect circle,Marses orbit is slanted 25 degreas, u get the idea every planet orbits the sun diffrently
Explanation:
True or False? Conduction works in liquids and gases.
Answer: conduction takes place in liquids but not gases
Explanation:
Hope this helped :)
Answer:
true- Conduction works in both
Explanation:
the dum dum before me is wrong
What are grana?
please help :)
Answer:
Please Mark as Brainliest. Please!!!!!!!
Explanation:
What are Grana?
We all need photosynthesis. All of us living on Earth's surface, that is. Turning light into food energy is the foundation of almost all food chains on Earth and is the livelihood of plants and algae. These organisms house chloroplasts within their cells, organelles responsible for manufacturing energy through the process of photosynthesis. It is within chloroplasts that we find many grana.
Grana (plural of 'granum') are stacks of structures called thylakoids, which are little disks of membrane on which the light-dependent reactions of photosynthesis take place. Stacked into grana, the shape of the thylakoids allow for optimum surface area, maximizing the amount of photosynthesis that can happen.
Within the chloroplast the grana resemble stacks of green pancakes, and are not uniform in their height or distribution. The grana are connected to each other by way of lamellae, or membrane that bridge the grana but also participate in the photosystem 1 stage of photosynthesis. All parts within the chloroplast are surrounded by a liquid suspension called stroma.
What advantage does the white-faced marmoset gain by its method of reproduction?
a) The marmoset population has genetic variation.
b) The marmoset can reproduce without a male.
c) The marmoset can reproduce many offspring at a time.
d) The marmoset can reproduce by budding.
HELPPPP
can genetic mutations benefit an organism?
Answer:
Yes
Explanation:
Benefical mutations (mutations that help or benefit an organism) are very important to evolution! They increase an organisms survival or reproduction rates, leading the mutations to spread among the species.
Have a good day :D
Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below.
Answer:student 2
Explanation:
A team of scientists think they discovered a new organism while exploring Brazil. Upon bringing the specimen back to their lab in Atlanta, they observe the specimen for several weeks. They take a sample from the specimen to observe it under a microscope and see the sample is composed of many small compartments containing what appears to be nuclei. They shine a bright light to the left of the specimen and observe it slowly turn itself towards the light over multiple days. What further evidence would support that the newly discovered specimen is alive?
Answer:
Explanation:
Response of the organism to chemicals
when some particular chemicals are spilled when they are alive they have the ability to detect it so they either move away or closer to it. Moving further away signifies that life is in the organism and that the chemical maybe toxic to it health., some bacteria respond to chemicals
Response to touch, when there is life the organism will likely respond to touch, it can move away from the place trying to find another place to hid or stay.
which cell cycle does cyclin production begin
Answer:
it begins on the cell cycle
Explanation:
Accordingly, cells synthesize G1- and G1/S-cyclins at different times during the G1 phase, and they produce M-cyclin molecules during the G2 phase. Cyclin degradation is equally important for progression through the cell cycle.
hope this helps :)
-by chance may i get brainliest
WILL GIVE BRAINLIEST!!!!!!
A functional group is a specific group of bonded atoms that always has the same chemical properties and always reacts in the same way.
True
False
Which of the following is a field of nonbiological science that contributes knowledge and techniques to biotechnology *
A. Nanotechnology
B. Cell Biology
C. Biochemistry
D. Bioengineering
What are riparian buffers?
Answer: A riparian buffer or stream buffer is a vegetated area near a stream, usually forested, which helps shade and partially protect the stream from the impact of adjacent land uses. It plays a key role in increasing water quality in associated streams, rivers, and lakes, thus providing environmental benefits.
Explanation: Have a blessed day! Hopefully this helped!
Answer: Riparian buffers are the natural vegetation from the edge of a stream bank out through the riparian zone. The vegetative zone serves as a buffer to pollutants entering a stream from runoff, controls erosion, and provides habitat and nutrient input into the stream.
Explanation:
How are gems and precious metals similar?
They are both very common minerals.
They are both easily bent and shaped.
They both have metallic lusters.
They are both rare, valuable minerals
Answer:
D. they are both rare, and valuable minerals.
Be able to apply analogus relationship to
the structure function of organelles
Name 4 effects that European colonization has had on African countries.
Answer:
On the African continent the Europeans seized land from the Africans to establish plantations for the growing of cash crops and forced the people to work on these plantations for a meagre. The African culture was diluted, traditions were taken away and their ways of life were destroyed
Explanation: they took over traditions and there culture was diluted and it destr there way of life
Which statement BEST summarizes the information presented in this map?
A)
Many nations refuse to trade with the United States.
B)
The value of US exports exceeds the value of imports.
C)
The U.S. has free trade agreements with many foreign nations.
D)
Europe is the most important participant in free trade with the U.S.
Answer:
C)
The U.S. has free trade agreements with many foreign nations.
Explanation:
According to the information presented in this map, the U.S. has free trade agreements with many foreign nations. These free trade agreements eliminate tariffs, quotas and preferences on most goods and services traded between the nations.
This map shows that the U.S. has several free trade agreements. Most products and services transferred between countries are tariff-free under these free trade agreements. Therefore, option (C) is correct.
What is a trade agreement?An agreement between two or more countries on certain obligations that affect trade in goods and services, as well as protections for investors and intellectual property rights, among other topics, is referred to as a Free Trade Agreement, or FTA. This type of agreement can involve any number of countries.
According to the data that is shown in this map, the United States of America has free trade agreements with a great number of different countries throughout the world. Because of these free trade agreements, tariffs, quotas, and favouritism are removed from the majority of the commodities and services that are exchanged between the countries.
Learn more about trade agreement, here:
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can someone give me 4 similarities between mitosis and meiosis
Answer:
Both mitosis and meiosis are multistage processes. The stages are interphase, prophase, metaphase, anaphase and telophase. The same general processes occur in each of these stages for mitosis and meiosis. Interphase is cell growth and DNA replication in preparation for cell division.
Explanation:
Answer:
The answer is listed below...
Explanation:
Mitosis and Meiosis are two completely different terms but could be alike in a way. Both Mitosis and Meiosis are involved in the duplication of a cell's DNA content. A common goal of mitosis and meiosis is to split the nucleus and its DNA content between two daughter cells, although the meiosis stage is longer. Each strand of a chromosome is replicated, resulting in two sister chromatids for each chromosome. Both mitosis and meiosis produce fresh new cells based on their parent cells' genes.
Need some differences?
Mitosis is the method by which cells split in half to produce two new cells, identical to the parent cell. Meiosis is a special type of cell division that applies only to sex cells. Mitosis produces two cells from one parent using one division event. But meiosis produces four new child cells with two divisions, each of which has half the genetic material of its parent.
Which one looks like budding??? Please help
A certain food web is made up of flowers, snakes, birds, and honey bees. Which organism is most likely the producer in this food web?
Birds
Honey bees
Flowers
Snakes
Answer: Flowers
Explanation: Producers, also known as autotrophs, make their own food. They make up the first level of every food chain. Autotrophs are usually plants or one-celled organisms.
Answer:F L O W E R S
Explanation:
yes
Which statements concerning the characteristics of water are correct? Choose all that apply.
A Water releases heat when it evaporates
B The solid form of water floats in the liquid form of water
C Water is a nonpolar substances
D Water is cohesive and adhesive allowing for hydrogen bonding
E The pH of pure water is 8
Answer:
water in non-polar
Explanation:
Explantion:
Nonpolar Covalent Bond. A bond between 2 nonmetal atoms that have the same electronegativity and therefore have equal sharing of the bonding electron pair. Example: In H-H each H atom has an electronegativity value of 2.1, therefore the covalent bond between them is considered nonpolar.
What is the answer? Please help! Need answer quickly!
Answer:
It is D
Explanation:
Will get 60 POINTS!
What stage of mitosis is indicated in the picture below: (Whitefish blastula slide)
A Prophase
B Metaphase
C Interphase
D Anaphase
E Telophase
Answer:
metaphase
Explanation:
i might be wrong
One of the atmospheric layers was created by living things to help keep living things alive. What is that layer?
* exosphere
*tropopause
*ozone
*thermosphere
Answer: Troposphere
Explanation: The Troposphere: The Layer in Which We Live
The lowest layer of the atmosphere, which lies next to the
Earth’s surface, is called the troposphere. The troposphere is also
the densest atmospheric layer. It contains almost 90% of the
atmosphere’s total mass! Almost all of the Earth’s carbon dioxide, water vapor, clouds, air pollution, weather, and life-forms
are in the troposphere. As shown in Figure 4, temperatures vary
greatly in the troposphere. Differences in air temperature and
density cause gases in the troposphere to mix continuously.
Answer: That would be the ozone layer.
I took the test to double check the guy above me, and Ozone seemed to be the answer.
