1. Which of the following compounds in the main group is an alkaline earth metal?
O A. Sodium
O B. Calcium
C. Silicon
O D. Xenon
Answer:
B. Calcium
Explanation: short answer
Answer:
Calcium
Explanation:
Prepare a collage of tools and equipment used in production of any one agricultural crop, from seed or planting through packaging of the produce
Answer:
i think
Explanation:
Describe the structure and function of the following organelles: nucleus, endoplasmic reticulum, Golgi body, mitochondria, lysosomes, ribosomes, and centrioles
Answer: A cell organelle is defined as a cellular structure which has a specific function. The structure and function of these organelles as explained below.
Explanation:
--> NUCLEUS: This is the largest and most important cell organelle. It is enclosed by a double- layered nuclear membrane with many pores. The structure of the Nucleus makes it the 'control center' of the cell. This, it contains genetic materials( chromosomes) which controls the Production of a new cell or the whole organism itself and it controls the type and quantity of proteins( enzymes) produced in the cytoplasm.
--> ENDOPLASMIC RETICULUM(ER): this is a system of membrane-lined sacs that form channels throughout the cytoplasm. It's membrane is continuous with the nuclear membrane. There are two types of endoplasmic reticulum: rough and smooth. The rough ER packs and transports proteins made by ribosome while the smooth ER is involved in lipid and steroid synthesis.
--> GOLGI BODY: This is a stack of membrane-lined sacs. It is continuously formed at one end and broken off as bubbles or vesicles at the other end. These vesicles carry 'export materials' like enzymes and hormones which the cell makes.
--> MITOCHONDRIA: This is a sausage-shaped body surrounded by a double-membrane layer. The inner membrane is folded to form partitions which project into the inside of the mitochondria. The energy producing reactions of cellular respiration take place in the mitochondria. It is thus often called the cell's 'power- house'.
LYSOSOMES: These are small round sacs that contains digestive enzymes which break down structures and substances. They are also involved in the transport of materials in and out of the cell.
RIBOSOME: These are found on the surface of rough endoplasmic reticulum and are sites for protein synthesis of the cell.
CENTRIOLE: Two rod-like centrioles are found at right angles to each other in an animal cell. They are found near the nucleus and seem to be concerned with cell division.
In which season(s) are the most populations limited in Mono Lake?
Answer:
Mainly winter i think
Explanation:
Which organism is an example of a producer?
moth
mushroom
rose bush
cheetah
Answer
Rose Bush
Explanation:
Rose bush is an example of a producer. Therefore, the correct statement is option C.
What are producers?Producers are organisms that produce their own food through photosynthesis and form the base of the food chain by providing food for all other organisms in the ecosystem. For example, plants, algae, and some bacteria are few examples of producers.
The rose bush is a producer belonging to the kingdom Plantae and can produce its own food through photosynthesis where it converts light energy into chemical energy. The rose bush also contains specialized structures called chloroplasts to carry out photosynthesis.
Moths and cheetahs cannot produce their own food. Moths, on the other hand, are insects belonging to the class Lepidoptera and feed on plants or other insects and mushrooms obtain their nutrients from dead organic matter and are decomposers which play an important role in breaking down organic matter in the ecosystem.
Therefore, rose bush is an example of a producer.
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state two functions of blood plasma
Answer:
"The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it. Cells also put their waste products into the plasma."
……………,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Answer:
these r so many which one?
Explanation:
Which characteristic is unique to vertebrates?
A) they all have a well-defined skeleton
B) they have no defined organ systems
C) they have bilateral symmetry
D) they have an exoskeleton
Answer: They have well-defined skeleton.
Explanation:
This is because the vertebrates are uniquely characterised by the presence of the bones.
Answer:
Answer is A)They have a well-defined skeleton
Explanation:
most reasonable answer
Which model best describes how gravity causes star formation?
Answer:
The choice b
Explanation:
took the test
II. NAMEM
Direction: Identify the word that best describes the following statement. Write your answer on
the space provided.
Ribonucleic Acid
1. These are molecules that code for hereditary traits by controlling the
production of protein.
2. These are carbohydrates that serves as a storing energy and are also
found in hormones and cell membrane components.
3. These are lipids which molecules are composed of fused rings of atoms
4. These are formed when two amino acids react with each other in an
acid-based reaction.
5. A nucleic acid that contains the genetic instructions used in the
development and functioning of all modern living organisms.
6. It transfers genetic code needed for the creation of proteins from the
nucleus to the ribosome or the protein synthesis.
7. It is the simplest sugar and the basic sub-unit of a carbohydrate.
8. This is the chief storage form of carbohydrates in plants and the most
important source of carbohydrates in human nutrition.
9. These are compounds with the same molecular formulas.
10. These are organic compounds formed by green plants from carbon
dioxide and water during the process of photosynthesis.
Starch
Peptide
Carbohydrates
Deoxyribonucleic acid
Isomers
Lipids
Monosaccharides
Nucleic Acid
Steroids
Ribonucleic Acid
Answer:
1. nucleic acids - these are the molecules also known as genetic material and code for the hereditary characteristics by regulating the production of the proteins.
2. Lipids - Lipids are the hydrocarbon and the major constituents of the cell membrane and molecules like hormones and give energy as well.
3. steroids - Steroids are lipids that have a fused ring structure and do not resembles other lipids however, have the same hydrophobic nature.
4. peptide - when two amino acids react with one another in an acid-base reaction there is a peptide bond form and the new molecule is called peptide and chains of such molecules known as polypeptides.
5. Deoxyribonucleic acid or DNA - It has genetic information code in it as specific sequences, it is used to develop and functions of various living organisms.
6. Ribonucleic acid or RNA - RNA is the molecule that play important role in protein synthesis as it (mRNA) carries the genetic code needed for the creation of proteins to the ribosomes from the nucleus.
7. Monosaccharides - Monosaccharides are the simplest form of Carbohydrates and known as a basic subunit of carbohydrates as these are linked to form complex carbohydrate molecules.
8. Starch - Starch is a carbohydrate found mainly in plants as the storage form of carbohydrates and provides nutrition to various organisms including humans.
9. Isomers - are the ompounds that have the same molecular formula but different chemical structures are called isomers.
10. Carbohydrates - it is the organic molecule and major source of nutrition that is produced by green plants from carbon dioxide and water through the process of photosynthesis.
When talking about members of a
particular species, which of the
following makes the biggest
difference in the survival of an
organism in their environment?
A. external traits that we can see
B. internal traits that we cannot see
C. the eye color of the organism
D. the flower color of the organism
Answer:
either a or b
Explanation:
definitely not c or d.
What is a plant nucleus
Answer:
All plant cells contain a nucleus, a structure that stores DNA and acts as a cell's command center. It is surrounded by the nuclear envelope and is filled with nucleoplasm. ... DNA is copied during DNA replication for new cells, as well as copied to RNA to make proteins in the nucleus.
A farmer tested the soil in a field and found that there was a high nitrate salt concentration. The farmer then grew a crop in this field. After the crop was removed, the soil was tested again.
The nitrate salt concentration had decreased.
(a) Suggest reasons why the nitrate salt concentration had decreased
(b) Some species of plant grow well in soil that is always low in nitrate salt. Explain how
they can obtain a source of nitrogen compounds.
Answer:
The soil salt geted decereased because the plants in field absorbed salt from soil.The photograph shows soil layers. What is the bottom layer of soil?
Answer:
bed rock
Explanation:
ok ok ok ok ok ok ok ok ok ok ok
If a DNA sample were composed of 15% adenine, what would be the percentage of thymine?
a. 15.
b. 30.
c. 35.
d. 50.
Answer:
C: 35
Explanation:
if DNA molecule contains 15% adenine then C and G will constitute 70%,of which guanine will be 35%
A species of wasp dies out in a prairie ecosystem. This species used to perform the important task of pollinating a widespread plant species. This ecosystem will be less damaged by this local extinction if
Answer:
C.
there are other insect species that also pollinate the plant.
Explanation:
Why earth is warmer at the equator?
Answer:
Why is it hotter at the equator than it is at the poles? ... Because the sun's rays hit the earth's surface at a higher angle at the equator.
Please help asap
Write the name of each structure on the lines below indicated by a letter in the image above. a. _______________________ b. _______________________ c. _______________________ d. _______________________
Answer:
The correct answer is -
A. axon
B. dendrite
C. neurotransmitter
D. Synapse
Explanation:
The given diagram is the representation of two neurons connected by the chemical signal. Each neuron has a nerve fiber that carries the nerve signal from one neuron to another covered with sheath, this body is called Axon.
Axon is connected with dendrite, which receives a signal from other neurons and is arise from the cell body of neurons in various numbers. The site where two neurons meet called synapse which is releases neurotransmitters a chemical signal molecule.
Is it necessary to sustain Earth's resources?why?
Answer:
earth is the only planet we know of that sustain life please mark me brain list
information of vertebrates mammal
Answer:
A vertebrate is an animal with a spinal cord surrounded by cartilage or bone. The word comes from vertebrae, the bones that make up the spine. Animals that are not vertebrates are called invertebrates. Vertebrates are adapted to life underground, on the surface, and in the air. They feed upon plants, invertebrate animals, and one another. Vertebrate faunas are important to humans for food and recreation.Vertebrate Classes
Agnatha (Jawless Fish) Aves (Birds) Amphibia (Amphibians) Chondrichthyes (Rays, Sharks, Skates) Mammalia (Mammals) Osteichthyes (Bony Fish) Reptilia (Reptiles)
Explanation:
1. Which of the following reproduce using spores?
wild flowers
pine tress
vegetable plants
mosses and ferns
PLEASE HELP MEEE
ASAP
URGENT
Answer:
pine trees
Explanation:
pine trees grow in cold areas where seed cannot be placed in flowers or fruits. hence they are placed in pine cones which protect the seed from cold and harsh weathers
Answer:
Mosses and Ferns
I did the test and this was the answer, hope this helps
A chemical interferes with a cell's ability to make proteins. Investigations reveal that the cell parts responsible for making proteins are in working order. The cell can also
encode instructions for making proteins, but those instructions are not being carried out. The chemical appears to affect the communication between the
A Cell wall and Nucleus
B Nucleus and Ribosomes
C Mitochondria and Chloroplasts
D. Endoplasmic reticulum and Lysosomes
Answer:
I
Explanation:
what is cyclin dependent kinase?
Answer:
please mark as brainliest answer as it will also give you 3 points
Explanation:
Cyclin-dependent kinases (CDKs) are the families of protein kinases first discovered for their role in regulating the cell cycle. They are also involved in regulating transcription, mRNA processing, and the differentiation of nerve cells.[1] They are present in all known eukaryotes, and their regulatory function in the cell cycle has been evolutionarily conserved. In fact, yeast cells can proliferate normally when their CDK gene has been replaced with the homologous human gene.[1][2] CDKs are relatively small proteins, with molecular weights ranging from 34 to 40 kDa, and contain little more than the kinase domain.[1] By definition, a CDK binds a regulatory protein called a cyclin. Without cyclin, CDK has little kinase activity; only the cyclin-CDK complex is an active kinase but its activity can be typically further modulated by phosphorylation and other binding proteins, like p27. CDKs phosphorylate their substrates on serines and threonines, so they are serine-threonine kinases.[1] The consensus sequence for the phosphorylation site in the amino acid sequence of a CDK substrate is [S/T*]PX[K/R], where S/T* is the phosphorylated serine or threonine, P is proline, X is any amino acid, K is lysine, and R is arginine.[1]
Match the names of the microscope parts in column A with the descriptions in column B. Place the letter of your choice in the space provided.
Column A Column B
a. Adjustment knob (coarse) _______ 1. Increases or decreases the light intensity
b. Arm _______ 2. Platform that supports a microscope slide
c. Condenser _______ 3. Concentrates light onto the specimen
d. Eyepiece (ocular) _______ 4. Causes stage (or objective lens) to move upward or downward
e. Field of view _______ 5. After light passes through the specimen, it next enters this lens system
f. Iris diaphragm _______ 6. Holds a microscope slide in position
g. Nosepiece _______ 7. Contains a lens at the top of the body tube
h. Objective lens system _______ 8. Serves as a handle for carrying the microscope
i. Stage _______ 9. Part to which the objective lenses are attached
j. Stage (slide) clip _______ 10. Circular area seen through the eyepiece
Answer:
Adjustment knob (coarse) ---> Causes stage (or objective lens) to move upward or downward
Arm ---> Serves as a handle for carrying the microscope
Condenser ---> Concentrates light onto the specimen
Eyepiece (ocular) ---> Contains a lens at the top of the body tube
Field of view ---> Circular area seen through the eyepiece
Iris diaphragm ---> Increases or decreases the light intensity
Nosepiece ---> Part to which the objective lenses are attached
Objective lens system ---> After light passes through the specimen, it next enters this lens system
Explanation:
The microscope is an essential equipment used in science laboratories to view objects which are too small to be seen by the naked eye. Also certain processes which occur at the microscopic level can only be observed using a microscope.
There are many different types of microscopes. The compound light microscope is the one most commonly used in biological laboratories to view tissues and cells of organisms. It uses visible light which passes through two separate lens to magnify the image produced of a specimen.
The various parts of compound light microscope and their respective functions are given below:
Adjustment knob (coarse) ---> Causes stage (or objective lens) to move upward or downward
Arm ---> Serves as a handle for carrying the microscope
Condenser ---> Concentrates light onto the specimen
Eyepiece (ocular) ---> Contains a lens at the top of the body tube
Field of view ---> Circular area seen through the eyepiece
Iris diaphragm ---> Increases or decreases the light intensity
Nosepiece ---> Part to which the objective lenses are attached
Objective lens system ---> After light passes through the specimen, it next enters this lens system
Stage ---> Platform that supports a microscope slide
Stage (slide) clip ---> Holds a microscope slide in position
The correct match between microscope parts and names are:
A. adjustment knob (coarse) - 4.
B. Arm - 8.
C. Condenser - 3.
D. eyepiece (ocular) - 7.
E. Field of view - 10
F. Iris Diaphragm - 1
G. Nosepiece - 9
H. objective lens system - 5
I. Stage - 2
The microscope is an important piece of equipment used in biological science that helps in view objects that can not be seen by the naked eye. It is also used in various branches of science used to see certain processes that occur at the microscopic level.
A. adjustment knob (coarse) - Causes stage or objective lens to move up or down B. Arm - Serves as a handle for carrying the microscopeC. Condenser - focus or concentrates light onto the specimenD. eyepiece (ocular) - Contains a lens at the top of the body tubeE. Field of view - Circular area can be seen through the eyepieceF. Iris Diaphragm - helps to Increases or decreases the light intensityG. Nosepiece - Part to which the objective lenses are attachedH. objective lens system - After light passes through the specimen, it next enters this lens systemI. Stage - Platform that supports a microscope slideLearn more about microscopes:
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What is a mutation?
A. The visual appearance of an organism
B. A damaged protein
C. A permanent change in DNA or RNA
D. A harmful change to an organism's phenotype
Answer:d
Explanation:
it’s right
The wavy vertical arrows represent water's introduction into which of Earth's systems?
a.atmosphere
b.biosphere
c.geosphere
d.hydrosphere
Answer:
B Biosphere is the system in which the arrows represent waters intro.
Some microorganisms cause human disease. Other microorganisms are used in making cheese, yogurt, and bread. Based on this information, the relationship between humans and microorganisms can be
A) beneficial, only
B) harmful, only
C) beneficial or harmful
Is this right i’m confused?
One statement is an example of a scientific observation. Another statement is an example of a scientific explanation. Identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.
Cloning has the potential to
significantly benefit a great many
people, so it should not be
considered immoral or risky.
A scientist thinks that he might
find serious inconsistencies in the
fossil record if he conducts an
excavation in a new location.
The rocks present in western Africa
and eastern South America formed
at the same place and at the
same time.
Even if modern organisms are
found in ancient portions of the
fossil record, this wouldn't challenge
the theory of evolution in any way.
The cloning of organisms is an
exciting area of study, and more
resources should be be devoted
to it.
The age, type, and composition of
ancient rocks in western Africa are
nearly identical to the age, type,
and composition of rocks in
eastern South America.
Answer:
2, 4, and 5 refers to scientific revolution while on the other hand, the remaining statements shows scientific observation.
Explanation:
Cloning has the potential to significantly benefit a great many people, so it should not be considered immoral or risky is refers as scientific observation.
A scientist thinks that he might find serious inconsistencies in the fossil record if he conducts an excavation in a new location is refers scientific explanation because explanation is needed for it which can drawn from the scientific observation.
The rocks present in western Africa and eastern South America formed at the same place and at the same time is scientific observation because the scientists takes the data.
Even if modern organisms are found in ancient portions of the fossil record, this wouldn't challenge the theory of evolution in any way is refers to scientific explanation.
The cloning of organisms is an exciting area of study, and more resources should be be devoted to it so it is refers as scientific explanation.
The age, type, and composition of ancient rocks in western Africa are nearly identical to the age, type, and composition of rocks in eastern South America is scientific observation which is taken by the scientist through research.
Andy is sitting on the sofa, quietly reading a book. Which of the following is most likely supplying the majority of his energy right now?
a. amino acids
b. ice cream
c. polypeptides
d. fats.
e. cholesterol
f. glycogen