Answer:
Sperms are differentiated into head, neck, middle piece and tail, and is surrounded by the plasma membrane.
Explanation:
Answer:
Sperms are produced in the testes, male reproductive organ. Ovum is produced in the ovary which is a female reproductive organ. A sperm is segmented into head, neck and tail. Ovum has no such segmentation or similar structure.
Hope it helps
what is theory of to observe the neucles in cheek cells
Answer: The theory of cheek cells is used for the identification of cheek cells.
Explanation:
The cells of cheek do not have cell wall. They have a cell membrane which allows on certain molecules to pass through it. The nucleus is located centrally in the cheek cells and it stores the DNA. It can be stained with the help of the methylene blue reagent. It appears blue in color which can be observed under the microscope. The cheek cells can be isolated from the buccal cavity by using cotton buds and cotton swabs can help in isolating the cells.
Which statement best describes the cell membrane?
Grupo de escolhas da pergunta
A) a two layer barrier of phospholipids, whole hydrophobic heads face toward the water, while their hydrophilic tails face away from the water
B) a two layer barrier of phospholipids, whose hydrophobic heads face away from water, while their hydrophilic heads face towards the water
C) a two layer barrier of phospholipids, whose hydrophilic heads face away from water, while their hydrophobic heads face towards the water
D) a two layer barrier of phospholipids, whole hydrophilic heads face toward the water, while their hydrophobic tails face away from the water
ASAP
Answer:
D
Explanation:
When will a recessive trait be seen
in an organism?
A. when at least one recessive allele is present
B. when there is no recessive allele present
C. when there is no dominant allele present
Answer:
c
Explanation:
What does the DNA need to do before mitosis?
Answer:
A dividing cell must be able to pull the copied chromosomes apart from the original copies, which is how the DNA is evenly divided when one cell splits into two.
Explanation:
The genetic code for one amino acid molecule consists of A) five sugar molecules B) two phosphates C) three nucleotides D) four hydrogen bonds
Answer:
c
Explanation:
The genetic code for one amino acid molecule consists of three nucleotides. Thus option C is correct.
What is genetic code?
Genetic code is defined as a sequence of instructions that directs the translation of DNA into 20 amino acids, which are the basic building blocks of proteins in living cells.
It can also be defined as the collection of instructions that live cells follow to convert information stored in genetic material into proteins.
Nucleotides are defined as a three-subunit chemical molecule consisting of a nitrogenous base, a five-carbon sugar, and a phosphate group.
It can also be defined as the fundamental building component of nucleic acids.
There are basically two types of nucleotides.
Purines - They are defined as a heterocyclic aromatic organic molecule composed of two fused rings. Adenine, guanine and hydro xanthine are purines.Pyrimidine - They are defined as a simple aromatic compounds with a six-membered ring of carbon and nitrogen atoms. Cytosine, thymine and uracil are pyrimidines.Thus, the genetic code for one amino acid molecule consists of three nucleotides. Thus option C is correct.
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Which of the following best explains the comparative anatomy of bird wings and fly wings?
a). homologous structures
b). analogous structures
c). vestigial structured
d). embriological structures
The concentration of carbon dioxide in the atmosphere has been gradually increasing for many years. How might this increase affect photosynthesis? (please answer quickly)
Answer:
It will increase the rate of photosynthesis as there will be more carbon dioxide ... however there may be a limiting factor which will limit the rate to keep it constant... Such as the opening if the stomata to receive more CO2 which in turn causes loss of water by transpiration.
The carbon dioxide concentration in the atmosphere has been gradually increasing. It might increase the plants' photosynthesis, but at the same time, plants are being cut down.
What is photosynthesis?Photosynthesis requires carbon dioxide and water, but day by day the carbon dioxide concentration is increasing with the decline in plant numbers. The carbon dioxide is released due to the burning of fossil fuels and the increase in vehicles, factories, etc. Due to photosynthesis, plants are called "producers of ecosystems."
To make room for these structures such as industries, the forest and plants are cleared. Hence, the increase in carbon dioxide will not increase the rate of photosynthesis in practical. Carbon dioxide is produced by the cellular metabolism of both animals and plants. So day by day, carbon dioxide is increasing in the atmosphere, which is causing global warming. Carbon dioxide obstructs the passage of radiation through the atmosphere.
Hence, an increase in the carbon dioxide concentration increases the photosynthetic rate if plants number increase simultaneously.
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What is the process of water moving from an area of low solute
concentration to an area of high solute concentration?
Answer:
Osmosis
Explanation:
Answer:
it is osmosis
Explanation:
Osmosis is the process whereby water move from a region of lower concentration to a region of higher concentration across a semi-permeable membrane.
Give an example of a phenotype for your favorite animal: ___________.
Answer:
Dogs
Explanation:
Hope this will help
What is the gradient (change in elevation/length of river) of the Naugatuck River?
Answer:
As the river flows south from Torrington to Derby it drops approximately 540 feet in elevation, resulting in a relatively steep gradient of approximately 13 feet per mile. Consequently, the river is a predominantly rapidly flowing river for most of its length, characterized occasionally by rapids.
CONTAINS GASTRICS JUICES TO BREAK DOWN FOOD.
Pancreas
Large intestine
Small intestine
stomach
Answer:
stomach
Explanation:
Question 6
What is the correct sequence of layers of the atmosphere from innermost to outermost?
А
mesosphere-stratosphere-thermosphere-troposphere
B
troposphere-stratosphere-mesosphere-thermosphere
с
stratosphere-thermosphere-troposphere-mesosphere
D
thermosphere-mesosphere-stratosphere-troposphere
Answer:
it is ?
Explanation:
sorry
Answer:
B. Troposphere - Stratosphere - Mesosphere - Thermosphere
Need help this is due today !! I need help on number 4
Answer:
oceanic plate is more soft or has a lower denisty, the continental plate is more harder so it has a higher density.
Explanation:
why do we need to eat
Where in the world is HIV most prevalent?
Answer:
Explanation:
South Africa
Answer:
South Africa has the most people living with HIV
Explanation:
about 7.5 million
Intervals of geologic time are bound by important events, like mass extinctions or the appearance of animals with hard parts. The first single-celled organisms appeared about 3.5 billion years ago. Many sea animals first show up in the Cambrian period of the Paleozoic era. That was about 545 million years. It is sometimes referred to as the Cambrian explosion because it happened relatively quickly. It lasted just over 50 million years. The next period, , the Ordovician, ended with mass extinctions of 60% of all marine invertebrates. Dinosaurs wouldn't appear for over 200 million years, during the Jurassic period in the Mesozoic era. Based on the passage, in geology, 50 million years is A an era. B not considered a very long time. C too short for any significant events to occur. D about how long dinosaurs were on the planet.
Based on the passage above, in geology, 50 million years is not considered a very long time (Option B).
What is geological time?Geological time is an expression used to describe processes that occurred on a high time scale.
Geological processes such as the emergence of species (speciation) can take millions of years.The processes on a geological time scale are difficult to commensurate from a human thinking perspective.In conclusion, based on the passage above, in geology, 50 million years is not considered a very long time (Option B).
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What contribution to energy do carbohydrates make?
Answer:
Carbohydrates are the nutrients most frequently used as an energy source (containing 4kcal per gram), as they are fast-acting and turn into energy as soon as they are ingested. This energy powers the brain and body. The energy that powers the brain and body is generated when carbohydrates are broken down.
Explanation:
hope its help
thank you
why do you think an embryo has gill stilts when the grown organism has lungs ?
Answer:
The embryo is probably that of an amphibian such as a frog, toad, salamander, or newt.
Answer:
Explanation:
i have no clue
Why do States like Arizona have less potholes than New York?
Answer:
Because New York has way more sewer system's. In 1849, following a series of deadly cholera outbreaks, the city started building sewers. New York laid 70 miles of sewers between 1850 and 1855. It then expanded the sewer network throughout the city as it grew.
Explanation:
can anyone help for question 6?
answer: CTA GGT
it's obvious.
hope it helps.
XD❤️
think before answering
In 2016 the population of Shih-Tzus was 24,500 in the US at a growth rate of 3.2%. How many years will it take for the Shih-Tzu population to reach 55,000?
Answer:
31,000 i just subtracted
Explanation:
When were the ruins of Pompeii first excavated?
a. 1594
C. 79 CE
b. 1748
d. none of the above
Please select the best answer from the choices provided
Ο Α
ОВ
ОС
D
100 POINTS IF YOU ANSWER IN 5-10 mins sorry forgot what subject
Answer:
its c
Explanation:i did that so u can mark him/her
- Which of the following would lead to a cooling of our climate?
-An increase of carbon -dioxide in the atmosphere
-Melting polar ice caps
-Warming of the oceans
-An increase of plant life
Answer:
it would be an increase of plant life
Explanation:
the reason for this is that plants take up the carbon dioxide and give us fresh o2
Fill in the sequence diagram below to summarize Mendel’s experimental process.
First box: Self-fertilization/self-pollination of F1 flowers
Second box: Determine F2 generation phenotypic ratios
Each body cell of an octopus contains thirty-two chromosomes. The number of chromosomes in an octopus egg will be
Answer:
16 chromosomes because if a body cell (diploid) has 32 chromosomes, you need to divide it by 2 to get your egg cell
Explanation:
The rat snake is found in many different environments. They are found in woods, along the coast, in cities, and in mountains. They eat rats, birds, mice, and squirrels. Rat snakes also have varied appearances. They are gray, yellow, black, and mixes of these colors, depending on where they live. Which of the following explains the differences in colors of the rat snake?
A. The rat snakes' colors vary because they eat different foods in different environments that make their skin color change.
B. The rat snakes' colors vary as a result of artificial selection, which allows them to choose the best color suited for their environment.
C. The rat snakes' colors are adaptations caused by natural selection, which help them blend into their environment and hunt for food.
D. The rat snakes' colors vary because they have the ability to change their color like a chameleon in response to a changing environment
Answer:
c
Explanation:
Answer:
the answer is c
Explanation: because artificial selection would be like breading pure bred dogs, but in the wild it would be natural selection.
someone please help me
What materials do motor neurons need to survive and how do they get those materials?
Answer:
Neurons are made up of three major parts: a cell body, or soma, which contains the nucleus of the cell and keeps the cell alive; a branching tree like fiber known as the dendrite, which collects information from other cells and sends the information to the soma; and a long, segmented fiber known as the axon, which transmits information away from the cell body toward other neurons or to the muscles and glands.
organisms are structured and supported by....
Answer:
cells
Explanation:
Answer:
cells
Explanation:
can someone help me ?
A rock is worn and cracked from sediments carried by the wind,
animal actions, acid rain, and ice wedging. Which of the following is
an example of chemical weathering?
A. sediments carried by the wind
B. animal actions
C. acid rain
D. ice wedging