Calcium is the chemical element of atomic number 20, with a Ca.sup. Symbol of molar mass of 40 g / mol.
It is a hard gray-white, alkaline-earth metal that is never found in pure bodies in nature. It is the fifth most abundant element of the earth's crust (more than 3%) and is essential for organic matter: formation of bones, teeth and shells. Calcium also plays a very important role in cell physiology.
To calculate the number of moles of calcium, you have to apply the law of:
Number of moles = mass / molar mass.
n = m / M = 0.06 / 40 = 1.5 × 10 -3 mol = 1.5 mmol.
The number of moles of calcium is 1.5 milli-moles.
A specimen is 0.2 mm long. Calculate the length of its image if it magnified by 1000 times.
How do worms reproduce?
a. only sexually.
b. only asexually.
c. both sexually and asexually.
d. none of the above?
Worms, depending on the species, can reproduce option c. both sexually and asexually. Annelids, like earthworms, can reproduce in both ways, whereas flatworms generally reproduce sexually.
They fertilize their own eggs after exchanging sperm with another worm during sexual reproduction. They can also reproduce asexually by budding or fission, for example.
Flatworms, on the other hand, typically reproduce sexually. After fertilization, a single flatworm produces both eggs and sperm, and the eggs turn into larvae outside the adult flatworm's body.
Nematodes, like C. elegans, also use a variety of reproductive methods. Depending on the species, these may include dioecious reproduction, monoecious reproduction, self-fertilizing hermaphrodites, or even asexual reproduction through parthenogenesis.
these group of cells represent different ___
a. organelles that carry out different functions
b. tissues in which similar cells function together
c. organs that help to carry out a specific life activity
d. systems that are responsible for a specific life activity
thanks!! xoxo
Answer:
b. tissues in which similar cells function together
Explanation:
I got it right on my test.
The ends of DNA molecules form telomeres that help keep the ends of chromosomes from sticking to each other. Why might this be especially important in germ cells, which go through meiosis and make haploid gametes?
The telomeres which keep the ends of chromosomes from sticking to each
other is important because it helps to prevent mutation and death of
offspring.
Telomeres are referred to as the ends of the chromosome. They prevent
sticking together of the homologous chromosomes during the process of
separation in meiosis.
If the telomere is absent and sticking together happens then one of the
resulting gametes will have extra chromosome with a corresponding
deficiency in the chromosome of the other thereby resulting in lower
reproductive rate, mutation and death
Read more about Telomeres here https://brainly.com/question/5896537
Which human activity does not affect the Earth system? (1) disposing of toxic wastes (2) converting solar energy (3) clearing land for farming (4)
burning natural gas and coal
The type of line recognized by the brain and eyes but is not actually present.
What do all carbonate minerals have in common?
If aden- means gland, what word could mean a tumor of the sebaceous glands?
Final answer:
The term for a tumor of the sebaceous glands combining 'aden-' for gland and '-oma' for tumor is 'sebaceous adenoma', which is a benign growth originating from the oil-producing sebaceous glands.
Explanation:
If the term "aden-" refers to a gland and we are discussing a tumor of the sebaceous glands, the medical term for such a tumor would often include the suffix "-oma", which refers to a tumor. Thus, the word that could describe a tumor of the sebaceous glands is "sebaceous adenoma". A sebaceous adenoma is a benign tumor that arises from the sebaceous glands which are responsible for producing sebum.
Sebum is the oily substance that helps to lubricate and protect the skin and hair. While sebaceous adenomas are usually not serious and often do not require treatment, they could potentially indicate an underlying condition if they are multiple or irregular.
The main energy resource used by industrialized countries is
If an experiment starts with 6 bacteria cells and ends with 96 bacteria cells, how many generations did the cells go through?
In order to calculate the number of bacteria generations, you use logarithms. Taking the log base 2 of the final number of bacteria divided by the initial number gives approximately 4 generations.
Explanation:The generational growth of bacteria cells is typically exponential, doubling with each generation. Since we're starting with 6 cells and ending up with 96, we need to figure out how many times 6 needs to be doubled to get 96. This can be calculated by using the formula of logarithm base 2. Firstly, divide 96 by 6 to get approximately 16 then, calculating the base 2 logarithm of 16, gives us about 4. So the cells went through about 4 generations.
Learn more about Bacteria growth here:https://brainly.com/question/34853242
#SPJ2
Where are cardiac pacemakers usually positioned during implantation?
The vascular pressure that declines from roughly 35 mm hg to about 18 mm hg is the
How can pools of blood aid in reconstructing a crime scene?
Why does this particular case interest Holmes? A. Holmes feels sorry for Mr. Wilson. B. The case presents a unique course of events. C. The case involves red-headed men. D. Holmes is looking for a new hobby
A cell is placed in a water solution with the same salt concentration as the cell. The cell is placed in a _____.
hypotonic solution
hypertonic solution
isotonic solution
The answer is isotonic solution.
Should commercial fruit farmers be allowed to use ethylene to accelerate the ripening of fruit for the market? Why or Why not?
The answer is: NO
Accelerated ripening of fruits lowers the quality of the fruits because it circumvents the natural process of ripening. In some cases of accelerated ripening, one finds a premature fruits looking ripe. In other cases, it causes ununiform ripening and also causes hastened senescence reducing shelf life.
The commercial fruit farmers should not be allowed to use ethylene.
Though ethylene is a natural growth regulator in the plant, if it is not applied in limited quantity it produces adverse effects such as overly ripened fruits, yellowing of green fruits and fruit becoming excessive soft and loose to pre maturity. It leads to chlorophyll destruction and also inhibits vegetative tissue. It also inhibits auxin transport, flower development, shoot and root growth.
Property Expected from Muscle Fibers..?
Muscle fibers are complex multicellular units equipped with several components that enable their functional properties, most importantly muscle contraction. These include the sarcolemma (plasma membrane), sarcoplasm (cytoplasm), sarcomeres (functional unit), and several other structures and proteins. There are also different types of muscle fibers that use different metabolic methods to generate ATP, the energy for muscle contraction.
Explanation:Skeletal muscle fibers are long, multinucleated cells contained within a plasma membrane, the sarcolemma. The cytoplasm of the cell is referred to as sarcoplasm, which along with the specialized smooth endoplasmic reticulum or sarcoplasmic reticulum plays an important role in the property of muscle contraction through the release and retrieval of calcium ions. The functional unit of a muscle fiber is the sarcomere, an organized arrangement of actin and myosin filaments that, through a series of steps, shorten to produce movement.
The number of sarcomeres and myofibrils within a muscle fiber, which can be influenced by factors such as hormones and stress, can result in hypertrophy, increasing the mass of a muscle, or, if muscle use is decreased, atrophy, wherein the muscle mass decreases. The three types of skeletal muscle fibers, slow oxidative, fast oxidative, and fast glycolytic, each use a different metabolic method to generate ATP, the energy for muscle contraction.
Learn more about Muscle Fibers here:https://brainly.com/question/32217376
#SPJ12
What is the correct chromosomal condition at prometaphase of mitosis?
In prometaphase of mitosis, chromosomes compact and become visually distinguishable, the nuclear envelope breaks down, and the mitotic spindle's microtubules attach to the kinetochores on the chromosomes.
Explanation:During the prometaphase of mitosis, the chromosomal condition is that each chromosome compacts and becomes visually distinguishable under a light microscope. The nuclear envelope begins to break down, and the chromosomes, composed of two sister chromatids, free in the cytoplasm of the cell. Moreover, the microtubules from each centrosome, constituents of the mitotic spindle, attach to a specific protein structure on the centromere of each chromosome called a kinetochore. This ensures that each daughter cell receives an equal distribution of chromosomes during the ensuing mitotic phase, metaphase.
Learn more about Prometaphase of Mitosis here:https://brainly.com/question/31087196
#SPJ6
Habitat destruction is the leading cause for declining populations of species on our planet. Due to human development, industry, and forestry, humans are destroying the habitat of many species at an alarming rate. Consider the bald eagle. The bald eagle population was threatened in the late 60s and early 70s. Thanks to an aggressive bald eagle protection program, bald eagle numbers in the wild have soared as seen in the population graph above. The bald eagle's population very nearly reached extinction. Why did the bald eagle's declining population make it more vulnerable to extinction? A) As populations decline, reproduction stops B) As populations decline, less resources are available C) As populations decline, there is less genetic diversity D) As populations decline, birds migrate farther away from other populations
C) As populations decline, there is less genetic diversity
As populations decline, there is less genetic diversity The bald eagle's population reached alarmingly low numbers due to habitat loss and with low populations, there is not as much genetic variability. With fewer variations, a species survival is difficult to overcome without conservation efforts.
~USATestprep~
What is the safest way to carry a microscope? One student should hold onto the base and one student shouldWhat is the safest way to carry a microscope? One student should hold onto the base and one student should grasp the arm. Two students should hold opposite sides of the microscope base. Place one hand under the base and grasp the arm with the other hand. Place both hands securely around the base of the microscope. grasp the arm. Two students should hold opposite sides of the microscope base. Place one hand under the base and grasp the arm with the other hand. Place both hands securely around the base of the microscope.
Answer: Place one hand under the base and grasp the arm with the other hand.
A microscope is a device that is used to magnify and observe small living and non-living entities. These microscopes are expensive instruments and need to be handle carefully. The correct way to handle a microscope is to place the hand under the base of the microscope, this provides support to the instrument. The other hand should be used to grasp the arm, this provides a hold over the instrument. This is the safest way that assures proper handling and transfer of microscope from one place to another manually.
The genetic makeup of a trait is represented by two letters. what do these letters represent?
Which plane shows brain structures as they would be seen from the front?
The plane that shows brain structures as seen from the front is the frontal or coronal plane. This vertical plane divides the brain into front and back regions. It runs parallel to the eyes or ears.
The vertical plane that shows brain structures as they would be seen from the front is called the frontal or coronal plane. This plane runs parallel to the eyes or ears and divides the brain into front (anterior) and back (posterior) regions. For example, a slice of the brain taken along the coronal plane would look similar to slicing a loaf of bread with the eyes at the front, allowing you to see both the left and right side structures positioned frontally.
In starfish, pink boy color(P) is dominant to orange(p) , and thick eyebrows(T) are dominant over thin(t) ones. Patrick , who is heterozygous for body color but purebred for thick eyebrows , has met Patti , who is recessive for both traits.
What's patti's phenotype?
Is it possible for the new couple to have offspring that resmeble their mother? explain?
Dna is wrapped around proteins called _____ to form a chromosome.
Final answer:
DNA in eukaryotic cells is wrapped around histone proteins to form nucleosomes, which create the 'beads on a string' structure. These are further compacted to form chromosomes, especially during cell division.
Explanation:
DNA is wrapped around proteins called histones to form a chromosome. Eukaryotic DNA, which is negatively charged due to phosphate groups, is tightly wound around these positively charged histone proteins. The formation begins with DNA winding around an octamer of histones to create a structure known as the nucleosome. This structure resembles "beads on a string", with each "bead" representing a nucleosome and the string being the linker DNA.
The arrangement is then coiled into a 30 nm fiber and, during cell division, becomes even more densely packed into chromosomes by additional scaffold proteins. This packaging method is central for fitting DNA into the nucleus of eukaryotic cells and for the regulation of gene expression.
what is represented by the sequence below?
a. a feedback mechanism in multicellular organisms
b. differentiation of organic molecules
c. the disruption of cellular communication
d. an immune response by cells of the pancreas
thanks! xoxo
a. a feedback mechanism in multicellular organisms
Trees do not move like birds do but they are living things. why
Light energy from the sun is converted by plants into _____. electricity chemical energy leaves mechanical energy
Answer:
chemical energy
Explanation:
He movement of which kind of molecules is controlled by osmosis?
How does the structure of a red blood cell relate to its function?
Due to its biconcave shape, red blood cells have the ability to deliver the amount of oxygen to various organs and tissues of the body of an individual.
What do you mean by Red blood cells?Red blood cells may be defined as a type of blood cell that is made in the bone marrow and found in the blood which contains hemoglobin.
Red blood cells do not have a nucleus in their structure and contain hemoglobin which increases the affinity of oxygen to bind with it and transport this bound oxygen to the whole body through the transport of bounded oxygen with hemoglobin particles.
Therefore, the function of RBCs with respect to their structure is described above.
To learn more about the Red blood cells, refer to the link:
https://brainly.com/question/291206
Which statements describe the characteristics of an individual protein? Check all that apply.
It is specific to one biochemical reaction.
It increases the activation energy needed for a reaction.
It can catalyze many different reactions.
It increases the rate of a biochemical reaction.
It slows down the rate of a biochemical reaction.
It is specific to one biochemical reaction.
It increases the rate of a biochemical reaction.
The characterstics of individual protein are:-
it is specific to one biochemical reactionit increases the rate of a biochemical reactionWhat are proteins?Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acids.
What is biochemical reaction?It is the transformation of one molecule to a different molecule inside a cell.
To know more about individual protein here
https://brainly.com/question/17571136
#SPJ2