The population in South Africa is more prone to sickle cell anemia (genotype "ss"). People with genotype "ss" survive only up to 14-15 years of age. People with "SS" are prone to malaria because the parasite resides inside their RBCs. People with genotype "Ss" are resistant to malaria because the parasite cannot reside inside their RBCs, and they can live a normal life (without sickle cell anemia).What kind of evolutionary force must be operative in South Africa?
A.
Stabilizing selection
B.
Directional selection
C.
Disruptive selection

Pepsin is an enzyme which acts only in acidic medium ,trypsin is an enzyme which acts in alkaline medium. pepsin is secreted by gastric juice, trypsin secreted by pancreatic juice. Pepsin is secreted in stomach, trypsin is secreted in small intestine. Pepsin is situated in gastric glands, trypsin is situated in pancreas.

Also see the file attached!!!!

Answer:

I would say b

I might be wrong but I hope i helped! ^^

Answer:

it is D

i am pretty sure

Explanation:

plants use the solar energy from the sun to be able to make chemical energy to synthesis their food( this process is called photosynthesis)

Answer:

if the mystery food is tofu, then the indicator test for protein will be positive because tofu contains protein.if the mystery food is tofu, then the indicator test for protein will be positive because tofu contains protein.

Explanation:

hope this helps

Answer:

Option C

Explanation:

C.they are smaller than lakes

Answer:

let's first say that the skin is the largest organ and it's a part of the integumentary system because it helps regulating the body temperature and Incase of high temperature it releases sweat from it's specific swear pores

Answer:

Sweat glands in the skin allow the skin surface to cool when the body gets overheated.\

Explanation:

see the file attached!!

2.In the evolutionary process, mammals and reptiles evolve Amniotes produce membranes that allow them to reproduce without laying eggs in water.

Amniote animals are those that have amnion surrounding the embryo, while non-amniotes do not have this membrane.

3.Homeostasis in environments can have as a negative example a sponge conforming its internal salt concentration to match the salinity of its environment.

By saving too much the marine environment limits the lives of other animals causing them to migrate in this way, there will be a collapse in the food chain.

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Answer:

I hope this helps!!

Explanation:

The existence and perpetuation of life depend on the functioning of cells and their divisions. There are two important processes of cell division, which are inextricably linked with each other to maintain the progress of life. These processes are Mitosis and Meiosis.

After fertilization, when a sperm cell and an egg cell unite to form a new organism, it is expected to carry a double number of chromosomes because both the parents contribute their whole number of chromosomes as appropriate for the respective species. But the process of meiosis prevents the doubling of the chromosomes.

It reduces the total number of chromosomes in half so that the offspring (newly formed cell) can retain the same number of chromosomes as the parents. On the other hand, mitosis facilitates in forming of two daughter cells from a single cell where each new cell resembles the parent cell in every respect. Unlike meiosis, mitosis involves duplithe cation of chromosomal pairs, which is essential for cellular reproduction, especially during growth.

The Mechanism of Mitosis:

A specific process is required for forming two daughter cells out of a mother cell. This process is known as mitosis and it is usually divided into four stages, prophase, metaphase, anaphase, and, telophase. In some cases, it is convenient to designate the transition from prophase to metaphase by the name of prometaphase. However, the whole process of the cycle of mitosis is a continuous one.

1. Prophase:

At the beginning of the prophase stage, the cell prepares itself to divide the chromosomes. It is the resting stage when the nucleus becomes a little larger. It also involves the condensation of the previously diffuse, invisible, or dispersed threads into visible chromosomes.

Each chromosome is optically double, which is composed of two identical and closely parallel strands or chromatids lying throughout their length. A chromosome bears a constriction or a narrow region of attachment to the spindle, which is called a centromere.

Constrictions other than the centromere are sometimes called ‘secondary constrictions’.At prophase s,tage the centromere and secondary constrictions look alike, but by metaphase, this distinction is clear because they develop entirely different relations to the spindle.

In this stage (prophase) the outlines of the chromatids present a slightly irregular woolly or hairy appearance. They do not, in general, show a series of granules (chromo-meres) as are seen at the meiotic prophase, and probably this is a real difference between the two. By the end of the prophase, the woolly appearance almost disappears and a smooth outline is visible.

2. Premetaphase:

At the end of the prophase, the nuclear membrane usually disappears and this stage may be defined as the period of spindle formation. During this stage, the chromosomes give an impression of struggling and pushing among themselves too to reach the equator of the developing spindle. The spindle is relatively a solid gelatinous body. It is composed almost entirely of protein with a very small amount of RNA.

The centrosome seems to act as an organizer of the spindle. The centrosome is the differentiated region of cytoplasm containing centriole, which is a minute granule present just outside the nuclear membrane. After the disappearance of the nuclear membrane, the centriole is doubled and the two centrioles move apart from each other to form the poles of the spindle.

The spindle fibers are probably bundles of protein molecules. A distinction may be made between continuous fibers and chromosomal fibers. The continuous fibers run from pole to pole whereas the chromosomal fibers connect the centromeres to the poles.

In the case of bipolar spindles, the equatorial plane is located perpendicular to the long axis, which is the midway between the poles. As the prometaphase proceeds, the chromosomes arrange themselves with their centromeres, on the equatorial plane of the spindle. It is the most dynamic stage which gives rise to a relatively static Metaphase.

3 specific tasks you must do while working with Professor Ingo Potrykus on this specific project is plant hybridization, growth recognition and quality of the products obtained.

The answer is to obtain populations with genetic variability. This can be achieved through hybridization or crossbreeding. Hybridization is the fusion of genetically different gametes, which results in hybrid individuals heterozygous for one or more loci.

With this information, we can conclude that 3 specific tasks you must do while working with Professor Ingo Potrykus on this specific project is plant hybridization, growth recognition and quality of the products obtained.

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The domain of the new species of unicellular microorganism in an undersea thermal vent that lacks a nucleus is Archeae.

Domain in biology refers to the highest rank in the classification of organisms, above kingdom.

The three domain of organisms are as follows:

Members of Prokarya and Archaea do not possess a membrane-bound nucleus, however, the major difference between them is that members of domain Archaea are found in extreme habitats e.g. hot regions.

Therefore, the domain of the new species of unicellular microorganism in an undersea thermal vent that lacks a nucleus is Archeae.

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Answer:

the body can make all of the compounds it needs

Explanation:

the body gets energy from some compounds

Answer:

positive feedback system

Explanation:

Answer:100 trillion cells

Explanation: hope this helps (; rate 5 thank and pick me brainliest

Answer:

a. Are the vascular bundles, collectively; selerenchyma, xylem and phyloem.

b. Is the ground tissue.

c. is the dermal tissue (epidermis).

The gland that secreted the hormone that made Janelle respond as such would be the adrenal gland.

The adrenal gland is responsible for the secretion of hormones such as cortisol, adrenaline, and aldosterone. These hormones have a wide variety of functions that help maintain the normal body system

Of particular importance is adrenaline in the fight or flight response of humans. It makes major blood vessels contract and redirects blood to the heart - thus causing the heart to beat faster.

Hence, Jenelle's response would have been due to the adrenal gland producing the adrenaline hormone.

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The following did Mendel conclude about patterns of inheritance is B. An organism inherits two genes of a given trait during gamete production. Thus, option "B" is correct.

George Mendel was a famous biologist. His research was on genes and traits. His experiment shows how genes get transferred from parents to offspring. Also he stated about the behaviour and dominance and recessive nature of that alleles.

He also gives the possibility of the dominance of a trait over another trait. The different forms of genes are responsible for various types of inherited traits in an organism.

Thus, option "B" is correct.

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Answer:

B is correct

Explanation:

I got it right on my test, which was 100%.

During cytokinesis in plant cells vesicles that are products of Golgi Apparatus fuse in the middle of two dividing cells fuse and form a cell plate , then the cell plate separates the two dividing cells into two cells

The carbon cycle recycles carbon in the earth and at G, carbon dioxide is released into the atmosphere at G, thus contributing to the carbon cycle.

The carbon cycle is a diagrammatic illustration of a cycle which describes how carbon is recycled in the earth.

The carbon cycle shows the process of how carbon is released to the atmosphere and how it is returned back to the earth's crust.

The process marked G illustrates combustion releasing carbon dioxide to the atmosphere.

The energy transformation at G is chemical energy to heat energy.

Therefore, the carbon cycle recycles carbon in the earth and at G, carbon dioxide is released into the atmosphere at G, thus contributing to the carbon cycle.

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Answer: To me the csi effect is a widely held idea among law enforcement and prosecutors that television series that posses forensic science may want the juror to encourage heavy use of forensic evidence in a case or may want more forensic evidence for convicting criminals of their crimes

Explanation:It could as I’d maybe want people to be properly convicted of their crimes …why ? A lot of people who go to prison are innocent all because of over looked evidence ….why not? Well a cause could be open for too long when ….it’s not that big of an issue

The result of this disease in terms of hemoglobin function is a defective transport of oxygen in the blood cells.

Sickle-cell is a genetic disease where blood cells are known to encode a defective hemoglobin protein.

Hemoglobin protein is responsible for transporting oxygen to all cells of the body, thereby sickle-cell disease causes a problem in this function.

In conclusion, the result of this disease in terms of hemoglobin function is a defective transport of oxygen in the blood cells.

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"A local biologist needs a program to predict population growth. the inputs would be..." The resultant code is

tp=sp

hours = 1

while (hours < t):

tp *= g

hours += r

print("The total population is " + str(int(tp)))

# the call function

Generally, a program is simply defined as programming written into a computer or other equipment in order to do a certain task

In conclusion, to write a program that takes these inputs and displays a prediction of the total population must consider  the parameters and the code platform (python), Hence

# on python interface required library is explored

import math

# describe the functions needed

def prediction():

sp = int(input("Enter the initial number of organism: "))

g = float(input("Enter the rate of growth [a real number > 0]: "))

while(g<1):

print ("Invalid.. growth rate.")

g = float(input("Enter the rate of growth [a real number > 0]: "))

r = int(input("Enter the number of hours to achieve the rate of growth: "))

t = int(input("Enter the total hours of growth: "))

tp=sp

hours = 1

while (hours < t):

# the calculation for tp

tp *= g

hours += r

print("The total population is " + str(int(tp)))

#call the created function

CQ

A local biologist needs a program to predict population growth. The inputs would be: 1. The initial number of organisms 2. The rate of growth (a real number greater than 1) 3. The number of hours it takes to achieve this rate 4. A number of hours during which the population grows.                           For example, one might start with a population of 500 organisms, a growth rate of 2, and a growth period to achieve this rate of 6 hours. Assuming that none of the organisms die, this would imply that this population would double in size every 6 hours. Thus, after allowing 6 hours for growth, we would have 1000 organisms, and after 12 hours we would have 2000 organisms. Write a program that takes these inputs and displays a prediction of the total population.  

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The nuclear envelope distinct the process of transcription and translation in the cell. It controls the release of mRNA from the nucleus through the biological process of transcription.

A nuclear envelope may be characterized as a positively regulated membrane barrier that separates the nucleus from the cytoplasm in eukaryotic cells.

The process of transcription occurs inside the nucleus and transforms DNA into mRNA, while the process of translation occurs in the cytoplasm which transforms mRNA to specific protiens.

Therefore, it is well described above.

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Answer:

Element of proteins

Explanation:

Nucleic acids contain the same elements as proteins: carbon, hydrogen, oxygen, nitrogen; plus phosphorous (C, H, O, N, and P).

I'd say more effective.

"Insects have a more efficient respiratory system than humans. "

But at the same time insects don't have any lungs they breathe through the help of trachea/tubes/and or holes along their abdomen area.

You need to think about how small, compared to us humans, and insect is. They can take in a lot more oxygen than we can (for their size)

If we were to be able to shrink until we're the same size as an insect, they would be the ones taking in way more oxygen because of the way their system is constructed.

Answer:

Hydrophobic Amino Acids.

Explanation:

Answer:

A

Explanation:

analogous structures

Analogous structures are similar in function but do not necessarily suggest that the organisms are related.

The term “analogous” is used to describe biological structures that have similar or analogous functions but are not of the same evolutionary lineage. This means that the same biological structures are used by the same species for the same purposes, but the species are from different evolutionary origins. This type of evolution is called convergent evolution.

For example, similar structures of different species might have similar or equivalent functions, even though they originated from a different evolutionary point of view.

The wings of birds and insects are similar organs. Both birds and insects have wings that allow them to fly. However, their wings come from different ancestors. This is an example of analogous structure.

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Answer:

Because the tongue is a muscle. Muscles can be involuntary(moves without control) or voluntary(controlled). Necessarily, the tongue is not an involuntary muscle, but the tongue not staying still, scientifically, can be a sign of lacking energy.