Which of the following must take place before cell division can occur?
A.
the replication of a cell's genetic material
B.
the joining together of two unique cells
C.
the infection of a cell by a parasite
D.
the removal of a cell's organelles

Answer:

the answer is B I did this last week

Gamma rays are the spectral particles with the highest energy and shortest wavelength. This form of decay does not result in the release of any particles from the nucleus.

The spindle holds the alleles, which are the structures that house the genetic traits, and governs and regulates the functions of the cell. The nucleoplasm is the gel-like membrane that contains the nuclear parts are suspended.

Due to its role in the storage, retrieval, and copying of genetic material, the nucleus is regarded as among the most significant components of eukaryotic cells. The genetic material is housed in an organelle with two membranes.

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There are 44 autosomes and two sex chromosomes in each person. Human somatic cells have 22 pairs of autosomes and either two X chromosomes or an X and a Y chromosome.

A chromosome is a long molecule of DNA that contains the genetic material of various organisms. Most eukaryotic chromosomes exist in tandem with histone proteins, which aid in DNA stability.

Each chromosomal pair is made up of one chromosome from the mother and one chromosome inherited from the father. Human males produce gametes with two types of sex chromosomes, X and Y, whereas human females produce gametes with only one type of sex chromosome, X.

The male gamete is referred to as heterogametic or heteromorphic, while the female gamete is referred to as homogametic or homomorphic, depending on the gamete produced. The number of chromosomes varies from organism to organism, but they are an important part of the cell because they not only impart essential qualities to the organism and also aid in the synthesis of important proteins which play important metabolic roles, resulting in the organism's proper functioning.

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Answer:

"Plasma membrane monoamine transporter (PMAT) Four phases of mitosis: prophase, metaphase, anaphase, and telophase."

PMAT is the order of the phases of mitosis.

The interaction of hypothalamic and anterior pituitary hormones with reproductive tissues and organ hormones regulates the human male and female reproductive cycles. In both sexes, the hypothalamus regulates and causes pituitary hormone release.

The normal menstrual cycle is a sequential event in which the hypothalamus secretes GnRH, the pituitary gland secretes follicle stimulating hormone and luteinizing hormone (LH), and the ovary responds to those hormones by recruiting a dominant follicle and secreting estradiol and inhibin A. Estradiol stimulates cervix endometrial proliferation and mucus production. A peak in estradiol causes the release of LH, which is responsible for ovulation and the subsequent secretion of progesterone by the corpus luteum, which involutionates 14 days later if not stimulated by hCG (pregnancy). Normal menstrual cycles last 28 days, with a two-day fluctuation in the same woman considered a normal pattern or a regular cycle. The normalcy of these events would allow for successful embryo implantation in the case of trying to conceive. To be fertilized, a capable spermatozoon must reach an adequate ovule during the ovulatory stage. The spermatozoon can survive for up to 5 days in the feminine genital ractum , but the ovum can only be fertilized for 12-24 hours. Fecundation takes place in the distal third of the fallopian tube, and the fecundated zygote develops into a morula before being implanted at the endometrium four days later.

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Answer: D. irregular

Explanation:

Each mRNA nucleotide's three letters is either a stop codon or a specific amino acid.

Three components make up mRNAs: The 3′ end controls the stability of the mRNA, the center specifies the sequence of amino acids in the polypeptide, and the 5′ end provides binding sites for proteins that start the synthesis of polypeptides.

A codon is a set of three nucleotide bases in messenger RNA that designates a certain amino acid. These codons will complement an anticodon that is linked to an amino acid.

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The expected phenotype ratio of the offspring from the cross would be  1 with red stripe, 2 with red and yellow stripes, and 1 with yellow stripe. Option 1.

According to the illustration, the inheritance pattern of color in the grasshopper species is codominance.

Red striped grasshopper is RR, and the yellow stripe is YY, while RY grasshoppers have both red and yellow stripes.

Now, a grasshopper with red and yellow stripes (RY) mates with another grasshopper who also has red and yellow stripes (RY):

   RY    x    RY

RR   RY   RY   YY

Since RR is red stripe, RY is red/yellow stripes, and YY is yellow stripe; then, the phenotype ratio of the offspring from the cross would be:

In other words, the phenotype ratio from the cross would be 1 with red stripe, 2 with red and yellow stripes, and 1 with yellow stripe.

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The end outcome is the biodiversity we are familiar with today. However, it is impossible to directly compare species because their genes are varied and they do not all have the same number of genes.

Does everyone share a genome? Most people have a similar human genome. The genome does, however, contain variants. Differences in look and health are a result of this genetic variation, which makes up roughly 0.001 percent of each person's DNA.

All plants and animals are composed of cells, and those cells contain genetic material in the form of genes and chromosomes (usually in the nucleus).

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Answer: Replication is the duplication of two-strands of DNA.

Explanation:

Transcription is the formation of single, identical RNA from the two-stranded DNA.

suppose a scientist discovers a gene that he believes promotes pluripotency. he could test this possibility by depleting it from the somatic nucleus to see if nuclear reprogramming becomes less efficient

The capacity of some substances to elicit a variety of unique biological reactions is referred to as the pluripotency of biological molecules. As with pluripotent stem cells' ability to differentiate into several cell types, pluripotent is also used to denote something that has no predetermined developmental potential.

A term with several "potentials" is plural. In other words, these cells have the capacity to transform into all more than 200 different cell types in the body. Both induced pluripotent stem (iPS) cells, which are reprogrammed from adult tissues, and embryonic stem cells are pluripotent.

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Complete question:

Suppose a scientist discovers a gene that he believes promotes pluripotency. How could he test this possibility?

a. Transduce it into somatic cells with Oct4, Sox2, c-myc, and Klf4 to see if nuclear reprogramming becomes more efficient

b. In a somatic cell nuclear transfer experiment, deplete it from enucleated eggs to see if nuclear reprogramming becomes less efficient

c. In a somatic cell nuclear transfer experiment, deplete it from the somatic nucleus to see if nuclear reprogramming becomes less efficient

d. In a somatic cell nuclear transfer experiment, deplete it from enucleated eggs to see if nuclear reprogramming becomes more efficient

e. Two of the above answers are correct

Answer:

D. Both self feeders(plants) and other feeders(animals and microorganism)

Explanation:

The membrane-enclosed organelles are mitochondria, which are present in the cells of virtually all eucaryotic organisms (including fungi, animals, and plants), and plastids—most notably chloroplasts—which occur only in plants.

I hope this helped

Answer: D. Both self feeders(plants) and other feeders(animals and microorganism)

Explanation:

      .

The cochlea sends information about sound stimuli to the cochlear nucleus of the brainstem via auditory nerve fibres.

Depending on whether receptor cell population in the cochlea is contacted, the neurons that give rise to these fibres can be split into two categories.

Basically, vibrations (sound signals) are transmitted to the brain via the auditory nerve. Remember that hearing sounds is made possible by several different parts of the ear, not just the auditory nerve. A number of additional ear components are also involved.

Some sensory systems that provide information that is relevant to motor functions are distinguished by a "spatial code" in addition to a "temporal code" because they display characteristics that are tailored to specific spatial directions. Examples include otolith and semicircular canal afferents, as well as muscle spindle afferents.

Complete question:

The volley principle first proposed by Weaver & Bray (1937)

describes the response of auditory nerve fibers that allows for the plausibility of the theory of frequency representation:

a) place code

b) temporal code

c) population code

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Answer:

Extremophilic microbes

Explanation:

The Most Extreme Creatures Extremophilic microbes are a wild bunch. They can be found thriving in some of the most hostile environments imaginable - swimming in near-boiling water, eating rocks, lounging in sub-zero temperatures, and hanging out where radiation levels rival nuclear reactors.

Answer: An oversimplified or exaggerated generalization used to describe or distinguish a group is called a stereotype.

It is False.

Toxins are substances created with the aid of flora and animals which can be poisonous (poisonous) to human beings. Pollutants may additionally encompass some drugs which can be useful in small doses, but toxic in large quantities. Maximum toxins that cause problems in human beings come from germs along with bacteria.

Anthrax deadly toxin is produced with the aid of Bacillus anthracis. The anthrax toxin proteins, which include anthrax lethal element, work together to disrupt a mobile's defense machine.

A few natural toxins may be fashioned in food as defense mechanisms of vegetation, through their infestation with toxin-generating mold, or thru ingestion by way of animals of toxin-generating microorganisms.

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Answer:

Reproduction.

Explanation:

One piece of evidence that a virus is non-living is that it cannot reproduce on its own.

Unlike living organisms, viruses require a host cell to replicate and produce more viruses.

This dependence on a host cell for reproduction suggests that viruses are not truly alive, as they lack one of the key characteristics of living things, which is the ability to independently sustain and replicate themselves.

The sympathetic branch of the autonomic nervous system raises heart rate, blood pressure, and breathing to get the body ready for exercise. The sympathetic division also encourages the liver to release glucose for use as fuel.

To increase heart rate, the sympathetic nervous system (SNS) produces the catecholamines epinephrine and norepinephrine. The primary function of the parasympathetic nervous system is to calm down or lessen your body's activity. The rhyming expressions "rest and digest" or "feed and breed" are good methods to remember what your parasympathetic nervous system performs because of the messages they carry. When a person is confronted with a dangerous or terrifying scenario, one component of the autonomic nervous system, known as the sympathetic nervous system, reacts. It will automatically raise heart rate and respiration while moving blood to the muscles.

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For the regulation of genes during nutritional shortage and stress, development and differentiation, nervous system function, aging, and illness, translational control in eukaryotic cells is essential. Prokaryotes are able to respond quickly to environmental cues because transcription and translation happen simultaneously in the cytoplasm.

Any organism without internal membranes is referred to as a prokaryote, usually written procaryote. These organisms lack a defined nucleus and other organelles.

eukaryotic can be explained as a living things with nuclei in their cells. Eukaryotes include all animals, all plants, all fungi, and many unicellular creatures.

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In a myofibril the thick filament is composed of pairs of myosin molecules that are intertwined together.

The protein myosin makes up thick filaments. Near the M line, a myosin molecule's tail joins with other myosin molecules to form the thick filament's core region, while the thick filament's heads align on either side where the thin filaments overlap. The thick and thin myofilaments that make up the myofibrils are what give the muscle its striped appearance. Along with two other muscle regulating proteins, tropomyosin and troponin, the thick filaments are made up of strands of the protein myosin, while the thin filaments are made up of strands of the protein actin.

In addition to myosin, which forms the thick filament's backbone, four additional proteins—titin, myomesin, obscurin, and myosin binding protein-C—that are tightly attached to the filament also perform crucial structural and regulatory functions.

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The anterior division of the piriform cortex produces representations of the features of odorant molecules.

Piriform cortex is a region of the brain also called as pyriform cortex, situated in the cerebrum region. Its function is to regulate the mechanisms of the olfactory experiences. It is at the junction of the temporal and frontal lobes.

Odorant molecules are the ligands that bind to the odorant receptors present at the neurons of the body involved in the olfactory responses. They are names odorants because they perceive smell. The receptors of the odorant molecules are GPCRs. Odorants are of various types based on the type of functional group they possess.

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Answer:

1. Soil and water samples for levels of DDT and its metabolites

2. Air samples for levels of DDT and its metabolites

3. Sediment samples for levels of DDT and its metabolites

4. Biological samples for levels of DDT and its metabolites

5. Surface water run-off for levels of DDT and its metabolites

6. Aquatic life for levels of DDT and its metabolites

7. Plant life for levels of DDT and its metabolites

8. Temperature and pH levels in the environment

9. Wind speed and direction

10. Rainfall levels

In the story of a small village, the character who is described to be round and bubbly and has a habit of baking treats for everybody would be of an endomorph somatotype.

Somatotypes are founded on the idea that every person has a certain body type at birth. Skeletal structure and body composition are expressions of one's body type, or somatotype, which is inherited. The endomorph body type is characterized by a higher proportion of fat and muscle.

Despite being hefty, these individuals are not always fat. If you have an endomorph body type, you are aware of how difficult it is to grow muscle mass and shed weight. You may obtain optimum health and fitness by following specialized diet and exercise routines. Endomorphs have more supple, curved bodies.

They may or may not be overweight, but they have wide hips, a huge frame, and wide shoulders. Their lower belly, thighs, and hips frequently carry the majority of their weight.

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The figure 3 shows an example of an insertion mutation.

An insertion is the addition of one or more nucleotide base pairs into a DNA sequence. This can often happen in microsatellite regions due to the DNA polymerase slipping.

Moreover, an insertion changes the DNA sequence by adding one or more nucleotides to the gene. As a result, the protein made from the gene may not function properly.

An insertion mutation occurs when an extra nucleotide is added to the DNA strand during replication. This can happen when the replicating strand "slips," or wrinkles, which allows the extra nucleotide to be incorporated.

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Parasympathetic, sympathetic, sensory, and motor roots can all be found in the otic ganglion.

All branches of the mandibular division of the trigeminal nerve receive postganglionic parasympathetic secretomotor fibres from the otic ganglion. Additionally, the parotid gland receives sympathetic vasomotor fibres from it. The infratemporal fossa's medial side and the tiny parasympathetic ganglion known as the otic ganglion are both situated just below the foramen ovale. It functions as the glossopharyngeal nerve's functional partner and innervates the parotid gland to stimulate salivation. The auriculotemporal nerve most likely sends signals to the superficial temporal artery from the otic ganglia. Because migraine attacks involve the superficial temporal artery, this is clinically intriguing.

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Answer: In chloroplasts, water is the source of the electrons needed for photosynthesis.

Explanation:

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Answer:

The founder effect is an example of genetic drift

A population has members with the same appearance and features, such members encounter similar problems in the environment they live in. Some members of the population start living in a different place due to some reason. In that new area, they form a colony and start to adapt to different environments. This is called the founder effect. This brings change into sets of genes causing genetic drift.