BIOLOGY HIGH SCHOOL

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How does the uncontrolled cellular division result in cancer cells?

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Answer 1
Answer: Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
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Earthquakes are usually associated with _____. a. violent weather b. faults c. large cities d. the east coast of North America
In a population of humans, the frequency of straight hair is 34 percent. If straight hair is the recessive phenotype, what is the frequency of the homozygous recessive genotype?

The substance that typically provides rigidity to fungal cell walls, and is also found in the external skeletons of insects and other arthropods, is called ____.

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Answer:

Chitin

Explanation:

Chitin is a natural biopolymer that is made of the N-acetylglucosamine, modified glucose.

Chitin is an important polymer mainly for the fungi and the arthropod insects as it is present in the cell wall of the fungi and the exoskeleton of the insects.

The chitin provides a protective function to this organism that the digestive enzymes cannot degrade this chitin but only the symbiotic bacteria can digest eat therefore they are sometimes avoided to be eaten.

Thus, chitin is the correct answer.

What type of nerve fiber is responsible for the fastest transmission of nociception?

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Fibers A and fibers C are those involved in nociceptive transmission, considered first-order neurons. They are bipolar neurons with the soma in the dorsal ganglia of the peripheral nerves and a prolongation that penetrates the posterior horn of the spinal cord.

PLEASE HELP WITH QUESTION BELOW?!

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Okay, so overall, the unicellular (presumably bacterial) organisms are going to be the most similar when talking about genetic material as the genetic material doesn't have to code for as many proteins as it would in a multicellular organism. For example, in humans, our genome codes for every protein in every cell in every tissue in every organ in every system in your body. However, unicellular organisms have to code far less as they have a very limited amount of proteins that they actually have to form. You'll have some differentiation when it comes to diet, but overall, the answer should be organisms A and C.

Glen is attempting to use operant conditioning to train his dog, Thor, to fetch a ball upon command. To test Thor’s understanding, Glen throws the ball and yells, “Pineapple!” Thor does not fetch the ball. Which process of operant conditioning has Thor demonstrated?

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Glen throws the ball and yells, “Pineapple!” Thor does not fetch the ball.

Here, the process of operant conditioning that Thor has demonstrated is- stimuli discrimination.

A stimuli or stimulus discrimination is a behavior which results in one consequence in a particular setting and another consequence in other settings.
Thor demonstrated a stimulus generalization for its operant conditioning. Stimulus generalization occurs when there are repeated stimuli resulting to similar responses. In the situation, the operant conditioning gave a stimulus for Thor to respond on the same way but when Glen yells "Pineapple!" then his dog did not respond because it is not the same as the previous stimulus.

Which of the following is not a reason for the lack of a fossil record from the Precambrian time? A. The single-celled organisms that existed during that time did not leave easily identifiable fossils. B. Like the rocks of the Phanerozoic eon, Precambrian rocks contain many visible signs of complex life forms. C. Multi-celled organisms evolved in the oceans during the latest years of the Precambrian time. D. Precambrian rock has been eroded or metamorphosed over billions of years, and very little of it remains at the surface.

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The right answer is B

The development towards 1.4 Ga of eukaryotes, aerobic organisms such as unicellular algae, will be decisive for the oxygenation of the Earth's atmosphere.

The first multicellular organism is a red alga dating back to 1200 Ma during the Mesoproterozoic era (part of Precambrians). Various forms of life with soft bodies dated between 600 and 541 Ma constitute what is called the Vendian fauna, that is to say the fauna of the Ediacarien.

The appearance of a great diversity of small shelly fauna from 541 Ma will mark what is called the Cambrian explosion.

Which is only active during a specific immune response?A. Neutrophils
B. Macrophages
C. Lysozymes
D. T cells

Answers

Ans. (D). T cells.

Immune responses are reactions of immune cells and substances against foreign substances or abnormal cells.

Specific immune responses are elicited by adaptive immune system, which is made up of T-lymphocytes and B-lymphocytes. These cells are highly specialized that function in elimination of pathogens and prevent their growth.

Thus, the correct answer is option (D).
The answer is T cells
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Homo sapiens (human)| size 2,900 million bases| gene # -30,000| gene density 1 gene per 100,000 bases| chromosome #46 Rattus novegicus (rat)| size 2,750 million bases| gene # -30,000| gene density 1 gene per 100,000 bases| chromosome #42 Mus musculus (mouse)| size 2,500 million bases| gene # -30,000| gene density 1 gene per 100,000 bases| chromosome #40Drosophila melanogaster (fruit fly)| size 180 million bases| gene # 13,600| gene density 1 gene per 9,000 bases| chromosome #8Arabidopsis thaliana (plant)| size 125 million bases| gene #25,500| gene density 1 gene per 4,000 bases| chromosome #10Caenorhabditis elegans (roundworm)| size 97 million bases| gene #19,100| gene density 1 gene per 5,000 bases| chromosome #12Saccharomyces cerevisiae (yeast)| size 12 million bases| gene #6,300| gene density 1 gene per 2,000 bases| chromsome #32Escherichia coli (bacteria)| size 4.7 million bases| gene #3,200| gene density 1 gene per 1,400 bases| chromosome #1H. influenzae (bacteria)| size 1.8 million bases| gene #1,700| gene density 1 gene per 1,000 bases| chromsome #1The table shows the relative size of the genomes, number of genes, and number of chromosomes for a variety of different organisms. Based on what we know regarding the genetic code of all living things, how does the genetic code of a eukaryote organism compare to that of a prokaryote organism? A) Prokaryote organisms have much simpler DNA, containing fewer than four nitrogen bases. B) Eukaryote organisms have a larger genome containing a more complex set of nitrogen bases. C) Both types of organisms contain exactly the same four nitrogen bases, but in different sequences and numbers. D) Both types of organisms contain exactly the same four nitrogen bases, in the exact sequences, but in varying numbers.