How was CMB radiation first discovered?
The identification of the Cosmic Microwave Background (CMB) radiation represents a crucial turning point in our comprehension of the cosmos. Here is a brief of how it was initially found:
1. Theoretical hypothesis: George Gamow, Ralph Alpher, and Robert Herman postulated in the 1940s that the Big Bang, the phenomenon that created the universe, would have left behind a weak radiation that penetrates all the space. Around 380,000 years after the Big Bang, when the cosmos first became transparent, this radiation would have been produced.
2. Proof of the hypothesis: Using a large horn-shaped antenna, Arno Penzias and Robert Wilson carried out radio astronomy experiments in the 1960s. They heard a constant background noise that appeared to be coming from all sides.
Therefore, CMB was discovered by Wilson and Penzias which to confirm Big Bang Theory.
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which of the following cells would not have a well-defined nucleus but would have a thick cell wall and ribosomes?
A) onion cell
B) E. Coli bacteria
C) human brain cell
Answer:
A.
onion cell
Explanation:
when during the cell cycle do chromosomes first become visible?
How does the structure of phylogeny charts explain homologous structures in organisms?
New species branch off ancestral species, so two species can have similarities in body structure.
All old species die off as soon as new species emerge, which explains why current species have traits of extinct species.
In different lineages of organisms, two organisms may have similar structures that evolved in different ways.
All organisms mutate their genome automatically when an environment changes, creating new traits and structures.
The structure of phylogeny charts explain homologous structures in organisms by all organisms mutate their genome automatically when an environment changes, creating new traits and structures.
What is phylogeny charts?The chart that tells about evolutionary relationship with organism or species.
The Phylogeny charts used by scientist to show the evolutionary path and connection among organisms.
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This is a biological process that requires oxygen.
Aerobic respiration is the biological process that requires oxygen to produce energy (in the form of ATP), carbon dioxide and water. Involving the transportation of oxygen via the blood to tissues, this process makes up approximately 95% of our normal energy production. If oxygen was not present in the atmosphere, life would have to rely on different processes such as anaerobic respiration or fermentation.
Explanation:The biological process that requires oxygen is known as aerobic respiration. This process breaks down glucose or other nutrients in the presence of oxygen (O2) to produce carbon dioxide, water, and ATP - the main source of energy for cells. Approximately 95 percent of the ATP required for resting or moderately active muscles comes from aerobic respiration, taking place in the energy factories of cells, the mitochondria.
During this process, oxygen passes from the lungs into the blood, where it combines with hemoglobin to form oxyhemoglobin. In this state, it's transported to various tissues where it's used for producing energy. Ultimately, the process outputs the waste products carbon dioxide and water, which are transported back to the lungs to be exhaled.
Without the oxygen present in our atmosphere, life as we know it would rely on anaerobic respiration or fermentation. This is because, evolutionarily, some prokaryotes began to use sunlight to photosynthesize, using water as the hydrogen source and releasing O2 as a 'waste' product - in turn allowing for aerobic respiration.
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True false: sister chromatids are created for each of the multiple chromosomes found in the cell's nucleus.
A macromolecul that contains carbon,hydrogen,oxygen,nitrogen which is used by the body for growth and repair
Answer:
Protein.
Explanation:
Biomolecules may be defined as the organic molecules that are present in the living organisms. Four important types of biomolecule are carbohydrates, proteins, lipids and nucleic acids.
Proteins are the polymers of the amino acids. The proteins monomer consists of hydrogen, carbon, oxygen and nitrogen. Proteins are important for the living organisms all enzymes, antibodies and clotting factors are made up of proteins. The proteins are important for the repair and the growth of the body.
Thus, the answer is proteins.
The largest pod is a type i. (
a. true (
b. false
Saltwater fish constantly drink water but still excrete concentrated urine to compensate for the water loss. They also have gills to help excrete excess salts. Conversely, freshwater fish absorb salt from their surroundings using their gills and their bodies reabsorb salt from their urine. This describes how salt- and freshwater fish _______.
a.
use their gills to drink
b.
keep the salinity levels even in their aquatic environments
c.
have adapted to deal with osmosis
d.
have evolved behavior patterns to match their physiology
Answer:
c
Explanation:
it is c
what is the purpose of the cell organelles?
Which of the earth's spheres contains its plants and animals? atmosphere biosphere hydrosphere lithosphere?
Answer:
biosphere
Explanation:
Grasses → mice → cat → coyote a natural disaster of a fire has occurred what could happen to this food chain?
How independent assortment occurs in cells?
Genetic variations may result from which of the following? CHOOSE ALL THAT APPLY.
Question 1 options:
Genetic recombination during meiosis.
Errors occuring during DNA replication.
Mitosis producing 2 identical daughter cells.
Cell differentiation, which leads to genetic variation.
Mutations caused by environmental factors.
Which statement explains the difference between a nerve that is connected to the skin and a nerve that is connected to a muscle?
The nerve that is connected to skin is a motor neuron; the nerve that is connected to a muscle is a sensory neuron.
The nerve that is connected to skin receives stimuli information from the external environment; the nerve that is connected to a muscle receives processed stimuli information from the brain.
The nerve that is connected to skin is part of the central nervous system; the nerve that is connected to a muscle is part of the peripheral nervous system. The nerve that is connected to skin helps the body maintain homeostasis; the nerve that is connected to a muscle supports the body so it can stand upright.
The right answer is B. (the second one).
Sensory information is detected by peripheral sensory receptors (such as those at the skin) and is transmitted to the central nervous system via sensory neurons, otherwise known as afferent fibers.
The motor nerves carry motor control from the central nervous system to the effectors that are mainly the muscles. These efferent nerve fibers originate in the central nervous system.
A Y-linked disease is a sex-linked disorder found on the Y chromosomes. Who can be afflicted with a Y-linked disease?
a. a female offspring if her father has it
b. a female offspring if her mother has it
c. a male offspring if his mother has it
d. a male offspring if his father has it ...?
the answer is letter D or the last one
Which of the following is an organic molecule?
A. Fructose
B. Nitrogen gas
C. Hydrogen sulfide
D. Water
Answer:
A
Explanation:
According to the fossil record, five ________________ took place, which lowered the variety of species found on Earth today.
Answer:
Mass Extinctions
Explanation:
explain importance of osmosis in the production of urine in the kidney nephron
In which stage do vertebrate embryos or offspring show the most similarities?
A. Earliest stages
B. Middle stages
C. Just before birth
D. After birth
Answer:
Option B. Middle stages
Explanation:
During early stages of development, all the embryos are quite similar to each other. Embryos of different organism such as human being, fish etc. share common look alike at certain developmental stages because they all have originated from a common ancestor
However, the maximum similarity arises in the middle of embryonic development stage particularly known as phylotypic stage
Hence, option B is correct
Answer:
middle stages
Which does NOT represent one of Koch’s postulates?
A. isolate germs from an infected animal
B. grow germs in a lab culture
C. inject germs into a healthy animal
D. watch to determine how long it takes for the healthy animal to become ill
What occurs when a muscle becomes weaker and smaller from not being used?
Answer
gets stronger
atrophy
weight gain
turns to fat
...?
What is the function of osteocytes?
What effect will a virus in the lytic cycle have on an organism? A. It will have no direct effect on the organism. B. It will cause a disease in the organism. C. It will spread bacteria in the respiratory system. D. It will cause genetic mutations in sex cells.
The effect that a virus in the lytic cycle will have on an organism is that it will cause a disease in the organism.
WHAT IS LYTIC CYCLE?Lytic cycle is one of the two stages of infection of a virus in a host cell. The lytic cycle involves the bursting of the host cell to release new virions.
The virus infects a host cell and uses its replication mechanism to form new cells.
The virus causes diseases in the cell of the host organism.
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Why is it important for the cells of multi-cellular organism to undergo mitosis?
In the hills of north carolina, several different species of wrens live in one large pine tree. this is possible because the wrens
Answer:
b)
Explanation:
Which of the following is NOT true of greenhouse gases?
a.
They absorb Earth’s radiation.
b.
They are produced solely by human activities.
c.
They are transparent to incoming solar radiation.
d.
They include carbon dioxide and water vapor.
Some greenhouse gases are created by natural processes as well. Methane gas is an illustration of this, and it is created by farming and cattle. Thus, option B is correct.
What is the effect of greenhouse gases in ecosystem?The consequences of greenhouse gas on the environment and human health are extensive. They aid in the smog and air pollution-related respiratory sicknesses and climate alteration by trapping heat.
Other consequences of climate change attracted on by greenhouse gases consider extreme weather, interruptions in the food activity, and a modification in wildfires.
By confining heat, they contribute to climate happening and respiratory illnesses brought on by smog and air impureness.
Other effects of climate modification pulled on by greenhouse gases consider extreme weather, interruptions in the food supply, and a modification in wildfires.
Therefore, They are produced solely by human activities.
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In soils with distinct soil horizons, the bottom zone is the..... a.) parent material b.) a horizon c.) b horizon d.) subsoil
The correct answer is option (a). Parent material
The soil horizon refers to distinct layers of the soils, which are parallel to one another, but have a different composition from the layer present above and below to it.
The soil horizon can be divided into four different layers. First one is organic layer, which is the topmost layer, below this layer second layer of topsoil is present. Below top soil, subsoil is present. Below subsoil, the bottom most horizon parent material is present.
How does RNA differ from DNA?
A. RNA contains uracil and deoxyribose
B. RNA contains ribose and thymine
C. RNA contains uracil and ribose
D. RNA contains uracil, thymine, and ribose
DNA and RNA differ in their structure and function. DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil. RNA transmits genetic information from DNA to proteins.
Explanation:The key differences between RNA and DNA are found in their structure and function. DNA (Deoxyribonucleic Acid) contains deoxyribose sugar, has thymine as a base (along with adenine, guanine, and cytosine), is double-stranded and primarily functions as the storage material for genetic information.
On the other hand, RNA (Ribonucleic Acid) has ribose sugar, contain uracil instead of thymine (the other bases are adenine, guanine, and cytosine), is single-stranded, and serves as the intermediary in the process of converting genetic information from DNA into proteins. Thus, the correct answer is: C. RNA contains uracil and ribose.
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Populations of predators increase when populations of prey are high because