Proteins serve a variety of functions in living organisms. Which of the following protein-containing substances plays a role in defense?
choices:
muscles
hair
antibodies
hormones
Answer:
hair
Explanation:
Answer:
A. Muscles
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Explanation:
What is the estimated volume of water that covers the Earth?
33 million cubic miles
330 million cubic miles
33 thousand cubic miles
330 thousand cubic miles
The correct answer is - 330 million cubic miles.
The Earth is dominated by water, which surpasses the land area by far. This water also has a great volume, with the estimates being around 330 million cubic miles.
Most of the water is a salt water, with approximately 97.5% of the total volume of the water on the planet, and only 2.5% being fresh water. What's even more interesting is that out of those 2.5% of fresh water, only 0.3% are actually in liquid form, while all the rest is frozen, mostly on and around the poles of the planet.
Which of the following best describes how crossing over occurs during meiosis?
A. During prophase I, homologous chromosomes are lined up and pulled apart to opposite poles.
B. During prophase I, segments of chromatids are exchanged between homologous chromosomes.
C. During prophase II, chromosomes overlap and sections of each chromosome switch places.
D. During prophase II, sister chromatids trade places with each other before metaphase begins.
Crossing over occurs during the Prophase I stage of meiosis, where segments of chromatids are exchanged between homologous chromosomes, generating genetic diversity. The correct option is option b.
The process of crossing over occurs during meiosis, specifically in Prophase I.
This stage is crucial for creating genetic diversity. Option 'B' captures this best: During prophase I, segments of chromatids are exchanged between homologous chromosomes.
During this exchange, similar sections of DNA on these chromosomes swap places,
leading to the creation of new gene combinations which ultimately increase genetic diversity in offspring.
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Birds have hollow bones. explain how this is adaptive.
How can disruptions in the cell cycle lead to cancer?
cells are alive, but not all living cells are organisms.explain
Mitosis produces which cell type?haploiddiploidchromosomegamete
Mitosis produces diploid cells, which are identical to the parent cell. These cells are crucial for growth, repair of tissues, and asexual reproduction. In contrast, meiosis creates haploid cells or gametes needed for sexual reproduction.
Mitosis is a process of cell division that produces two identical daughter cells from a single cell, each maintaining the diploid state of the parent cell. In other words, through mitosis, a cell divides into two cells, each with the same number of chromosomes as the original cell. This process allows for growth, repair of tissues, and asexual reproduction in organisms.
On the contrary, meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes of the original cell. These are known as haploid cells which are often referred to as gametes or sex cells. These cells are essential for sexual reproduction because when two gametes combine during fertilization, they restore the diploid state.
Summing up, mitosis produces diploid cells whereas meiosis generates haploid cells.
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what part of a phospholipids is charged or polar
What allows humans to have different traits from each other?
A. They have different numbers of chromosomes.
B. They have different genes.
C. They store DNA in different places.
D. They have different haploid numbers.
B. They have different genes.
What are the four reasons why cells divide
Cells divide for growth of an organism, repair of damaged tissues, maintenance of healthy tissues, and regulation to prevent the propagation of damaged cells due to accumulated mutations.
Cell division is a critical process in all living organisms, and it occurs for several fundamental reasons that are essential for life. Here are four reasons why cells divide:
Growth: From the development of an embryo to an adult organism, repeated cell division allows for the continuous growth of the organism. A single fertilized egg, or zygote, divides multiple times to produce the vast number of cells required to form a mature multicellular organism.Repair: Cell division is necessary to repair damaged tissues, such as healing a cut on the skin. It allows for the replacement of damaged or worn-out cells, ensuring optimal function of tissues and organs.Maintenance: Even after an organism has fully grown, cell division continues to replace old and worn-out cells to maintain healthy tissue function.Mutation Regulation: Cells are programmed to divide a certain number of times. Accumulation of mutations can damage DNA, and cell division is regulated to prevent propagation of damaged cells.In summary, cell division is a key biological process that allows for growth, repair, maintenance, and the regulation of cell lifecycle, ensuring the health and sustainability of life.
Which vegetable is in chicken divan: asparagus or corn or broccoli?
what A hypothesis that two organisms from different species are related to each other is best supported by?
The relationship between different species can be supported by their similar DNA sequences and homologous structures, following the principle of maximum parsimony. These genetic and morphologic evidences are crucial in modern taxonomy for determining evolutionary relationships.
Explanation:A hypothesis that two organisms from different species are related to each other is best supported by evidence that their DNA sequences are highly homologous. This means that the genetic material of the two species has many similarities, indicating a close evolutionary relationship.
Additionally, scientists look at homologous structures, which are physical features that are similar due to evolutionary origin, rather than analogous structures, which may look similar but are not derived from a common ancestor. The concept of maximum parsimony also plays a role, suggesting that organisms with more homologous structures are more closely related evolutionarily. In modern taxonomy, scientists often refer to the "tree of life" to explain phylogeny or the evolutionary relationships among species. All branches on this tree originate from a single trunk, which represents the common ancestor of all life forms.
Vertebrates that are warm blooded, have feathers and reproduce by laying eggs would be classified as _______
Answer:
Class - Aves, examples birds.
Explanation:
Birds are vertebrates that are included in the class aves. Their body is covered with feathers. Have wings for flying. They are warm blooded (endothermic) animals with thin-walled and hollow bones. These bones are denser, stiffer, and stronger. They high metabolic rate to fulfil high energy requirement. They have beak made of keratin. They are oviparous or egg laying vertebrates.
Where is oxygen content in a river or stream likely to be highest?
Which statement explains why oxygen molecules easily diffuse across a cell membrane while glucose molecules do not?
A. Oxygen is polar.
B. Glucose is too big to pass through.
C. Protein membranes block glucose.
D. Oxygen is a gas.
Answer:
Glucose is too big to pass through
Explanation:
Membrane proteins are among the most important proteins biologically because they allow the cells to communicate with their environments. These membrane proteins are responsible for ALL BUT which process?
A) triggering ion channels
B) identifying foreign cells
C) regulating intake of oxygen
D) activating growth hormone reactions
Membrane proteins are the proteins responsible for the interaction with the biological membrane. It is associated with triggering ion channels, identifying foreign cells, and activating growth hormone reactions.
What are the functions of membrane proteins?Membrane proteins have a large number of functions, including the following:
It helps cells to communicate with each other.Maintain the shape of cells.Work according to the changes done by chemical messengers.Transport and share the material through the cell membrane.Activate several reactions.It is not involved in regulating the intake of oxygen.
Thus, the correct option is C.
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Why do the atoms in the top rows in the Periodic Table have higher electronegativity than atoms in lower rows?
The electrons of those atoms are farther from the nucleus.
The electrons of those atoms are closer to the nucleus.
The electrons of those atoms are part of the nucleus.
When there is unequal sharing between two atoms of the electrons in a bond, which type of bond is it?
polar covalent
electronegative
ionic
nonpolar covalent
Answer:
For 1: The correct answer is the electrons of those atoms are farther from the nucleus.
For 2: The correct answer is polar covalent.
Explanation:
For 1:Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The size of an atom increases as we move down the group because a new shell is added and electron gets added up.
As, the size of an element increases, the valence electrons gets away from the nucleus. So, the attraction between the nucleus and the shared pair of electrons.
Hence, the correct statement is the electrons of those atoms are farther from the nucleus.
For 2:A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the unequal sharing of electrons between the atoms.
An electronegative atom is the one which attracts the shared pair of electron towards itself.
Ionic bond is formed when there is complete transfer of electron from one atom to another atom.
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the equal sharing of electrons between the atoms.
Hence, the correct answer is polar covalent.
During a spring tide, which phases could the Moon be in? Select all that apply. A. full B. new C. first quarter D. third quarter
explain why the ptolemaic theory seems logical based on daily observations of the rising and setting sun. ...?
The diagram shows the stages of the eukaryotic cell cycle.
Which stage is labeled E in the diagram?
mitosis
interphase
S phase
G0 phase
The right answer is interphase.
In both eukaryotic and prokaryotic cells, the interphase is the period of the cell cycle that is characterized by an increase in cell volume, the cell transcribes its genes and the chromosomes are duplicated. It can be subdivided into several phases:
* phase G1 (growth or gap), during which the cell grows and performs the functions for which it is programmed genetically: biosynthesis of proteins, etc. It is during this phase that the young, freshly divided daughter cells grow to their final size.
* phase S (of the English synthesis, because of the synthesis of new DNA molecules), during which the chromosomal material is doubled by DNA replication. This is called chromosome duplication.
* phase G2, where the cell prepares to divide into two daughter cells. At the end of this phase, each chromosome is perfectly identical to its homolog in terms of morphology and from the point of view of the genes present, but each gene is not necessarily identical to its homologue, since generally several alleles exist.
** There is also the G0 phase, which is one of reproductive senescence. It is a possible exit from the control point at the end of G1, an alternative to the continuation of the G1 phase and the transition to the S phase. The G0 phase can be temporary or permanent and it is often induced by unfavorable conditions.
Answer:
The correct answer would be interphase.
The cell cycle is mainly divided into two phases: mitosis (M) and interphase.
Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.
It can be sub-divided into three stages:
Gap 1 (G₁) phase which is represented by letter A in the given diagram. Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram. Gap 2 (G₂) phase which is represented by letter C in the given diagram.Letter D represents mitosis (M) phase in which the actual division of the cell takes place.
Bryophytes are also called
What makes science different from other ways of study? A. Only science has theories B. Science is based on evidence 3. Science is based on art D. Only science studies only supernatural events
Final answer:
Science is different from other ways of study because it is based on evidence and is limited to what can be observed and measured. It involves testing new ideas with experiments and observations, making its conclusions reliable and factual. So the correct option is B.
Explanation:
Science is different from other ways of study because it is based on evidence and logic. Science distinguishes itself by its systematic approach to gaining knowledge about the natural world through the use of observations, reasoning, and repeated testing. This process starts with a question, which scientists attempt to answer with empirical evidence and sound reasoning.
Unlike other fields of inquiry, science deals only with things that can be observed and measured. Phenomena such as supernatural beings or events are beyond the scope of science because they cannot be observed or tested with current scientific methods. Furthermore, science is continually evolving, as its ideas are open to revision and must withstand rigorous scrutiny and experimental verification.
In contrast to other disciplines that might rely on subjective interpretation or untestable beliefs, science requires that any new ideas be testable by experiments or observations. This makes its conclusions reliable and objective. As such, areas of knowledge like morality, aesthetics, or spirituality are considered beyond the realm of scientific inquiry. They are part of what is often termed 'nonscientific' or 'metaphysical' realms.
This is the circulation of water between land, air and surface.
Deep-ocean lantern fish have special organs that use chemical energy to produce light. However, the light can only travel a certain distance through the water before it is no longer visible. How does this phenomenon validate the Law of Conservation of Energy?
The fish is a closed system, so energy is allowed to exit the system.
The Law of Conservation of Energy applies to biological, not physical, systems.
The light energy travels through the water until it is reflected or absorbed.
The light is not carried by matter and contains no energy.
Answer:
The correct answer is that the light energy travels through the water until it is reflected or absorbed.
Explanation:
The law of conservation of energy is illustrated as the form of energy that cannot be destroyed or produced, however, it gets transformed from one form to another. In case of Deep Ocean lantern fish that generates light in water, which travels along certain distance and then moves back, that is, in the reverse direction. This happens as the light travels in waves and when it comes in contact with the waves, it either gets absorbed or is reflected back.
Which of these is NOT on the electromagnetic spectrum?
A. radio waves
B. visible light
C. sound waves
Final answer:
Radio waves and visible light are both on the electromagnetic spectrum, but C. sound waves are not. Sound waves are mechanical waves, unlike radio and visible light, which are categories of electromagnetic radiation.
Explanation:
The electromagnetic spectrum comprises a range of electromagnetic radiation types, each categorized by their wavelength or frequency. Among these, radio waves and visible light are two different categories. Radio waves fall on the low-frequency side of the electromagnetic spectrum, having much longer wavelengths than visible light. In contrast, visible light falls within the narrow violet-to-red range of the spectrum that we can see with our na_ked eyes and is used in a variety of applications, from photosynthesis to detecting the vibrant colors of sea life.
However, sound waves are not a type of electromagnetic radiation; they are mechanical waves that require a medium to travel through, such as air or water. Thus, the correct answer to the question 'Which of these is NOT on the electromagnetic spectrum?' is C. sound waves.
when a person loses consciousness due to head injury what keeps the body functioning
Answer:
Autonomous nervous system
Explanation:
When a person is unconscious due to head injury, but the autonomous nervous system of the body keeps the body function normal by ensuring the flow of information between the brain and the rest of the body part.
The autonomous nervous system is the part of the nervous system of the body that is not controlled by our will but it works in the background in order to make sure that the body functions normally during an emergency.
Which law best describes why the planets are pulled toward the Sun and orbit it?
Answer:
The right answer to this question is: Newton's first law, the Law of Motion.
Explanation:
This law describes why the planets are pulled toward the sun in a very simple way. Every body in motion will continue like that, until another one interfers this process.
But in this process, we need to remember that the sun is very big, and bigger the body, bigger the gravity to pull the bodies around it towards it. The sun is very big, and this is how the planets keep moving around it.
The oceans were formed during the original accretion of the Earth
True or False
The answer is false! :) Just took the test. ;D
A formal tone is most appropriate to use in
The correct answer on edgenuit.y is essays.
(I just took the quiz)
Answer: essay
Explanation:
A formal tone is most appropriate to use in essay
Which piece of bubble gum blows the biggest bubble?
The average size bubble blown using Dubble Bubble bubble gum was 3.7 inches. Hubba Bubba's average bubble was 3.3 inches, Bazooka's was 3 inches. Bubblicious had an average bubble of 2.7 inches and Bubble Yum was close behind with an average bubble of 2.6 inches.
So if you want to blow a big bubble Dubble Bubble bubble gum is the gum for you