Part A
Luster refers to the way that an object, such as a mineral, reflects light. The luster may be metallic or nonmetallic. A
mineral with a metallic luster may look golden or silver. A mineral with a nonmetallic luster may look adamantine
(transparent and sparkly like a diamond), pearly, vitreous (glassy), waxy, silky, resinous (like honey), or greasy. Nonmetallic
minerals with little or no luster tend to have an earthy, dull look.
Examine all the mineral samples in your kit one by one to determine if they have a metallic or a nonmetallic luster. Some
minerals may be only partially lustrous. Hold them up to the light and look on all sides for an accurate observation.
Classify each mineral as metallic or nonmetallic in the table.
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Metallic Luster
Nonmetallic Luster
Answer:
magnet and copper penny= metallic
water= not metallic
Explanation:
Magnet and Copper penny are metallic
Water is not metallic
What is metallic luster?
Metallic luster refers to minerals that are opaque, translucent, and have the appearance of polished metal for example coins, gold nuggets, and copper,
What is non metallic luster?
Several kinds of nonmetallic luster are: adamantine has extreme brilliance like a faceted diamond. Examples are diamond and red sphalerite. dull lacks glossiness and appears earthy like soil or clay.
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In a study of a muscle disorder, several families exhibited vision problems, muscle weakness, and deafness. Analysis of the mtDNA (mitochondrial DNA) from affected persons in these families was analyzed using PCR (polymerase chain reaction) and gel electrophoresis. The unaffected samples were collected from multiple mitochondria, whereas each affected sample was collected from a single mitochondrion. What can you conclude about the affected individuals' mitochondrial DNA?
A. There is no common deletion.
B. There is one common deletion.
C. There are two common deletions.
D. There are more than two common deletions.
Answer:
A. There is no common deletion.
Explanation:
The correct answer to the given question is the option A. There is no common deletion.
In the study of the muscle disorder, the samples taken and the effects observed concludes that there was no common deletion among the analysed families and their mitochondrial DNA.
1-In mice, the ability to run normally is a dominant trait. Mice with this trait are called running mice (R). The recessive trait causes mice to run in circles and we call these waltzing mice (r). Hair color is also inherited. Black hair (B) is dominant over brown hair (b).
If a mouse is h0m0zygous running and heter0zygous for hair color, its genotype is
______.
Answer:
is it like in different groups? like group (r)
The Cambrian explosion was
Answer:
It was the sudden appearance (over a 10my period) of many different organisms, which occurred approx 540-548 mya. ... So it can be away from sources of oxygen, preventing microorganisms from decomposing the organism.
Margo notices that waves start passing her more often. What can she conclude about the frequency and wavelength of the waves?
Maro concluded that the frequency is increased while the wavelength would be decreased with respect to the wave that starts passing her more often.
What is Wavelength?Wavelength may be characterized as the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The frequency or the energy of the wave is inversely related to the wavelength of any wave. This is because when frequency increases, wavelength (λ) decreases, and vice-versa. While the energy of the wave and frequency is directly related to one another.
Therefore, Maro concluded that the frequency is increased while the wavelength would be decreased with respect to the wave that starts passing her more often.
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Please please help ASAP
Choose the letter if the best answer
2. The Doppler effect caused an apparent
A.loudness
B. Intensity
C. Pitch
D.resonance
3. Beats result from
A.reflection
B. Refraction
C. Diffraction
D. Interference
4. The hammer, anvil, and stirrup are in the
A.outer ear
B. Middle ear
C. Inner ear
D. Cochlea
5. Sonar is used to find
A.time
B.speed
C.angle of reflection
D distance
Answer:
The answers to:
Question 2: C
Question 3: D
Question 4: C
Question 5: C
Which factor is most important for photosynthesis to occur in plants?
O A. soil pH
O B. air temperature
o C. amount of sunlight
D. water temperature
Answer:
c amount of sunlight
Explanation:
hope its right
Answer:
Explanation:
D
Species that only use asexual reproduction only develop new genetic combinations through the process of mutation.
A. True
B. False
Yes, this is true, because in asexual reproduction there is very little genetic diversity, except in the case of a mutation.
What the answer to these if there wrong or correct check pls
Answer:
the second one is false
Explanation:
If the DNA integrates properly into the germ cells, the adult fly will contain _________________ that contain _____________________________. After mating, these flies can then produce progeny that will contain ______________________.
Answer:
Five pairs of autosomal and one pair of heterochromatic sex chromosomes.
Explanation:
The adult fly will contain 12 number of chromosomes that contain five pairs of autosomal and one pair of heterochromatic sex chromosomes. After mating, these flies can then produce progeny that will contain diploid i. e. double number of chromosome. One set of half chromosomes from the male fly while the other half chromosomes comes from female fly so the offspring will receive double number of chromosomes.
Earth's magnetic poles reverse approximately every _____ years?
O A. billion
B. 22
C. 10 million
D. 250,000
Answer:
D. 250,000 years
Explanation:
It's really 200,000 to 300,000 years, but 250,000 years is right in the middle, so it must be 250,000 years.
Hope this helps you! Good luck with your exam/quiz! <3
Answer:
D) 250,000 yrs.
Explanation:
Earth's magnetic poles reverse approximately every 250,000 years.
A student is performing an investigation using rennin and milk. Rennin is an enzyme that can solidify milk. She
puts milk in three test tubes with rennin and places the tests tubes in water baths at different temperatures
of 32°F, 98°F, and 212°F. She notices the rennin enzymes become denatured at 212°F and do not solidify
the milk. Which statement correctly describes the effect of the denatured enzymes?
A. Denatured enzymes are slowly active.
B. Denatured enzymes are no longer active
C. Denatured enzymes reverse the reaction.
D. Denatured enzymes speed up the reaction.
Answer:
The correct answer is - option B. denatured enzymes are no longer active.
Explanation:
Denaturation of the enzymes or proteins results in changes in their original structure which ultimately results in the loss of their particular functions. The denaturation of proteins or enzymes takes place due to extreme temperature or pH which leads to a change in the active site of an enzyme.
Due to this change, the substrate will no longer fit in the active site and become inactive as enzymes work together with the substrate and the active site is the essential part of the enzyme for its activity. In this case, this is condition takes place which makes it denatured at 212 degrees F.
what will happen if nondisjunction wee to take place at anaphase 2
I need help help me please
Answer:
50
Explanation:
IF DNA STRAND #1 IS AGC WHAT IS STRAND #2
Answer:
The second strand is TCG
Explanation:
what are the main functions of the skelatal system
Answer:
The skeletal system works as a support structure for your body. It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.
Explanation:
Explain what factors can lead to genetic
variation within a population.
Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Hope this helped :)
genetics and the environment both play roles in cell differentiation. which is the best example of an environmental factor influencing cell differentiation
Answer: etiolation of plant growth in shade, with fast growing cell without chloroplasts. Out of shade, cell differentiate again to produce photosynthesising cells
Explanation: It is a subjective decision as to what is ‘best’. Good examples are plant responses to changes in the nutrient supply.
when soil nitrogen is depleted some plants, such as legumes, grow nodules on their roots, with cells that release chemical signals to attract nitogen fixing bacteria.
Lack of light induces etiolation in many plants. New cells elongate and develop without chloroplasts, with rapid cell division exhibiting gravitropism, extending upward. When they grow beyond the shade area, cell differentiation changes again, to produce photosynthesising cells.
Which of these are components of DNA? Select five options.
deoxyribose sugar molecules
ribose sugar molecules
adenine
phosphate molecules
ribosome
cytosine
thymine
Answer:
deoxyribose sugar moleculesphosphate moleculescytosine thymineadenineAnswer:
phosphate
adenine
cytosine
thymine
deoxyribose sugar molecules
these are the components or dna
what is heat? please help
Answer:
I am pretty sure its thermal energy but you might have to check that
Heeeeeelp please
Answer and I will give you brainiliest
Explanation:
Such an offspring would have the genotype YY, which are the dominant alleles that code for yellow colour in bananas.
In the Punnett's Square, none of the offspring have YY genotype. Hence the answer is 0%.
Which kind of energy propels a sailboat? A) chemical energy , B) electrical energy, C) mechanical energy, D) thermal energy
Answer:
It is C or D but most likely C
Explanation:
Animal and plant cells have all of the following EXCEPT
A. chloroplasts to carry out photosynthesis.
B. vacuoles to store water and nutrients.
C. a nucleus with DNA to replicate cells.
D. mitochondria to form chemical energy.
Answer:
The answer is A, chloroplasts to carry out photosynthesis.
Explanation: The animal cell does not have photosynthesis.
Animal and plant cells have all of the following EXCEPT - A. chloroplasts to carry out photosynthesis.
Chloroplasts are the cellular membrane-bound organelle that is specific to the plant cell and does not found in animal cells. Chloroplast carried out the process known as photosynthesis.
In these organelles, photosynthetic pigment chlorophyll found that captures the energy from sunlightMitochondria are also membrane-bound organelle found in all eukaryotic cells including animal and plant cells to carry out cellular respiration.The nucleus is also present in both types of the eukaryotic cell, plant and animal cell that stores genetic material.Vacuoles are present in the eukaryotic cells, to store water and nutrients.Thus, Animal and plant cells have all of the above EXCEPT - A. chloroplasts to carry out photosynthesis.
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The body of young mother has been discovered behind a dumpster. She was last seen 14 hours ago. Her body is in full rigor mortis. What can you conclude ?
A. She died shortly after she was last seen.
B. She died approximately one hour ago.
C. She died approximately 2-6 hours ago.
D. She died approximately 8-10 hours ago.
Answer:
A. She died shortly after she was last seen.
Explanation:
Answer:
C
Explanation:
Actually, rigor mortis sets in about 2-6 hours after death. This means she must have gone MISSING 14 hours ago, but DIED 2-6 hours ago. This means the answer is C.
Stress is a nondietary risk factor for
cancer
hypertension
osteoporosis
diabetes
I would say hypertension, I think stress can be a risk factor for this.
Answer:B
Explanation:
Dehydration synthesis leads to formation of -------
1)polymers
2)monomers
3) water and polymers
4)none of the above
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What evidence does the diagram provide that humans and kangaroos have evolved from a single common ancestor? (3)
Answer:
Their backbones and chest bones are same.
is the study of how traits are passed from parents to offspring.
OA) Fertilization
O B) Genetics
O C) Seed production
O D) Selective breeding
Answer:
D) Selective
breeding
Explanation:
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Which layer of the earth is described as "plastic", allowing plates on the
crust to move?
A. oceanic crust
B. asthenosphere
D. lithosphere
C. core
Answer:
A. oceanic crustExplanation:
The asthenosphere is plastic is made of oceanic crust. The lithosphere is plastic and is made of the upper part of the mantle. ... These plates are large portions of lithosphere that move slowly over the more fluid, underlying material in the region below the crust.
Hi" I hope it's help you"
Answer:
B asthenosphere
Explanation:
the answer is asthenosphere!!
The figure below shows an experiment on photosynthesis. Rebecca observed that the part of the leaf outside the bottle showed the presence of starch in it. The part of the leaf inside the bottle did
not show the presence of starch. When the same experiment was repeated without potassium hydroxide (KOH) in the bottle, the whole leaf showed the presence of starch.
KOH
Water
What can Rebecca correctly infer about potassium hydroxide?
SC.912.L.18.9
It absorbs carbon dioxide.
It releases oxygen.
Ο Ο Ο Ο
It produces water
It dissolves cells.
Answer:It releases oxygen
Explanation: I took the test