Aims of Crop Improvement
To improve the quality of produce.
To increase crop yield.
To adapt crops to adverse climatic conditions.
To induce resistance to pests and diseases in crop plants.
To conserve land resources.
To breed crops with uniform growth and maturity.
To meet particular needs of growers and consumers.
Which phase in the cell cycle consists of the cell readying itself for its division?
A. Prophase
B. Interphase
C. Anaphase
D. Metaphase
Answer:
interphase
Explanation:
this is the resting stage where the cell grows and gets ready for division
Answer:
interphase
Explanation:
Assume new techniques are developed with permit removing from a cell any desired parts or materials without killing the cell. If the centrioles were removed from a cell, the cell would then not have:_______
a. Chromosomes
b. Mitochondria
c. Spindle fibers
d. Ribosomes
Answer:
c. Spindle fibers
Explanation:
In eukaryotic cells, the centrioles are small sets of microtubules composed of tubulin proteins. Moreover, in animal cells, a centrosome is an organelle localized near the nucleus which contains a pair of centrioles. These organelles (centrosomes) are referred to as microtubule-organizing centers. During Anaphase, centrioles move to opposite sides in the cell in order to organize the spindle fibers and separate the chromosomes during cell division.
Regional erosion occurs at a rate of 2 m per 1,000 years.
How much regional erosion will occur over 100,000 years?
A) 20 m
B) 200 m
C) 2,000 m
D) 100,000 m
Answer:
c
Explanation:
Answer:
c
Explanation:
Suppose that Rosie and Ross are both carriers for PKU (a rare autosomal recessive disease.) If they have eight children, what is the probability that all of eight children will have the same phenotype?
Answer:
1/65,536 = 0.001523 %
Explanation:
A: normal allele
a: recessive allele causing PKU
The probability that Rosie and Ross have one child with PKU will be >>
Aa x Aa = 1/4 AA; 1/2 Aa; 1/4 aa
In consequence, the probability that Rosie and Ross have eight children with PKU will be >>
(1/4)⁸ = 1/65,536 = 0.001523 %
If Rosie and Ross are carriers of PKU, if they intend having 8 children, the probability that they will all have the same phenotype is: [tex]\mathbf{\frac{1}{65,536}; 0.001523 \%}[/tex]
Given that Rosie and Ross are both carriers of the recessive disease, it means that for the disease to manifest itself, two recessive alleles must be present in an allelic pair.
Using P and p to denote the dominant and recessive alleles respectively, we have the following gene of both parents:
Rosie - PpRoss - PpThe cross between both parents has been provided using a Punnett square as shown in the attachment.
The cross shows that, for any cross between both parents, there is [tex]\frac{1}{4}[/tex] probability that the child would have the phenotype, pp, which means the child would have the are autosomal recessive disease.
Therefore, the probability for for 8 children having the same phenotype will be:
[tex]\frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} = \frac{1}{65,536}[/tex]
This is also approximately: [tex]\frac{1}{65,536} \times 100 = 0.001523 \%[/tex]
Therefore, if Rosie and Ross are carriers of PKU, if they intend having 8 children, the probability that they will all have the same phenotype is: [tex]\mathbf{\frac{1}{65,536}; 0.001523 \%}[/tex]
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Which of the following is a type of natural disaster that has impacted Florida? (3 points)
What do we use natural gas for? (What products and services does it facilitate?)
Natural gas is a non-renewable hydrocarbon used as a source of energy for heating, cooking, and electricity generation. It is also used as a fuel for vehicles and as a chemical feedstock in the manufacture of plastics and other commercially important organic chemicals.
hope this help! ^^
Which characteristic is most suitable to use to create a question for a dichotomous key?
whether an organism is eating
whether an organism is flying
whether an organism is striped
whether an organism is pregnant
Answer:
C
Explanation:
In general, the land changes temperature much more rapidly than the
ocean. How does this fact explain the existence of land breezes and sea breezes?
Answer:
Answer
Explanation:
Sea breezes occur during hot, summer days because of the unequal heating rates of land and water. During the day, the land surface heats up faster than the water surface. Therefore, the air above the land is warmer than the air above the ocean.
What do all organisms need? Select three options.
O nervous system
O a place to live
O blood
O water
O food
Answer:
Explanation:
A place to live water and food is the correct answer
The three selected options are place to live, water and food.
What is biological need?
The physical conditions needed for survival of organisms are referred to as biological needs. The same applies to human body which cannot operate and will ultimately fail if these conditions are not satisfied.
All organisms really want five things for survival: fresh air, clean water, food, shelter, and sleep.
Biological needs are important because they are essential to survival. Without air, sunlight, food, water, shelter, sex etc. organism cannot or it is hard to survive.
Thus, the three selected options are place to live, water and food.
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why would a policy of allowing only one child per family lead to reduction in the population
in all what caused the earths temperature to rise by 10 degrees??
Answer: Global Warming
Explanation: Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels. ... Temperatures are certain to go up further. Despite ups and downs from year to year, global average surface temperature is rising.
If genes are on different chromosomes, the Law of Independent Assortment states that -
A) gene pairs always stay together
B) half an organism's gametes have allele per pair
C) gene pairs segregate randomly and independently for each other
D) one allele is always dominant
Activity 1C, page 2 soil cross
In lab this week we looked at different animal cells. Each of those cells has unique characteristics. Below I have a list of cellular characteristics. List which cell has the listed characteristic. Your options are: cartilage cells, neurons, red blood cells, skeletal muscle cells, or white blood cells.
Extensions
Matrix
No nucleus
Striated
Used in the immune system
Answer:
Red blood cells have no nucleus
White blood cells are used in the immune system
Skeletal muscle cells are striated
Cartilage cells make up the cartilage matrix
and Neurons have extensions
Hope this helps
List what body systems perform the following life processes- growth, respiration, nutrition. What organelle performs nutrition, reproduction, and growth? How does the excretory system work together with the respiratory system?
Answer:
for respiration lungs,nose
for nutrition mouth and stomach
for reproduction various reproduction organs like penis and vagina
growth -
excretory - skin(sweat) ueltra blader kidney liver
Explanation:
______ form the bulk of the cell structure and most functional molecules
A protein
B molecules
C fats
D vitamins
Answer:
A protein
Explanation:
A DNA sequence that is responsible for the initiation of transcription in a cell-type specific manner is:_____.
Answer:
Promoter.
Explanation:
It is promoter because Promoter is a DNA sequence where's the gene transcription begins. It is the
DNA sequence which RNA polymerase binds or join to
so as to begin transcriptionn of a gene . It is a region where the regulatory elements i.e protein will bind to and the Promoter sequences are found directly upstream or at the end of 5' of the transcription initiation site. This can also encode RNA such as mRNA, trans and so on.
A small percentage of the body’s iron supply circulates freely in the blood, bound to a protein called transferrin. Transferrin binds to specific proteins on the surfaces of a cell's plasma membrane. The cell then ingests the transferrin by forming a pit, which becomes a vesicle. Which of the following BEST describes how transferrin is transported across the plasma membrane? A. exocytosis B. pinocytosis C. phagocytosis D. receptor-mediated endocytosis
Answer:
What best describes how transferrin is transported through the erythrocyte plasma membrane is receptor-mediated endocytosis.
Explanation:
The incorporation of transferrin across the erythrocyte membrane depends on a transferrin receptor expressed on the surface of the membrane. The specific receptor recognizes the presence of iron-charged transferrin, transferin diferrica, incorporating it into the cell by endocytosis. Once in the cytoplasm, the iron is dissociated from the transferrin.
Free transferrin is called apotransferrin. The transferrin receptor has a high affinity for transferrin di-ferrica, which facilitates its incorporation by endocytosis, and the release of apotransferrin into the extracellular space.
The other options are not correct because:
A. Exocytosis implies the exit of substances from the cell.
B. Pinocytosis involves the invagination of the membrane to incorporate soluble substances into the cell.
C. Phagocytosis is the incorporation of solid substances by invagination of the membrane.
Which of the following best describes how does latitude affect biomes?
Latitudes affect how much rainfall a biome will receive.
Lower latitude biomes will always have high temperature.
Higher latitudes produce warm biomes.
Higher latitudes receive less sunlight producing cold biomes.
Answer:
Higher latitudes receive less sunlight producing cold biomes.
Explanation:
Regions with similar climates and plant types are called biomes.
Terrestrial regions may be classified as desert biomes, rainforest biomes, grassland biomes, temperature deciduous forest biomes, tundra biomes, northern coniferous forest biomes, savanna biomes, and mediterranean biomes.
Because these biomes are mostly defined in terms of dominant vegetation or plant species, they are determined by rainfall and temperature. In general, higher latitude biomes are further away from the equator, less sunlight and heat- this results in drier climates with less rainfall and lower, cooler, temperatures.
please help ill give brainliest
Answer:
amoeba: 1 mutation
sponge: 1 mutation
earthworm: 4 mutations
shark: 5 mutations
lizard: 5 mutations
kangaroo: 5 mutations
dolphin: 5 mutations
Explanation:
Explain the relationship among homeostasis, defective mitochondria, and the symptoms caused by LHON.
Answer: The Leber's hereditary optic neuropathy (LHON) is caused by defective genes contained in mitochondrial DNA.
Explanation:
LHON is causes the vision loss. This occurs due to mutation in the mitochondrial DNA. The symptoms are not associated vision loss thus it is difficult to predict that which member of family was the carrier of the disease. Some people do not get completely blind. A young male is expected to develop a risk of 50% development of this disease.
7 point
Which of the following equations has a slope of -3 and a y-intercept of 8?
Оy=3x+8
Оy=3x8
y=8X3
O y=3x*8
Gnnbbc
Answer:
y = 3x + 8 because the y-intercept is always adding if it's positive and and the slope always has the x in the back.
how is this food made and what is the role of microorganism in the production of this food?
Answer:
Nature uses microorganisms to carry out fermentation processes, and for thousands of years mankind has used yeasts, moulds and bacteria to make food products such as bread, beer, wine, vinegar, yoghurt and cheese, as well as fermented fish, meat and vegetables.
Explanation:
Which is the biggest disadvantage of using unipotent stem cells for medical treatment
Answer:
they can make only their own type of cell
Explanation:
A P E X
Answer:
they can make only their own type of cell
Explanation:
Ape-x
what is the type and morphology of Escherichia coli
Answer:
E. coli is a Gram-negative, facultative anaerobe (that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent) and nonsporulating bacterium. Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm3.
E.coli colonies on agar.
E. coli on sheep blood agar.
E. coli colonies
E. coli growing on basic cultivation media.
E. coli stains Gram-negative because its cell wall is composed of a thin peptidoglycan layer and an outer membrane. During the staining process, E. coli picks up the color of the counterstain safranin and stains pink. The outer membrane surrounding the cell wall provides a barrier to certain antibiotics such that E. coli is not damaged by penicillin.Strains that possess flagella are motile. The flagella have a peritrichous arrangement.It also attaches and effaces to the microvilli of the intestines via an adhesion molecule known as intimin.
Explanation:
Which of the following is the most like the Biblical concept of grace:
O A. a wage: something earned
B. a benefit, blessing, standing, or position given without being earned or deserved
OC a reward; something achieved
O D. a woman's name
Answer: B
Explanation:
Grace is the term Christians use to describe God's unconditional love for everyone, whether or not they have behaved as he wants them to. Because God's love is thought to bring redemption , some Christians believe that salvation does not need to be earned through good works.
A granite contains zircon crystals with 275 billion 235U atoms and 1925 billion 207Pb atoms. The half-life for 235U-to-207Pb decay is 704 million years. How old is the granite?
Answer:
The correct answer would be = t = 2.112 billion years
Explanation:
Given:
The number of crystal of uranium = 275 billion
The number of crystal of lead = 1925 billion
The half-life for 235U = 704 million years
Formula using :
N = N0e−λt
where,
no. of daughter atoms = N
at time t= 0, No. of parent atoms = N0.
Time = T
Half life = 0.693/λ
Decay constant = λ
Solution:
by putting value in the formula of the half-life
λ = 0.693/0.704
λ = 0.9844
Now, putting value in the formula for the age of granite.
275 = (275+1925)e^-0.9844 t
1/8= e^-0.9844 t
e^0.9844 t = 8
taking log
0.9844t = 2.07944
t = 2.112 billion years
The granite that contains zircon crystals with 275 billion 235U atoms and 1925 billion 207Pb atoms is 2112 million years old.
From the given information:
the total number of parent atoms is equal to the total number of ²³⁵U atoms
= 275 billion + 1925 billion= 2200 billionNow, from these 2200 billion atoms, 1925 billion of ²³⁵U atoms has changed to Pb²⁰⁷ atoms.
So when the number of half-life is: the parent atom is:
0 2200 billion
1 1100 billion
2 550 billion
3 275 billion
It implies that the parent atoms have passed through three half-life;
Thus, the age of the granite(parent atom) is calculated as:
age of granite = n × [tex]\mathbf{T_{1/2}}[/tex]
age of granite = 3 × 704 million years
age of granite = 2112 million years
Therefore, the age of granite is 2112 million years.
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HEEEEELP NOOOOWWWW its really easy if you understand this type of class
In the root structure there is an area where root cells get older, what is the name of that area?
a
area of getting older
b
area of cell elongation
c
area of maturation
d
apical meristem
Answer:
C. area of maturation
Explanation:
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What geologic forces drive tectonic movements?
Group of answer choices
seismic movement, volcanic activity, plate tension
Earth's rotation, geothermal activity, gravitational forces
plate subduction, convergence and divergence
Earth's orbit, solar winds, electromagnetic waves
Answer:
Earth's rotation, geothermal activity, gravitational forces
Explanation:
Tectonic movements refers to movement occurring within the earth's crust.
The rotation of the earth on it's axis releases significant amounts of gravitational energy that results in deformation and movement of the earth's crust and mass redistribution of the tectonic plates.
Some of the main forces by which earth's rotation affects tectonic movements are:
Tidal friction due to the gravitational force of the Moon as well the Sun on the earth's crust; and change of the shape of the earth due to small displacements of the rotational pole with respect to the earth's crust.
Geothermal activity is caused by the transfer of heat from depth to the earth's surface. Convection currents in the mantle drive tectonic movements. Within the mantle of the earth, molten magma rises to the top while hot cold solid rock sinks to the bottom setting up a flow known as mantle convection. The rising and sinking motions of materials deform the outer surface of the earth producing earthquakes, mountain ranges, and volcanos on earth.
Two gravitational forces- slab pull and ridge push- cause tectonic movements. Slab pull occurs where gravity pulls
the edge of a cold, dense plate into the asthenosphere due to its weight dragging the entire rigid plate along.
Ridge push occurs when material from a mid-ocean ridge when cooled and thus becoming denser, slides down a raised but weaker asthenosphere due to gravity and push outwards on the lithosphere farther away from the ridges, allowing hot magma from the mantle to flow upwards again.
Answer:
Earth's rotation, geothermal activity, gravitational forces
Explanation:
i got it right on the test so hope this helps :)
Ferns often have small bumps called sori arranged in rows on their undersides. What are these structures?A) Spore capsules.
B) Seed capsules.C) Nodules containing symbiotic bacteria.D) Parasites.
Answer:
A) Spore capsules
Explanation:
Ferns produce spore capsules contained in the sporangium (plural: sporangia), a structure localized on the undersides of the leaves. Moreover, the sporangia are borne in clusters known as sori (singular sorus). The spores are single reproductive cells that, when mature, are released from the sporangium to germinate on soil and produce new ferns. In a fern sporangium, the maximum number of spores is 64, although this number depends on the species.