Answer:
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive
Explanation:
BIOLOGY PLS HELP!!! A 5% salt cell is placed in a 15% salt solution. What type of solution is this cell in?
a) hypotonic
b) hypertonic
c) isotonic
Answer:b
Explanation: the solution is more concentrated (hyper) than the cell is
hyper means more than and hypo means less than like hyperthermia (too hot) or hypothermia (too cold)
Vertebrates have a notochord, dorsal nerve cord, and gill slits at some point during
embryonic development.
True
False
Answer:
True.
Explanation:
Animals in the phylum Chordata share five key characteristics that appear at some stage during their development: a notochord, a dorsal hollownerve cord, pharyngeal gill arches or slits.
(b)
The image below shows part of the surface of a leaf.
0.1 mm x 0.1 mm
The length and width of this piece of leaf surface are both 0.1 mm
Calculate the number of stomata per mm of this leaf surface.
Explanation:
You didn't attach a picture so i'll just explain how to find the number of stomatas/mm^2.
first you find the surface by multiplying the length by the width
0.1*0.1=0.01mm^2
now you count the numer of stomatas in the picture
in0.01mm^2 you have.........................x stomatas
in 1mm you have ...............................y stomatas
y=100x
Cytoplasm
Ribosomes
Nucleoid
Plasma membrane
(Peptidoglycan
Cell wall
Outer membrane
Capsule
a
Prokaryote
B
Eukaryote
A botanist crosses two pink-flowered plants. The cross involves alleles that were not clearly dominant or recessive and could make red, pink, and white-flowered plants. If four plants are produced from the cross, what is the expected number of white-flowered plants?
Answer:
1
Explanation:
According to the information in this question, a gene coding for flower color in a plant is involved. The allele for red color (R) is incompletely dominant over the allele for white color (r) to form an intermediate phenotype/color i.e. Pink that is heterozygous (Rr) for the gene.
If two pink plants are crossed i.e. Rr × Rr, each parent will produce R and r gametes. Using these gametes in a punnet square (see attached image), the following offsprings will result: RR, Rr, Rr, and rr.
Out of these four offsprings;
1 RR is red : 2 Rr is pink: 1 rr is white
Hence, If four plants are produced from this cross, according to this question, the expected number of white-flowered plants will be 1 out of 4.
Can someone please help me??
Which type of reproduction is responsible for genetic variation?
Answer:
sexual reproduction
Explanation:
Sexual reproduction results in infinite possibilities of genetic variation. In other words, sexual reproduction results in offspring that are genetically unique. They differ from both parents and also from each other.
Other reproductions like asexual, budding or fragmentation don't produce genetic variation.
The type of reproduction is responsible for genetic variation is - sexual reproduction.
Sexual reproduction is combining genetic information from two individuals, by the fusion of gametes such as sperm and egg, called fertilization which generates more genetic variation, by the process like the combination of alleles and crossing over.
Parents and offsprings are not identical in this reproduction type, however, they are genetically similar.Fusion or combination of two different parent's gametes.There is recombination take place which causes genetic variations as well.Thus, the correct answer that is responsible for genetic variation is - sexual reproduction.
Learn more about sexual reproduction:
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Which statement is an example of how structure relates to function?
An allele for purple flowers is dominant and an allele for white flowers is recessive
Mitochondria have a highly folded membrane which increases the amount of ATP that can be made.
DNA transcribes into RNA, and RNA translates into proteins.
Heredity is the passing of genetic information from parent to offspring.
Answer:
Mitochondria have a highly folded membrane which increases the amount of ATP that can be made.
To move the objective lens up and down, I would turn the _________ __________ dial. Which two words complete the sentence? ps: i gave 100 points so answer
Answer:
knob and the dial are the words
Which organelle, found only in plant cells, has the function of storing starch?
Answer:
Explanation:
Plant Plastids are the only organelle Plant cells have that store starch
SOMEONE PLEASE HELP ME WITH THIS I REALLY WANT TO PASS!!!!!!!!!!
Help plzzzzzzzzzzzzzzz
Answer:
B) they make the spindle fibers
Explanation:
4. Which of the following would be the best control sample for the study?
A)
A sample of water collected just downstream of the southern forest
(B) A sample of water collected just downstream of the housing development
C)A sample of water collected just downstream of the northern forest
D)A sample of distilled water
Answer:
D. A sample of distilled water
Explanation:
You need to have a control sample that hasn't been messed with to see what would happen if you had no reaction to your experiment
A sample is the smaller set of data which a researcher makes use of to complete a research.
As a result of this, we can see that a sample study is the use of these samples to come to a conclusion about the investigation or research which is going on.
Some examples of a sample study include:
Simple random sampling. Systematic sampling. Stratified sampling, etcPlease note that your question is incomplete so i gave you a general overview which would help you get a better understanding of the topic.
Read more here:
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4. Describe your results.
I
A runner has started a 3-mile race. She wants to run the mile in 24 minutes. When she gets to the 2.2-mile mark she begins to get greatly fatigued and her muscles start burning. What is happening in her body that causes this?
A)There is a virus in her that is infecting her muscle cells.
B)She has started to run out of ATP energy so the muscles are trying to make some creating lactic acid that causes the burn.
C)She did not stretch properly so the muscles are tightening up and burning because of it.
D)She should have had more water before the race so that she was well hydrated.
Answer:
b i think
Explanation:
please please help me with this one
Infer If the rock layers shown above hare
not been disturbed, what type of dating
method would help you determine which
layer is oldest? Explain.
Answer:
radiometric dating methods
Explanation:
The oldest rock layer will be at the very bottom, and as time goes on, more layers will form making the top layer the youngest layer and the bottom layer the oldest. This method can determine the amount of radioactive decay of certain elements which can help them make a geologic time scale.
What was the foundation of Georges Lemaître’s Big Bang Theory?
Answer:
Georges Lemaître, Belgian astronomer and cosmologist who formulated the modern big-bang theory, which holds that the universe began in a cataclysmic explosion of a small, primeval “super-atom.” A civil engineer, Lemaître served as an artillery officer in the Belgian Army during World War I. After
Explanation:
hope it helps!
Mitosis goes through two divisions to create diploid cells. true or false
Answer:
false
Explanation:
mitosis goes through one division cycle
Answer:True.
Explanation:
The diagram models the collision of India with the Eurasian plate. Way crustal feature began forming 10 million years ago when India collided with the Eurasian plates?
Answer:a mountain range
Explanation: because when when they crashed it created a mountain range
Answer:
B
when they crashed it created a mountain range
Identify the different types of energy below
Answer:
B
Explanation:
Fan is a conduction method of energy
The heat from the coffee conventions through to the spoon and the cup and the sun is radiation heat
Figure 1 shows a seaside cliff. Figure 2 shows the same cliff after a period of time has passed. What caused the change from figure 1 to figure 2? A. rainfall only B. ocean waves only C. wind D. rainfall and ocean waves
Answer:
I think its A. because i have this test and its not B
i hope this is helping you!!!!!
Explanation:
if the egg of a particular butterfly has 14 chromosomes, how many chromosomes will be found in a somatic cell for this butterfly - PLEASE HELP DUE TONIGHT
Answer:
not
Explanation:
If the egg of a particular butterfly has 14 chromosome, then the somatic cells will have same 14 chromosomes.
What are somatic cells?A somatic cell, also known as a vegetal cell, is any biological cell other than a gamete, germ cell, gametocyte, or undifferentiated stem cell that forms the body of a multicellular organism.
These cells make up the body of an organism and divide via binary fission and mitotic division.
Mitosis is a cell division process that produces somatic cells. They have two copies of each chromosome, one from the mother and one from the father. Diploid cells usually have two copies each of each chromosome.
Mitosis is the method by which one cell splits into two genetically identical daughter cells.
The cell's chromosomes are copied and then distributed evenly between the two new nuclei of the daughter cells during the various stages of mitosis.
Thus, as these are somatic cells, they will have same number of chromosomes.
For more details regarding somatic cells, visit:
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The cell was first discovered by who?and in what year
Answer:
Robert Hooke and 1665
Explanation:
The cell was first discovered by who?and in what year.
Answer:Robert HookeYear of 1665
The cell has a rich and interesting history that has ultimately given way to many of today's scientific advancements.#CARRYONLEARNING #STUDYWELLWhat type of cell division is occurring in the
diagram to the left?
A. Mitosis I and Mitosis Il
B. Meiosis I and Meiosis Il
C. Synthesis
D. Mitosis I and Meiosis Il
Where are most mountains on Earth fomed?
Answer:
asia
Explanation:
Answer:
Mountains are most often formed by movement of the tectonic plates in the Earth's crust. Great mountain ranges like the Himalayas often form along the boundaries of these plates. Tectonic plates move very slowly.
Explanation:
link between the struction and function of water molecule
5. Why do thorns and spines exist? *
O To stop animals from eating plants
To stop insects from pollinating
To stop people from looking at plants
O To help plants stay standing upright and give them their shape
Answer:
to stop animals from eating plants
Explanation:
the thorns and spines help protect the plant for example if we touch the plant it hurts same goes with animals
Answer:
A. To stop animals from eating plants
two difference between drone bee and worker bee
Answer:
The worker bees are female, but they do not breed. The queen bee is female and creates all the babies for the hive. The drone bees are male and do not have a sting. Bees communicate with each other about food sources using dances.
Explanation:
Can someone please help me meee
Answer:
A. fallopian tube
B. ovary
C. cervix
D. endometrium
hope this helps!! :)
Explanation:
Answer:
A. fallopian tube B. ovary C. cervix D. endometrium
Which describes chemical digestion? *