The answer to this question is B, nucleus.
The control center of a cell is the nucleus. It oversees all the cell's functions because it contains the cell's DNA. Other cell components, like the mitochondrion, lysosome, or cytoplasm, have different roles.
The control center of a cell is the nucleus. The nucleus oversees all the functions of the cell, essentially acting like its brain. This is because it contains the cell's DNA, the instructions for every task the cell needs to perform. Other components of the cell, like the mitochondrion, lysosome, or cytoplasm, have different functions. For example, the mitochondrion is responsible for energy production, the lysosome for waste disposal, and the cytoplasm acts as a medium for cellular processes.
#SPJ6
the correct answer is radioactive isotopes
B. insect evolution
C. artificial intelligence
D. forest soil
2.How does radioactive dating contribute to earth science?
A. helps determine how old a tree is
B. helps date the earth more precisely
C. helps determine the composition of rocks
thymine
cytosine
The RNA gets its information from DNA to synthesise the proteins. It is different from DNA also due to the difference in one nitrogen basis as uracil. The thymine, the nitrogen basis that is only present in DNA is replaced with uracil to form RNA coding. The uracil also contains the same features as thymine has in DNA strains. Uracil makes a double H-bond with the adenine but does not contain CH4 group which is present in thymine.
The aerodynamic shape and lightness of the blue shark body allow itto move “elegantly” across the oceans. It exhibits countershading likemany other sharks. The upper part is an indigo blue tone while theventral and the sides are white.
It has a long caudal heterocercal fin. The second dorsal fin measuresalmost half the size of the first and its pectoral fins are unusuallylong compared to other sharks. Its eyes are large, its teeth aretriangular, and it has a conical snout.
It reaches a length ranging from 3.8 to 4 meters and weighs about 240kilograms. This species presents slight sexual dimorphism since thefemale tends to measure little more than 1 meter in comparison with themale.
Out of the following given choices;
A. The cell is unable to get more water into the cell.
B. The cell is unable to build more protein molecules.
C. The cell is unable to produce water molecules inside the cell.
D. The cell is unable to maintain a stable internal environment.
The answer is D. Due to high amounts of proteins in the cell, osmoticallyactive proteins cause the internal environment of the cell to be hypertonic tothe extracellular fluid. This causes excess water to enter the cell by osmosis andresulting in lysis.
Ans.
The dominant allele can be defined as the allele, which can express itself in both heterozygous and homozygous conditions. On the other hand, recessive allele can only express itself in homozygous condition (when both the alleles for recessive traits are present. It means presence of one dominant allele can hide the expression of recessive allele.
In given experimental flower, red color is dominant over white color of flower. So, 'if a plant grower wants to produce red flowers only, he should choose both the parent plants having red flowers as they have at least one allele for red color that would transfer to their offspring.'
Lets understand this in a calculative way,
Let the parents genotype be RR and Rr
The offspring’s produced are – RR, Rr, Rr, RR, Thus all the offsprings are white as r is recessive, for producing a red flower the offspring must have “rr” genotype.
Now if parents have Rr and rr genotype , then the offspring would have Rr, rr, rr, Rr giving two white and two red flower. Of the second case may be where both the parent white flower are the carrier with genotype “Rr”
Thus in order to produce red flower the parents with following genotypes is necessary –
a) Both parents having Rr
b) One parents with rr and the other parent with Rr genotype