Answer:
B) When an electrically charged object comes close to an uncharged object, it will attract it.
Explanation:
Suppose that you rubbed a balloon with a sample of animal fur such as a wool sweater or even your own hair. The balloon would likely become charged and its charge would exert a strange influence upon other objects in its vicinity. If some small bits of paper were placed upon a table and the balloon were brought near and held above the paper bits, then the presence of the charged balloon might create a sufficient attraction for the paper bits to raise them off the table. This influence - known as an electric force - occurs even when the charged balloon is held some distance away from the paper bits. The electric force is a non-contact force. Any charged object can exert this force upon other objects - both charged and uncharged objects.
Any charged object - whether positively charged or negatively charged - will have an attractive interaction with a neutral object. Positively charged objects and neutral objects attract each other; and negatively charged objects and neutral objects attract each other.
Answer: E. Nowhere in the cells
Explanation:
The cell cycle is an ordered set of events leading to cell growth and division into two daughter cells. The stages are G1-S-G2 (which comprise the interface of the cycle) and M. During the interface, the cell grows and synthesizes components necessary for survival (during G1 and G2), and duplicates its DNA (during S). And during M (Mitosis), the division of the nucleus into two daughter nuclei, and division of the cytoplasm occurs (the latter in a process called cytokinesis).
So, mitosis is the actual cell division, producing two genetically identical daughter cells. Each cell is diploid and contains the same number of chromosomes, because the genetic material was previously duplicated during S stage in interphase.
The stages of mitosis consist of
:
- Prophase: The chromosomes move from the lax working form to the compact transport form. The nuclear envelope is fractionated into a series of tanks that are no longer distinguishable from the ER. The nucleoli also disappear, dispersing in the cytoplasm in the form of ribosomes.
- Metaphase: The mitotic or achromatic spindle appears, formed by beams of microtubules; the chromosomes join some microtubules through a lamellar protein structure located on each side of the centromere, called cinetochorus.
- Anaphase: The offspring centromeres are separated from the chromatids, which now become offspring chromosomes. Each set of daughter chromosomes migrates to one pole of the cell. The mitotic spindle is the structure that carries out the distribution of the offspring chromosomes in the two offspring nuclei. The movement is carried out thanks to the activity of the chromosomal microtubules, which are shortened at the end attached to the cinetochorus. The polar microtubules slide in the opposite direction, distancing the two groups of child chromosomes.
- Telophase: Begins when the chromosomes reach the poles of the cell. The offspring chromosomes lengthen, lose condensation, the nuclear envelope is formed again from the rough RE.
Cytosine is one of the five nitrogenous bases that make up the nucleic acids (DNA and RNA) and is represented in the genetic code by the letter C. The other four bases are adenine, guanine, thymine and uracil.
If the labeled cytosine is added during the prophase of mitosis, <u>the DNA has already been duplicated during the S-stage and will no longer incorporate this labeled base into the molecule.</u> So is not going to be found in either the mother cell or the daughter cells.
I would say false because fossil fuels are formed by dead animal matter
different laws actually help protect the land
Answer:
Enzymes can be defined as biological polymers that catalyze biochemical reactions.”
Majority of enzymes are proteins with catalytic capabilities crucial to perform different processes. Metabolic processes and other chemical reactions in the cell are carried out by a set of enzymes that are necessary to sustain life.
The initial stage of metabolic process depends upon the enzymes, which react with a molecule and is called the substrate. Enzymes convert the substrates into other distinct molecules and are called the products.
The regulation of enzymes has been a key element in clinical diagnosis because of their role in maintaining life processes. The macromolecular components of all enzymes consist of protein, except in the class of RNA catalysts called ribozymes. The word ribozyme is derived from the ribonucleic acid enzyme. Many ribozymes are molecules of ribonucleic acid, which catalyze reactions in one of their own bonds or among other RNAs.
Enzymes are found in all tissues and fluids of the body. Catalysis of all reactions taking place in metabolic pathways are carried out by intracellular enzymes. The enzymes in plasma membrane govern the catalysis in the cells as a response to cellular signals and enzymes in the circulatory system regulate clotting of blood. Most of the critical life processes are established on the functions of enzymes.
Enzyme Structure
Enzymes are a linear chain of amino acids, which give rise to a three-dimensional structure. The sequence of amino acids specifies the structure, which in turn identifies the catalytic activity of the enzyme. Upon heating, enzyme’s structure denatures, resulting in a loss of enzyme activity, that typically is associated with temperature.
Compared to its substrates, enzymes are typically large with varying sizes, ranging from 62 amino acid residues to an average of 2500 residues found in fatty acid synthase. Only a small section of the structure is involved in catalysis and is situated next to the binding sites. The catalytic site and binding site together constitute the enzyme’s active site. A small number of ribozymes exist which serve as an RNA-based biological catalyst. It reacts in complex with proteins.
Explanation:
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