All of the following activities occur in the course of prophase in mitosis except crossing over.
Mitosis may be divided into 4 stages: prophase, metaphase, anaphase, and telophase.
Throughout prophase, the chromatids condense into chromosomes, thereby making them seen. The mitotic spindle is a structure composed of microtubule proteins that segregate the chromosomes in mitosis. This shape is formed in prophase.
In Prophase homologous pairs of chromosomes are paired together. In metaphase, these chromosomes are lined up at the equator of the mobile, and sister chromatids are connected to the spindle fiber.
Crossing over (or recombination) is the alternate of genetic cloth between non-sister chromatids that occurs in the course of prophase I of meiosis.
In end, condensation of DNA, the pairing of chromosomes, and, spindle formation arise for the duration of prophase, while crossing over occurs in prophase I of the meiotic cellular department (choice B).
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Answer:
Estrogen binds to specific receptors inside many kinds of cells, each of which have different responses to its binding. intracellular receptors are present only in target cells
Ans. 25.
Messenger RNA or mRNA has genetic information in the form of triplet codes, called as codons. These codons are made up of three nucleotide bases and each codon codes for a specific amino acid during protein synthesis.
According to codon chart, GCU codes for alanine (Ala), AAU codes for asparagine (Asn), and GUC codes for valine (Val). Thus, the amino acid sequence for the mRNA strand GCU - AAU - GUC is Ala-Asn-Val.
Ans. 26.
a). There are a total of sixty-four codons, made up of combinations of four nucleotide bases (4 X 4 X 4= 64). Out of sixty four codons, sixty one codons code for twenty amino acids that make proteins, while three codons (UAG, UGA, UAA) do not code for any amino acid and act as stop codons. Thus, no protein will be form with the mRNA strand UAG-UGA-UAA.
b). The UAG, UGA, and UAA are stop codons that act as signals to terminate the translation during protein synthesis. Thus, if a ribosome reads the mRNA sequence UAG, UGA, and UAA during translation, it will lead to termination of protein synthesis.
"change over time" best describes evolution
Answer:
Elements: H (hydrogen) He (helium) Li (lithium) Be (beryllium) B (boron)
compounds: H2O (water) H2O2 (Hydrogen peroxide) NsHCO3 (baking soda) NaCI (salt)
Element compound or mixture?: 1. Element 2. compound 3. Mixture of elements 4. mixture of compounds 5. mixture of elements and compounds.
Rewrite the sentences:
1. all matter is made up of tiny particles calles atoms and molecules
2. right
3. right
4. compounds are chemically joined together
task 2:
1. i know this is element
2. i know this is compound
3. i know this is mixture
task 3:
In this lesson i have learned that Atoms are in everything and are what makes up most of the stuff on earth. They are tiny molecules that make up me and everything around me. I have also learned that atoms are made up of Elements. Elements are chemical molecules that make up things like the air we breathe. However, when more than one element joins together a compound is formed. Compounds make up more physical things around me such as drinking water and salt for cooking. When many different compounds are joined together a mixture is formed. An example of a mixture can be sand and water.
Explanation: