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Reproduction and Development
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Living Environment Regents June 2008 Question 03 |
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Thursday, 23 April 2009 05:10 |
Genetic material remains same, but developing cells express different parts depending on their origin from different germinal layers like ectoderm, mesoderm & endoderm.
Correct Answer: Option 1
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Living Environment Regents June 2008 Question 07 |
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Thursday, 23 April 2009 05:32 |
Asexual reproduction is reproduction which does not involve meiosis (reduction division in which the number of chromosomes per cell is halved) and/or fertilization (fusion of gametes to produce a new organism). Certain types of starfish reproduce asexually by means of fragmentation (breaking of their body into fragments), followed by regeneration (the re-growing of lost body parts).
nucleotide bases are the parts of DNA and RNA that may be involved in pairing. The main ones are cytosine, guanine, adenine (DNA and RNA), thymine (DNA) and uracil (RNA), abbreviated as C, G, A, T, and U, respectively. They are usually simply called bases in genetics, that are used to carry heredity information.
Correct Answer: Option 1
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Last Updated on Thursday, 23 April 2009 05:34 |
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Living Environment Regents June 2008 Question 11 |
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Thursday, 23 April 2009 05:51 |
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DNA replication is a fundamental process for basis for biological inheritance.
Correct Answer: Option 3
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Living Environment Regents June 2008 Question 16 |
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Thursday, 23 April 2009 06:11 |
Mitotic Cell Division: Is a process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical sets in two daughter nuclei. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic phase of the cell cycle - the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.
Active Transport: It is a process of moving particles across a biological membrane against a concentration gradient. If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport.
Genetic Recombination: It is the process by which a strand of genetic material (DNA/RNA) is broken and then joined to a different DNA molecule
Protein Synthesis: Protein synthesis is the creation of proteins using DNA and RNA
Correct Answer: Option 3
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Last Updated on Thursday, 23 April 2009 06:20 |
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Living Environment Regents June 2008 Question 17 |
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Thursday, 23 April 2009 06:16 |
Meiotic division is present in gametes namely spermatozoa and ovum
Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. Meiosis involves a reduction in the amount of genetic material.Meiosis comprises two successive nuclear divisions with only one round of DNA replication
Correct Answer: Option 2
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Living Environment Regents June 2008 Question 18 |
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Thursday, 23 April 2009 06:20 |
The placenta or afterbirth is a highly vascularized ephemeral organ present in eutherian mammals that connects the developing fetal tissues to the uterine wall. The placenta supplies the fetus with maternal nutrients, and allows fetal waste to be disposed of via the maternal kidneys
Correct Answer: Option 1
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Living Environment Regents June 2008 Question 22 |
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Thursday, 23 April 2009 06:29 |
Differentiation & growth
An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination. In humans, it is called an embryo from the moment of implantation until the end of the 8th week, where after it is instead called a fetus. The Embryo grows by mitosis which represents division of the cells for growth.
Mitosis is the process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical sets in two daughter nuclei.[1] It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle - the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.
Hence the other 3 options do not hold good for the development of Embryo.
Correct Answer: Option 2
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Living Environment Regents June 2008 Question 37 |
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Thursday, 23 April 2009 07:13 |
Correct Answer: Option 4
There is no information in the graph about the formation of new species.
Also, there is no information about the speed of reproduction of bacteria.
The data is represented from 00 to 1000. This does not refer that the bacteria can only survive in the temperatures ranging between 00 to 1000
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Last Updated on Thursday, 23 April 2009 07:17 |
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