1-Kinase cascade proteins need to act sequentially in order to be effective. How
ID: 8954 • Letter: 1
Question
1-Kinase cascade proteins need to act sequentially in order to be effective. How does the cell help to ensure that these reactions take place in the correct order, despite occurring in a large volume of reaction space in the cytoplasm? What are the advantage(s) and disadvantage to this method of reaction organization
2) How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8 (2n=8)?
a. 2
b. 4
c. 8
d. 16
e. 32
3) If two chromosomes are homologous, they
a. Look similar under the microscope.
b. Have very similar DNA sequences.
c. Carry the same types of genes.
d. May carry different versions of the same gene.
e. Are all of the above.
Explanation / Answer
Hello, For questions 2 I found info stating that 16 combination's of chromosomes can be packaged made gametes with a diploid number of 8. So I would say the answer is D. For question 3 I found info stating that Homologous chromosomes are chromosomes with identical gene sequences. In organisms that reproduce sexually, like humans, each parent provides one half of the 46 chromosomes, which corresponds exactly with its matching pair. These chromosomes pair during meiosis, which needs to occur for the formation of gametes, or reproductive cells. For further clarification, the following are explanations of the above terms: Meiosis This is the two part process of cell division, in organisms that sexually reproduce, at the end of which four 'daughter' cells are produced from each 'parent' cell. Meiosis is divided into two stages, meiosis I and meiosis II, each of which contains a prophase, metaphase, anaphase and a telophase. Chromosome Each biological cell contains a nucleus in which an organized structure of DNA and protein, combine to form a chromosome. Chromosomes are the structures that contain genes. Genes These are units of heredity that give rise to certain characteristics in offspring. They are sections of DNA carried on the chromosome and control specifications like height, hair type and eye color. Genes can be of many types, two of which, dominant and recessive genes are explained below. Based off of this info I would go with D. Read through it and see if you get the same conclusion.
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