16. Which statement about plasmids is false? A) B) They are small circular chromosomes containing a small number of genes. They are small segments of genes that replicate independently of the main chromosome of the cell They are small pieces of They have the same function as the mitochondria in eukaryotic cells. They are moveable pieces of DNA found in bacteria. DNA that transfer genes between bacteria. C) D) E) 17. Which organelle does not contain DNA? A) Nucleus B) Chloroplast C) Mitochondria D) Ribosome E) All of the above contain DNA. 18. Refer to the figure below Generation I (parents) Female Goneration Oidest Youngest This is a pedigree for a family in which several individuals develop a neurodegenerative disease late in life. If individual A has children with an unaffected woman, what is the probability that their first child will be affected? A) 0 percent B) 25 percent C) 33 percent D) 50 percent E) 100 percent
16. Which statement about plasmids is false? A) B) They are small circular chromosomes containing a small number of genes. They are small segments of genes that replicate independently of the main chromosome of the cell They are small pieces of They have the same function as the mitochondria in eukaryotic cells. They are moveable pieces of DNA found in bacteria. DNA that transfer genes between bacteria. C) D) E) 17. Which organelle does not contain DNA? A) Nucleus B) Chloroplast C) Mitochondria D) Ribosome E) All of the above contain DNA. 18. Refer to the figure below Generation I (parents) Female Goneration Oidest Youngest This is a pedigree for a family in which several individuals develop a neurodegenerative disease late in life. If individual A has children with an unaffected woman, what is the probability that their first child will be affected? A) 0 percent B) 25 percent C) 33 percent D) 50 percent E) 100 percent
Answer
Question 16-
Plasmid are the extra circular chromosome found in the cytoplasm
of bacteria having small number of genes. These plasmid are
transferred from donor to recipient bacteria by means of
conjugation. Such plasmid have the ability to replicate
irrespective of main genome. These are the movable piece of DNA
found in bacteria.
But these plasmid has no gene for ATP synthesis. This function
is maintained by the mesosome found in the plasma membrane of
bacteria.
That's why false statement is D. (Right option)
Question 17-
Chloroplast, mitochondria, nucleus contains DNA.
But ribosome does not contain DNA.
That's why right option is D.
Question18-
A individual genotype is Aa
And mother genotype is aa
Parents: Father (Aa) × Mother(aa)
Punnet square:
| Gametes |
a |
a |
| A |
Aa(affected) |
Aa(affected) |
| a |
aa(normal) |
aa(normal) |
The affected child percentage is 2/4×100=50%
That's why right option is D.
