उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What is homeostasis?

1. AMaking identical copies of a cell
2. BKeeping a stable internal environment
3. CBreaking down food for energy
4. DChanging a species over many generations

What does gel electrophoresis separate?

1. ADNA fragments by size
2. BBlood into plasma and cells
3. CChromosomes by their colour
4. DCells by their shape

What are restriction enzymes?

1. AEnzymes that cut DNA at specific base sequences
2. BEnzymes that join amino acids into proteins
3. CEnzymes that digest fats in the intestine
4. DEnzymes that copy RNA into DNA

There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?

1. AOnly 20 of the codons are ever used
2. BMost amino acids are coded for by more than one codon
3. CEach amino acid has exactly three codons
4. DEach codon codes for more than one amino acid at the same time

What does it mean that a person's blood is Rh negative?

1. ATheir plasma has no antibodies at all
2. BTheir red cells carry extra RhD antigen
3. CTheir red cells lack the RhD antigen
4. DTheir red cells lack the A and B antigens

The results of an experiment do not support the hypothesis. What should the scientist do next?

1. AStop doing any further research on the question
2. BChange the data so they fit the hypothesis
3. CReport that the hypothesis was proven correct
4. DRevise the hypothesis and test it again

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A0.5 mm
2. B0.2 mm
3. C8 mm
4. D2 mm

A man has Klinefelter syndrome (XXY). Which error most likely produced it?

1. ACrossing over between chromosome 21 and the X chromosome
2. BA frameshift mutation in one of the genes on the father's Y chromosome
3. CExtra mitosis in the zygote after fertilisation
4. DNondisjunction of the sex chromosomes during meiosis in a parent