उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What is a heterotroph?

1. AAn organism with no cells
2. BAn organism that makes its own food by photosynthesis
3. CAn organism that gets its food from other organisms
4. DAn organism that lives only in water

What are restriction enzymes?

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

A solution has a pH of 3. How is it described?

1. AIsotonic
2. BBasic
3. CAcidic
4. DNeutral

A patient's heart rate is measured four times: 70, 72, 74 and 80 beats per minute. What is the mean?

1. A74 beats per minute
2. B73 beats per minute
3. C80 beats per minute
4. D72 beats per minute

What does the enzyme lipase break down?

1. AProteins into amino acids and peptides
2. BFats into fatty acids and glycerol
3. CDNA into nucleotides
4. DStarch into sugars

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA silent mutation
2. BA nonsense mutation
3. CA frameshift mutation
4. DA missense mutation

A patient with type A blood is given type B red blood cells by mistake. What is the cause of the reaction that follows?

1. AAnti-B antibodies in the patient's plasma attack the donor cells
2. BThe donor's B antigens destroy the patient's white blood cells
3. CAnti-A antibodies on the donor cells attack the patient's plasma
4. DThe patient's A antigens dissolve the donor's haemoglobin

A man with an X-linked recessive disorder (XʰY) has children with a woman who has two normal alleles (XᴴXᴴ). What is expected among their children?

1. AHalf of the sons and half of the daughters are affected
2. BAll daughters are affected, and all sons are carriers
3. CAll daughters are carriers, and no sons are affected
4. DAll sons are affected, and no daughters are carriers