उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What is a eukaryote?

1. AA virus that infects animal cells
2. BAn organism whose cells have a nucleus
3. CAn organism that lives only in extreme heat
4. DAn organism made of a single cell without a nucleus

What is an organism's genotype?

1. AThe number of cells in its body
2. BThe alleles it carries for a trait
3. CThe traits that can be seen or measured
4. DThe environment in which it lives

How does a vaccine protect a person?

1. AIt kills all bacteria in the body straight away
2. BIt trains the immune system with a harmless form of a pathogen
3. CIt replaces the person's white blood cells with stronger ones
4. DIt blocks the pathogen from entering the nose

The genetic code is described as nearly universal. What does this mean?

1. AEvery cell in the body makes the same proteins
2. BAll organisms have the same number of chromosomes in their cells
3. CAll organisms have exactly the same genes
4. DThe same codons mean the same amino acids in nearly all organisms

What is the difference between an epidemic and a pandemic?

1. AA pandemic affects only one town
2. BA pandemic spreads across many countries or continents
3. CAn epidemic is caused only by bacteria
4. DAn epidemic affects the whole world at once

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

1. A80 beats per minute
2. B72 beats per minute
3. C74 beats per minute
4. D73 beats per minute

Griffith injected mice with heat-killed harmful bacteria mixed with live harmless bacteria. The mice died, and live harmful bacteria were found in them. What did this show?

1. AA substance from the dead bacteria changed the harmless ones
2. BThe mice were killed by the dead bacteria alone
3. CHeat makes harmless bacteria become harmful when they are injected
4. DBacteria can be killed by the immune system of mice

People who carry one sickle cell allele are more resistant to malaria. Why is the allele common in regions where malaria is widespread?

1. APeople with two sickle alleles are fully healthy there
2. BThe allele is dominant, so it spreads by itself
3. CNatural selection favours the heterozygotes there
4. DMalaria causes the sickle cell mutation directly