उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए जीव विज्ञान वर्कशीट

What does homozygous mean?

1. AHaving an extra chromosome
2. BHaving two different alleles for a gene
3. CHaving two identical alleles for a gene
4. DHaving only one copy of a gene

In biology, what is a clone?

1. AAn organism that carries genes from two different species
2. BA genetically identical copy of an organism, cell or gene
3. CAn offspring of two different parents
4. DA cell with an extra chromosome

What is a bacteriophage?

1. AA fungus that kills bacteria
2. BA virus that infects bacteria
3. CA bacterium that infects viruses
4. DA white cell that eats bacteria

Which kind of mutation can be passed on to a person's children?

1. AA mutation in a cell that forms eggs or sperm
2. BA mutation in a white blood cell during infection
3. CA mutation in a skin cell caused by sunlight
4. DA mutation in a liver cell caused by alcohol

Why do many plants close their stomata on hot, dry days?

1. ATo reduce water loss
2. BTo take in more carbon dioxide
3. CTo speed up photosynthesis
4. DTo release more oxygen

A student's hypothesis is "Salt water slows the growth of bean seedlings." Which is a prediction based on it?

1. ASeedlings given salt water will grow less than those given plain water
2. BSalt water is made of sodium chloride and water
3. CBean seedlings need sunlight and water to grow well
4. DSeedlings given plain water will die within a week

मटर के दो पौधे, दोनों AaBb, का संकरण कराया जाता है। जीन अलग-अलग गुणसूत्रों पर हैं। संतानों का कौन-सा अंश दोनों अप्रभावी लक्षण (aabb) दिखाएगा?

1. A3/16
2. B9/16
3. C1/16
4. D1/4

Bacteria grown in heavy nitrogen (¹⁵N) are moved to normal nitrogen (¹⁴N) and allowed to divide once. All their DNA now has a density halfway between heavy and light. Which model of replication does this support?

1. AReplication without a template
2. BSemiconservative replication
3. CConservative replication
4. DReplication by RNA copying