ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What is the main role of carbohydrates in the human diet?

1. ATo provide a quick source of energy
2. BTo carry the body's genetic information
3. CTo form antibodies
4. DTo build muscle tissue

Which of these hormones is a steroid?

1. AGlucagon
2. BGrowth hormone
3. CInsulin
4. DTestosterone

وفقًا للنظرية الخلوية، من أين تأتي الخلايا الجديدة؟

1. Aمن خلايا موجودة مسبقًا
2. Bمن فيروسات تدخل الجسم
3. Cمن المعادن في الغذاء
4. Dمن مادة غير حية في الجسم

A thermometer gives readings of 36,1, 36,1 and 36,2 °C for a water bath that is really at 37,0 °C. How are these readings best described?

1. APrecise but not accurate
2. BNeither accurate nor precise
3. CAccurate but not precise
4. DBoth accurate and precise

Why is water good at dissolving salts and sugars?

1. AIt contains carbon atoms
2. BIt has a very low boiling point
3. CIts molecules are nonpolar
4. DIts molecules are polar

In gel electrophoresis, why does DNA move towards the positive electrode?

1. ADNA has no charge and moves at random
2. BDNA has a positive charge from the nitrogen bases it contains
3. CDNA is pulled by gravity through the gel
4. DDNA has a negative charge from its phosphate groups

How does the CRISPR-Cas9 gene-editing system find the right place to cut DNA?

1. AThe Cas9 protein cuts DNA at random sites
2. BIt binds only to the start codon of every gene
3. CA guide RNA pairs with the matching DNA sequence
4. DIt reads the amino acid sequence of the protein

Some viruses are surrounded by a lipid envelope taken from the host cell's membrane. Why are these viruses usually inactivated easily by soap and alcohol?

1. ASoap and alcohol dissolve the viral DNA directly
2. BEnveloped viruses have no proteins at all
3. CThe envelope is made of chitin, which soap digests
4. DSoap and alcohol break up the lipid envelope