ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

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

1. AAcidic
2. BIsotonic
3. CBasic
4. DNeutral

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. AAmylase
2. BLigase
3. CHelicase
4. DLipase

What does the polymerase chain reaction (PCR) do?

1. AIt turns RNA into protein
2. BIt makes many copies of a piece of DNA
3. CIt cuts DNA at specific sequences
4. DIt separates proteins by their charge

Nerve cells release chemical messengers (neurotransmitters) stored in vesicles. By which process are they released?

1. AExocytosis
2. BEndocytosis
3. COsmosis
4. DPhagocytosis

يقرأ خيط DNA القالب T-A-C. ما كودون mRNA المقابل؟

1. AT-A-C
2. BA-T-G
3. CU-T-G
4. DA-U-G

What is the role of cholesterol in animal cell membranes?

1. AIt stores the cell's genetic information
2. BIt carries glucose molecules across the membrane into the cell
3. CIt forms a rigid wall around the cell
4. DIt keeps membrane fluidity stable as temperature changes

Sweating cools the body. Which property of water best explains this?

1. AIt is a nonpolar solvent
2. BIt takes a lot of heat energy to evaporate
3. CIt has a very low specific heat
4. DIt is less dense as ice than as a liquid

A karyotype shows 45 chromosomes, with a single X chromosome and no Y. Which condition is this?

1. AKlinefelter syndrome
2. BA typical male karyotype
3. CDown syndrome
4. DTurner syndrome