ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What does phloem carry in a plant?

1. AChlorophyll to the stem
2. BWater from the roots only
3. CSugars made in the leaves
4. DCarbon dioxide from the air

Which protein carries oxygen in red blood cells?

1. AHaemoglobin
2. BKeratin
3. CInsulin
4. DCollagen

What is an allele?

1. AA pair of matching chromosomes from each parent
2. BA protein made from a gene
3. CA different version of the same gene
4. DA section of DNA between genes

كيف تتكاثر البكتيريا عادةً؟

1. Aبالانقسام الاختزالي
2. Bبإطلاق فيروسات بالتبرعم
3. Cبتكوين البذور
4. Dبالانشطار الثنائي

What is meant by independent assortment in meiosis?

1. AHomologous pairs line up randomly, so gametes get different mixes of chromosomes
2. BAll chromosomes from the mother go into the same gamete
3. CDNA is copied separately in each chromosome
4. DSister chromatids stay joined until the end of meiosis, so all gametes are identical

A person catches chickenpox once and does not usually become ill with it again. Why?

1. AMemory cells give a faster, stronger response the next time
2. BAntibodies from the first infection turn into new viruses
3. CThe skin becomes thicker after the first infection
4. DThe virus stays in the blood and kills new viruses

Why are mutations in mitochondrial DNA passed on only from mothers to their children?

1. AThe zygote's mitochondria come from the egg
2. BOnly women have mitochondria in their cells
3. CSperm cells contain no DNA at all
4. DMitochondrial DNA is on the X chromosome

Home pregnancy tests use antibodies that bind the hormone hCG. Why do they react with hCG and not with other proteins in urine?

1. AEach antibody binds a specific antigen shape
2. BUrine contains no other proteins at all
3. CAntibodies bind every protein but change colour only with hCG
4. DThe hormone hCG is a type of antibody itself