ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What are restriction enzymes?

1. AEnzymes that cut DNA at specific base sequences
2. BEnzymes that digest fats in the intestine
3. CEnzymes that copy RNA into DNA
4. DEnzymes that join amino acids into proteins

Which bonds hold the two strands of a DNA double helix together?

1. ADisulfide bonds between the bases
2. BIonic bonds between the phosphates
3. CPeptide bonds between the sugars
4. DHydrogen bonds between the bases

Which of these diseases is caused by a virus?

1. AAthlete's foot
2. BTuberculosis
3. CInfluenza
4. DMalaria

أي رابطة تربط الأحماض الأمينية معًا في البروتين؟

1. Aالرابطة الببتيدية
2. Bالرابطة الإسترية
3. Cالرابطة الغليكوسيدية
4. Dالرابطة الهيدروجينية بين القواعد

What is the function of the pores in the nuclear envelope?

1. AThey make ribosomal RNA for the cell
2. BThey let chromosomes leave the nucleus to be copied
3. CThey attach the nucleus to the cell membrane
4. DThey let molecules such as mRNA pass in and out

A deletion removes exactly three bases, forming one whole codon, from the middle of a gene. What is the most likely result?

1. ANo protein can be made at all
2. BThe protein lacks one amino acid but the rest is unchanged
3. CThe protein becomes three times longer
4. DEvery amino acid after the deletion is changed to a new one

A new infectious agent passes through filters that trap bacteria, does not grow on nutrient agar and multiplies only inside living cells. What is it most likely to be?

1. AA fungus
2. BA bacterium
3. CA virus
4. DA protozoan

During the Industrial Revolution, soot darkened tree trunks in parts of England, and dark peppered moths became more common than pale ones. What best explains this?

1. ADark moths were produced by the polluted air
2. BBirds found and ate fewer dark moths on the dark trunks
3. CThe moths chose to become dark to hide
4. DThe soot settled on the pale moths and slowly turned them dark