ใบงาน ชีววิทยาสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

เหตุใดไวรัสจึงสืบพันธุ์ด้วยตัวเองไม่ได้

1. Aต้องอาศัยกลไกของเซลล์เจ้าบ้านในการสร้างสำเนา
2. Bไม่มีสารพันธุกรรมใด ๆ เลย ทั้งดีเอ็นเอและอาร์เอ็นเอ
3. Cแบ่งตัวด้วยไมโอซิสเท่านั้น
4. Dสืบพันธุ์ได้เฉพาะในแสงแดด

Which characteristic is shared by all living things?

1. AThey have a backbone and a brain
2. BThey are made of many cells
3. CThey respond to changes in their environment
4. DThey make their own food by photosynthesis

What do bacteria use flagella for?

1. AMaking proteins from amino acids
2. BMoving from place to place
3. CCopying their DNA
4. DStoring food

What is the role of ribosomal RNA (rRNA)?

1. AIt brings single amino acids to the ribosome
2. BIt forms part of the ribosome and helps join amino acids
3. CIt stores genetic information in the nucleus
4. DIt carries the code from DNA to the ribosome

Why is the ABO blood group system an example of multiple alleles?

1. ABlood type is controlled by many separate genes
2. BEach person carries three different alleles of the ABO gene
3. CThere are three alleles of the gene in the population
4. DThe gene is found on several chromosomes

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy conjugation, transferring plasmids through a pilus
2. BBy mitosis, sharing copies of their chromosomes with neighbours
3. CBy meiosis, forming gametes with new alleles
4. DBy osmosis, moving genes in water

A breastfed baby receives antibodies from its mother's milk. Why does this protection last only a short time?

1. AThe baby's stomach makes the antibodies more active
2. BThe antibodies turn into memory cells after a few weeks
3. CThe antibodies from breast milk attack the baby's own red blood cells
4. DThe baby did not make these antibodies and forms no memory cells

After wolves are removed from a park, the deer population rises sharply and young trees are overgrazed. What does this show?

1. AOrganisms in a food web depend on each other
2. BWolves compete with trees for sunlight
3. CDeer are producers in the food web
4. DRemoving a predator has no effect on plants