ใบงาน ชีววิทยาสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is homeostasis?

1. AMaking identical copies of a cell
2. BChanging a species over many generations
3. CKeeping a stable internal environment
4. DBreaking down food for energy

Which characteristic is shared by all living things?

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

สิ่งมีชีวิตมีจีโนไทป์ Bb จะเรียกว่าอะไร

1. Aโฮโมไซกัสเด่น
2. Bเฮเทอโรไซกัส
3. Cโฮโมไซกัสด้อย
4. Dแฮพลอยด์

Why do the palisade cells near the top surface of a leaf contain many chloroplasts?

1. AThey carry sugars from the leaves down to the roots
2. BThey store most of the plant's water for dry periods
3. CThey protect the leaf from insects and strong winds
4. DThey get the most light and do most of the photosynthesis

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA missense mutation
2. BA silent mutation
3. CA nonsense mutation
4. DA frameshift mutation

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

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

Why is one new DNA strand made in short pieces (Okazaki fragments) during replication?

1. ADNA polymerase works only 5' to 3', and the strands are antiparallel
2. BThe lagging strand is made of RNA instead of DNA, so it must be built in pieces
3. COnly half of the DNA needs to be copied
4. DHelicase cuts that strand into pieces before copying

Griffith injected mice with heat-killed harmful bacteria mixed with live harmless bacteria. The mice died, and live harmful bacteria were found in them. What did this show?

1. AThe mice were killed by the dead bacteria alone
2. BBacteria can be killed by the immune system of mice
3. CA substance from the dead bacteria changed the harmless ones
4. DHeat makes harmless bacteria become harmful when they are injected