1.ง่าย
เบสใดพบในอาร์เอ็นเอแต่ไม่พบในดีเอ็นเอ
- Aยูราซิล
- Bกัวนีน
- Cอะดีนีน
- Dไทมีน
2.ง่าย
What is the SI base unit of mass?
- APound
- BGram
- CKilogram
- DLitre
3.ง่าย
หน่วยใดใช้บอกขนาดของเซลล์บ่อยที่สุด
- Aเมตร (m)
- Bลิตร (L)
- Cไมโครเมตร
- Dกิโลเมตร (km)
4.ปานกลาง
Which list puts these human energy sources in order from fastest to use to longest-lasting store?
- AFat, then glycogen, then ATP
- BATP, then fat, then glycogen
- CGlycogen, then ATP, then fat
- DATP, then glycogen, then fat
5.ปานกลาง
Why does ice float on liquid water?
- AIce molecules are lighter than liquid water molecules
- BIce contains more air than liquid water
- CHydrogen bonds hold ice in an open, less dense structure
- DIce is denser than liquid water
6.ปานกลาง
Why are stains such as iodine or methylene blue added to cells on a microscope slide?
- ATo keep the cells alive for longer
- BTo make the cells larger
- CTo make the cells divide
- DTo make structures easier to see
7.ยาก
In the Hershey–Chase experiment, viruses were labelled with radioactive phosphorus in their DNA or radioactive sulfur in their protein. Only the phosphorus entered the infected bacteria. What did this show?
- AProtein, not DNA, is the genetic material of the virus
- BDNA, not protein, is the genetic material of the virus
- CViruses contain no DNA at all
- DBacteria take up any radioactive substance
8.ยาก
Two parents are both AaBbCc, and the three genes assort independently. What is the probability that a child is aabbcc?
- A1/16
- B1/8
- C3/64
- D1/64
เฉลย
- 1. A · ยูราซิล
- 2. C · Kilogram
- 3. C · ไมโครเมตร
- 4. D · ATP, then glycogen, then fat
- 5. C · Hydrogen bonds hold ice in an open, less dense structure
- 6. D · To make structures easier to see
- 7. B · DNA, not protein, is the genetic material of the virus
- 8. D · 1/64
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