1.ง่าย
What is an ecosystem?
- AA single organism together with all of its organs and tissues
- BThe living things in an area and their non-living surroundings
- CThe weather in a particular region
- DAll the members of one species in an area
2.ง่าย
What does transfer RNA (tRNA) do?
- AIt joins two DNA strands together
- BIt brings amino acids to the ribosome
- CIt carries the code out of the nucleus
- DIt copies DNA in the nucleus
3.ง่าย
What is apoptosis?
- AFusion of two gametes
- BProgrammed cell death
- CUncontrolled cell division
- DDivision of the cytoplasm
4.ปานกลาง
What happens in the lytic cycle of a virus?
- AThe host cell makes antibodies against the virus
- BThe virus divides by binary fission outside the cell
- CThe virus makes many copies in the host cell, which then bursts
- DThe viral DNA joins the host DNA and stays inactive for a long time
5.ปานกลาง
A bone marrow transplant can treat some blood cancers. Why does it work?
- AThe transplant replaces the patient's bones
- BThe donor stem cells produce new, healthy blood cells
- CThe donor marrow contains antibiotics that kill cancer
- DThe donor red cells divide to make more red cells
6.ปานกลาง
In which part of the chloroplast do the light-dependent reactions happen?
- AIn the outer membrane
- BIn the stroma
- CIn the cell wall
- DIn the thylakoid membranes
7.ยาก
พ่อแม่ทั้งสองมีกรุ๊ปเลือด O ลูกของพวกเขามีกรุ๊ปเลือดใดได้
- Aทั้งสี่กรุ๊ปได้
- Bเฉพาะกรุ๊ป AB
- Cกรุ๊ป A หรือกรุ๊ป O
- Dเฉพาะกรุ๊ป O
8.ยาก
Plasmids with an ampicillin-resistance gene are mixed with bacteria, which are then spread on a plate containing ampicillin. Why do only a few colonies grow?
- AOnly the bacteria that took up the plasmid can survive
- BAll the bacteria die, and the colonies are fungi
- CThe plasmid kills the bacteria that do not grow
- DAmpicillin makes some bacteria take up the plasmid
เฉลย
- 1. B · The living things in an area and their non-living surroundings
- 2. B · It brings amino acids to the ribosome
- 3. B · Programmed cell death
- 4. C · The virus makes many copies in the host cell, which then bursts
- 5. B · The donor stem cells produce new, healthy blood cells
- 6. D · In the thylakoid membranes
- 7. D · เฉพาะกรุ๊ป O
- 8. A · Only the bacteria that took up the plasmid can survive
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