ใบงาน ชีววิทยาสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the main role of carbohydrates in the human diet?

1. ATo carry the body's genetic information
2. BTo form antibodies
3. CTo provide a quick source of energy
4. DTo build muscle tissue

What is true of a recessive allele?

1. AIts trait shows whenever one copy is present
2. BIt is always harmful to the organism
3. CIts trait shows only when two copies are present
4. DIt is found only on the X chromosome

What is a chromosomal deletion?

1. AThe swap of a single DNA base
2. BThe loss of a piece of a chromosome
3. CAn extra copy of a whole chromosome
4. DA piece of chromosome that is turned around

A tall pea plant could be TT or Tt. Which cross will best reveal its genotype?

1. ACross it with another tall plant
2. BLet it grow for a longer time
3. CCross it with a TT plant
4. DCross it with a short (tt) plant

In which part of the chloroplast do the light-dependent reactions happen?

1. AIn the cell wall
2. BIn the thylakoid membranes
3. CIn the stroma
4. DIn the outer membrane

Why does ice float on liquid water?

1. AIce is denser than liquid water
2. BIce molecules are lighter than liquid water molecules
3. CIce contains more air than liquid water
4. DHydrogen bonds hold ice in an open, less dense structure

HIV infects and destroys helper T cells. Why do people with untreated advanced HIV get infections that healthy people rarely get?

1. ATheir immune response is too weak to control normally harmless microbes
2. BThe virus turns harmless microbes into pathogens
3. CHIV kills the normal flora of the skin and gut
4. DHelper T cells make the antibiotics that the body needs to fight infection

Home pregnancy tests use antibodies that bind the hormone hCG. Why do they react with hCG and not with other proteins in urine?

1. AEach antibody binds a specific antigen shape
2. BUrine contains no other proteins at all
3. CAntibodies bind every protein but change colour only with hCG
4. DThe hormone hCG is a type of antibody itself