Phiếu bài tập Sinh học cho kỳ thi đầu vào điều dưỡng có đáp án

What does transfer RNA (tRNA) do?

1. AIt carries the code out of the nucleus
2. BIt copies DNA in the nucleus
3. CIt joins two DNA strands together
4. DIt brings amino acids to the ribosome

Tế bào nhân sơ, như vi khuẩn, không có gì?

1. ANhân có màng bao bọc
2. BVật chất di truyền dưới dạng DNA
3. CMàng tế bào
4. DRibosome

What is a sister chromatid?

1. AOne of two identical copies of a chromosome joined at the centromere
2. BA chromosome that is inherited from the mother only, never the father
3. CA small ring of DNA found in bacteria
4. DOne of the two sex chromosomes

Many vitamins act as coenzymes. What does this mean?

1. AThey are built into the cell membrane
2. BThey are digested to release large amounts of energy
3. CThey help enzymes carry out their reactions
4. DThey replace enzymes that have been denatured

In evolution, what does an organism's fitness mean?

1. AHow strong and fast the organism is compared with others
2. BHow large the organism grows
3. CHow many offspring it leaves that survive and reproduce
4. DHow long the organism lives

What is the function of the pores in the nuclear envelope?

1. AThey let chromosomes leave the nucleus to be copied
2. BThey make ribosomal RNA for the cell
3. CThey let molecules such as mRNA pass in and out
4. DThey attach the nucleus to the cell membrane

Which statement correctly compares DNA replication and transcription?

1. ABoth take place on ribosomes in the cytoplasm
2. BReplication copies all the DNA; transcription copies one gene
3. CBoth use thymine and deoxyribose in the new strand
4. DReplication makes RNA from DNA; transcription makes DNA from RNA

In an onion root tip, 90 of 100 cells are in interphase and 10 are in mitosis. If the whole cell cycle takes 20 hours, about how long does mitosis last?

1. A18 hours
2. B0,5 hours
3. C10 hours
4. D2 hours