Lembar kerja Biologi untuk ujian masuk keperawatan dengan jawaban

What does the enzyme DNA ligase do?

1. AIt joins pieces of DNA together
2. BIt unwinds the DNA double helix
3. CIt cuts DNA at specific sites
4. DIt makes RNA from a DNA template

What does DNA replication produce?

1. AOne mRNA molecule
2. BTwo identical DNA molecules
3. CA new protein
4. DFour different DNA molecules

Which type of microscope is needed to see a virus?

1. AAn electron microscope
2. BA dissecting microscope
3. CA light microscope
4. DA magnifying glass

What is the role of cholesterol in animal cell membranes?

1. AIt keeps membrane fluidity stable as temperature changes
2. BIt forms a rigid wall around the cell
3. CIt carries glucose molecules across the membrane into the cell
4. DIt stores the cell's genetic information

Nerve cells release chemical messengers (neurotransmitters) stored in vesicles. By which process are they released?

1. AEndocytosis
2. BOsmosis
3. CPhagocytosis
4. DExocytosis

What are introns?

1. ANon-coding sections removed from pre-mRNA before translation
2. BShort pieces of DNA made on the lagging strand
3. CCoding sections joined together to form the mature mRNA
4. DCodons that tell the ribosome to stop translation

A single-celled microbe has a nucleus and a cell wall made of chitin, and it reproduces by budding. What is it most likely to be?

1. AAn amoeba
2. BA virus
3. CA yeast
4. DA bacterium

A dihybrid cross gives offspring in a ratio of about 9 : 3 : 3 : 1. What does this suggest?

1. ABoth parents are heterozygous for two genes that assort independently
2. BBoth parents are homozygous dominant for both genes
3. COne parent is AaBb and the other is homozygous aabb
4. DThe two genes are tightly linked on the same chromosome