Biology for nursing entrance exams worksheet with answers

What is true of a recessive allele?

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

What are the building blocks (monomers) of proteins?

1. AMonosaccharides
2. BFatty acids
3. CNucleotides
4. DAmino acids

What is the main job of the cell wall in a plant cell?

1. ATo release energy from glucose
2. BTo make proteins for the cell
3. CTo control which genes are switched on in the nucleus
4. DTo support the cell and stop it from bursting

In a eukaryotic cell, where does transcription take place?

1. AIn the Golgi apparatus
2. BOn ribosomes in the cytoplasm
3. CIn the nucleus
4. DIn the lysosomes

When plotting the results of an experiment, which variable usually goes on the y-axis?

1. AThe controlled variable
2. BThe dependent variable
3. CThe time the experiment started
4. DThe independent variable

Which sequence describes the usual flow of genetic information in a cell?

1. AProtein to RNA to DNA
2. BDNA to RNA to protein
3. CDNA to protein to RNA
4. DRNA to DNA to protein

Ignoring crossing over, how many different combinations of chromosomes can one person's gametes have because of independent assortment?

1. A2²³, about 8 million
2. B23², about 529
3. C46, one for each chromosome
4. D2 × 23, which is 46

Which parent's gamete decides the biological sex of a human baby, and why?

1. ABoth equally, because each gives one Y chromosome
2. BThe mother's, because an egg carries either an X or a Y
3. CThe father's, because a sperm carries either an X or a Y
4. DThe mother's, because she gives two X chromosomes