PCAT Biological 2

Question 1

Which enzyme is responsible for unwinding the DNA double helix during replication?

Accepted Answer

Helicase

Answer

DNA polymerase III

Answer

Primase

Answer

Ligase

Question 2

Which phase of meiosis results in the separation of homologous chromosomes?

Accepted Answer

Meiosis I Anaphase

Answer

Meiosis II Anaphase

Answer

Meiosis I Metaphase

Answer

Meiosis II Metaphase

Question 3

What is the primary function of the smooth endoplasmic reticulum?

Accepted Answer

Lipid synthesis and detoxification

Answer

Protein synthesis

Answer

Packaging proteins for secretion

Answer

DNA replication

Question 4

In a dihybrid cross between two AaBb parents, what fraction of offspring will be aabb?

Accepted Answer

1/16

Answer

1/4

Answer

1/8

Answer

3/16

Question 5

Which blood vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Answer

Pulmonary artery

Answer

Aorta

Answer

Superior vena cava

Question 6

Which type of RNA carries the genetic code from the nucleus to the ribosome?

Accepted Answer

mRNA

Answer

tRNA

Answer

rRNA

Answer

snRNA

Question 7

Which organelle is the primary site of ATP production via aerobic respiration?

Accepted Answer

Mitochondria

Answer

Nucleus

Answer

Lysosome

Answer

Golgi apparatus