3rd Nine Weeks Exam 2025

The ligand and receptor are designed so that they

• cancel each other out.

• fit together.

• destroy each other.

• do not fit together.

Using the punnett square, what is a possible GENOTYPE?

• Tall

• Short

• Tt

• none of these

Which of the following is homozygous dominant?

• Jj
• Rr
• MM
• ee

If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?

• 100% Tt
• 50% Tt, 50% tt
• 75%Tt, 25%tt
• 25%TT, 50%Tt, 25%tt

The signal molecule in cell communication is also known as the

• ligand

• protein

• lipid

• carbohydrate

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?

• rr
• R
• RR
• RR or Rr

If tumor cells do not create their own blood supply and they do not have the ability to break off for the tumor and spread to other areas, that tumor is called a _________ tumor.

• benign

• metastatic

• both of these

• none of these

Which of the following phase of the cell cycle is not a part of interphase?

• M

• S

• G₁

• G₂

How many letters does a genotype contain?

• 1
• 2
• 3
• 4

Mature nerve cells are incapable of cell division. These cells are probably in –

• G₁ phase

• The S phase

• G₂ phase

• Mitosis