Steele HS Midterm Review 2020 #2

Cyclins are a family of closely related proteins that

• regulate the cell cycle.

• produce p 53.

• cause cancer.

• work to heal wounds.

Which of the following is a correct statement about the events of the cell cycle?

• Little happens during the G1 and G2 phases.

• DNA replicates during cytokinesis.

• The M phase is usually the longest phase.

• Interphase consists of the G1, S, and G2 phases.

Checkpoints occur between the stages of the cell cycle. If a cell does not meet certain criteria at the end of a stage, it will not move to the next stage.

Which of these occurs just before the cell enters the G2 stage of the cell cycle?

• The nuclear membrane disintegrates.

• The nucleolus divides.

• Centrioles form.

• DNA replicates.

People infected with the human immunodeficiency virus (HIV) have an increased risk of dying from secondary infections. Which of these best explains how HIV increases the danger of secondary infections?

• HIV produces antigens that damage red blood cells

• HIV adds genetic material from harmful microbes

• HIV destroys T cells

• HIV consumes beneficial microbes in the body

Which organelle is the powerplant of the cell that converts the chemical energy stored in food into ATP?

• chloroplast

• Golgi apparatus

• endoplasmic reticulum

• mitochondria

Which of the following can be found in both eukaryotic and prokaryotic cells?

• mitochondria

• nucleus

• genetic material (DNA)

• chloroplast

Name the structure labeled A

• mitochondria

• cytoplasm

• nucleus

• ribosome

There are four blood types: A, B, AB and O. The genes for both A and B types are dominant over O. What is the probability of a father with type O and a mother with type AB producing a child with blood type O?

• 0%

• 25%

• 75%

• 100%

A red flowered plant (RR) is crossed with a white flowered plant (WW) and produces plants with pink flowers (RW). If two pink flowered plants are crossed, what color offspring could be produced?

• Red, white and pink

• Red and white

• Pink and red

• Pink and white

Two plants with the genotypes TT and Tt –

• would have the same phenotype.

• would have different phenotypes.

• have all dominant alleles.

• have all recessive alleles.