Cell Cycle

During interphase a cell grows, duplicates organelles, and

• replicates DNA

• divides the nucleus

• divides the cytoplasm

• produces a new cell

During which phase does a cell divide?

• G1

• S

• G2

• M

What are duplicated chromosomes made of?

• two histones

• two sister chromatids

• two centromeres

• two telomeres

In a single celled organism, mitosis is used for

• development

• reproduction

• growth

• repair

Which organism is capapble of reproduction through mitosis?

• dog

• pine tree

• starfish

During what phase does crossing over occur?

• prophase I

• anaphase II

• telophase I

• metaphase II

How many chromosomes are in a human gamete?

• 46

• 23

• 44

• 26

A liver cell is what type of cell?

• sex cell

• germ cell

• somatic cell

• haploid cell

What happens to sex cells during fertilization?

• they retain half their chromosomes

• half the cells copy their DNA

• their nuclei fuse to form one nucleus

• one becomes an egg and the other becomes a sperm cell

Which phrase best describes Meiosis I?

• duplication of chromosomes

• fusion of chromatids

• division of homologous chromosomes

• creation of diploid cells