Biology Ch. 5

It is made up of two chromatids.

Which statement describes the chromosome shown in Figure?

Which of the following is an example of an internal factor that controls the cell cycle? a. growth factor b. kinase c. cell-cell contact d. erythropoietin

b. kinase

Which of the following reproduce asexually through mitosis? a. many multicellular eukaryotes b. most unicellular prokaryotes c. only unicellular eukaryotes d. some multicellular and unicellular eukaryotes

d. some multicellular and unicellular eukaryotes

Which organism is capable of reproduction through asexual mitosis? a. horse c. bacterium b. oak tree d. starfish

d. starfish

A hormone present in the blood can stimulate the growth of certain cells. The hormone is acting as a(n)

external factor.

Why do the cells lining the stomach divide more quickly than those in the liver?

They undergo more wear and tear.

Which statement about the process of binary fission is true? a. It does not involve the division of cytoplasm. b. It does not require any duplication of DNA. c. It does not take place in multicellular organisms. d. It does not produce genetically identical offspring.

c. It does not take place in multicellular organisms.

Which of the following is true of malignant tumors? a. They do not require treatment. b. They are easily removed through surgery. c. They can cause tumors in other parts of the body. d. They contain cells that stay clustered together.

c. They can cause tumors in other parts of the body.

Before a cell can move from the G1 or G2 stage to the next stage of the cell cycle, it must grow and

pass a critical checkpoint.

Before a cell can proceed to mitosis from the gap 2 stage of the cell cycle, it must

pass a critical checkpoint.

In a single-celled organism, mitosis is used for

reproduction

In vertebrates, differentiation of cells is influenced by

where the cells migrate.

What does a cell make during the synthesis stage of the cell cycle?

a copy of DNA

Proteins from outside a cell that stimulate it to divide are called

growth factors.

During which stage does the cytoplasm of a cell divide?

mitosis

Multicellular organisms use mitosis for growth, development, and

repair.

Offspring that are genetically unique are the result of

sexual reproduction.

Cells in a developing embryo differentiate based on

their location in the embryo

Which phrase best describes fragmentation? a. parent organism produces eggs and sperm, which form a new organism. b. parent organism sends off runner that grows into new organism. c. parent organism splits into pieces, each of which forms a new organism. d. parent organism sprouts projection that becomes new organism.

c. parent organism splits into pieces, each of which forms a new organism.

If a tumor is malignant, then cancer cells from the tumor

can form more tumors.

One difference between a cancer cell and a normal cell is that

cancer cells can divide in the absence of growth factors.

If a cell cannot move enough material through its membrane to survive, then the ratio of its surface area to volume is

too small.

A plant's leaf consists of

various types of tissue

One difference between a cancer cell and a normal cell is that

cancer cells divide uncontrollably.

Kinases and cyclins are internal factors that

control the cell cycle

During interphase a cell grows, duplicates organelles, and

copies DNA.

Molecules that control the stages of the cell cycle in all eukaryotes are similar. This fact suggests that

eukaryotes share a common ancestry.

The gap 1, gap 2, and synthesis stages of the cell cycle make up

interphase.