Chapter 3- The Cellular Level of Organization (textbook questions)

Because they are embedded within the membrane, ion channels are examples of ________.

b. integral proteins

The diffusion of substances within a solution tends to move those substances ________ their ________ gradient.

d. down; concentration

Ion pumps and phagocytosis are both examples of ________.

c. active transport

Choose the answer that best completes the following analogy: Diffusion is to ________ as endocytosis is to ________.

b. osmosis; pinocytosis

Choose the term that best completes the following analogy: Cytoplasm is to cytosol as a swimming pool containing chlorine and flotation toys is to _____.

d. the water

The rough ER has its name due to what associated structures?

b. ribosomes

Which of the following is a function of the rough ER?

a. production of proteins

Which of the following is a feature common to all three components of the cytoskeleton?

c. they are all polymers of protein subunits

Which of the following organelles produces large quantities of ATP when both glucose and oxygen are available to the cell?

a. mitochondria

The nucleus and mitochondria share which of the following features?

b. a double cell membrane

Which of the following structures could be found within the nucleolus?

c. ribosomes

Which of the following sequences on a DNA molecule would be complementary to GCTTATAT?

c. CGAATATA

Place the following structures in order from least to most complex organization: chromatin, nucleosome, DNA, chromosome

a. DNA, nucleosome, chromatin, chromosome

Which of the following is part of the elongation step of DNA synthesis?

b. attaching complementary nucleotides to the template srtand

Which of the following is not a difference between DNA and RNA?

c. DNA contains alternating sugar-phosphate molecules whereas RNA does not contain sugars

Transcription and translation take place in the ________ and ________, respectively.

c. nucleolus; cytoplasm

How many "letters" of an RNA molecule, in sequence, does it take to provide the code for a single amino acid?

c. 3

Which of the following is not made out of RNA?

d. the intron

24. Which of the following phases is characterized by preparation for DNA synthesis?

b. G1

A mutation in the gene for a cyclin protein might result in which of the following?

d. any of the above

What is a primary function of tumor suppressor genes?

b. stop certain cells from dividing

Arrange the following terms in order of increasing specialization: oligopotency, pleuripotency, unipotency, multipotency.

d. pleuripotency, multipotency, oligopotency, unipotency

Which type of stem cell gives rise to red and white blood cells?

c. hematopoietic

29. What multipotent stem cells from children sometimes banked by parents?

c. cells from the umbilical cord and from baby teeth