panOpen: The Cellular Level of Organization (Ch. 3)

_______________ is one of the three components of the cytoskeleton. a. intermediate filaments b. cartilage c. osteocytes d. free radicals

A

choose the term that best completes the following analogy: cytoplasm is to cytosol as a swimming pool containing chlorine and flotation toys is to ________. a. the water b. the flotation toys c. the chlorine d. the walls of the pool

A

which type of stem cell gives rise to red and white blood cells? a. hematopoietic b. mesenchymal c. epithelial d. endothelial

A

***proteins that are embedded within and extend across the phospholipid bilayer are called_____ proteins. a. peripheral b. integral c. catalytic d. cytoskeleton

B

how many "letters" of an RNA molecule, in sequence, does it take to provide the code for a single amino acid? a. 4 b. 3 c. 2 d. 1

B

ion pumps and phagocytosis are both examples of ________. a. facilitated diffusion b. active transport c. passive transport d. endocytosis

B

which of the following is not a difference between DNA and RNA? a. RNA is single stranded and DNA is double stranded b. DNA contains alternating sugar-phosphate molecules whereas RNA does not contain sugars c. DNA contains thymine whereas RNA contains uracil d. DNA contains deoxyribose and RNA contains ribose

B

***the portion of a phospholipid molecule in a cell membrane that is exposed to extracellular fluid is called the ___________. a. hydrophobic head b. hydrophobic tail c. hydrophilic head d. hydrophilic tail

C

***which of the following substances may require ATP for transportation across a cell membrane? a. glucose b. carbon dioxide c. potassium d. oxygen

C

***which of these is a major function of the plasma membrane? a. storing calcium ions b. generating ATP c. regulating the passage of molecules into and out of the cell d. providing genetic information

C

a stem cell that is _____________ is limited to becoming one of a few different types of cells. a. pluripotent b. totipotent c. oligopotent d. unipotent

C

what organelle is responsible for sorting, modifying, and shipping off the products that come from the rough ER? a. endoplasmic reticulum b. lysosome c. golgi apparatus d. mitochondrion

C

which of the following phases is characterized by preparation for DNA synthesis? a. S b. G2 c. G1 d. G0

C

during protein synthesis, what happens before RNA polymerase adds new nucleotides to the growing strand of RNA? a. b. c. RNA polymerase aligns the correct nucleic acid with its complementary base on the coding strand of DNA. d.

C`

during DNA transcription, initiation occurs at a particular sequence of nucleotides called the _____________. a. intron b. spliceosome c. initiator d. promoter

D

place the following structures in order from least to most complex organization: chromatin, nucleosome, DNA, chromosome. a. nucleosome, chromatin, DNA, chromosome b. DNA, chromatin, nucleosome, chromosome c. nucleosome, DNA, chromosome, chromatin d. DNA, nucleosome, chromatin, chromosome

D

what is a primary function of tumor suppressor genes? a. help oncogenes produce oncoproteins b. allow the cell to skip certain phases of the cell cycle c. stop all cells from dividing d. stop certain cells from dividing

D

which of the following is a function of the rough ER? a. regulation of intracellular calcium concentration b. synthesis of steroid hormones c. detoxification of certain substances d. production of proteins

D

what is the function of helicase during DNA replication? a. untwist and separate the two strands of DNA. b. bring in the correct bases to complement the template strand. c. add free nucleotides to the end of a chain of DNA. d. terminate DNA replication.

A

which of the following organelles produces large quantities of ATP when both glucose and oxygen are available to the cell? a. ER b. lysosomes c. peroxisomes d. mitochondria

D

which of the following structures could be found within the nucleolus? a. chromatin b. histones c. nucleosomes d. ribosomes

D