Question 1

All triplets required to code for synthesis of a protein are a

Accepted Answer

A)  gene.
B)  codon.
C)  proenzyme.
D)  pre-mRNA.
E)  ribosomal RNA (rRN
A)  .F) A) and D)
G) B) and D)

Question 2

Communication between cells occurs when chemical messengers from one cell bind to _____ on another cell.

Accepted Answer

A)  marker molecules
B)  second messengers
C)  channel proteins
D)  receptor proteins
E)  integrinsF) C) and D)
G) C) and E)

Question 3

Which of the following activities is a function of the plasma membrane?

Accepted Answer

A)  cell metabolism
B)  transport of products from the nucleus to the endoplasmic reticulum
C)  recognition of bacterial cells by the immune system
D)  digestion of unneeded cell organelles
E)  detoxificationF) A) and B)
G) C) and D)

Question 4

If the amino acid coding region of a mRNA molecule is 1800 nucleotides (bases) in length,this molecule will contain _____ codons.

Accepted Answer

A)  1200
B)  400
C)  900
D)  600
E)  800F) A) and E)
G) B) and E)

Question 5

Portions of pre-mRNA that do NOT code for parts of a protein are called

Accepted Answer

A)  introns.
B)  start codons.
C)  exons.
D)  stop codons.
E)  All of these except exons do not code for parts of a protein.F) C) and E)
G) A) and B)

Question 6

DNA replication results in two new DNA molecules.Each of these new molecules

Accepted Answer

A)  has one strand of nucleotides from the parent DNA and one newly synthesized strand of nucleotides.
B)  has two newly synthesized strands of nucleotides.
C)  has a single strand of nucleotides.
D)  are incomplete copies of the original.
E)  has two strands of nucleotides from the parent.F) A) and D)
G) A) and C)

Question 7

Skeletal muscle cells need large numbers of _______ to make the many proteins they contain.

Accepted Answer

A)  liposomes
B)  lysosomes
C)  centrosomes
D)  peroxisomes
E)  ribosomesF) A) and D)
G) B) and E)

Question 8

Which mature cells do not have a nucleus?

Accepted Answer

A)  columnar cells of small intestines
B)  columnar cells of upper respiratory tract
C)  spermatozoa
D)  macrophage (large,mobile white blood cell) 
E)  red blood cellsF) A) and B)
G) A) and C)

Exam 3: Cell Biology

Communication between cells occurs when chemical messengers from one cell bind to _____ on another cell.

Correct Answer
verified

If the amino acid coding region of a mRNA molecule is 1800 nucleotides (bases) in length,this molecule will contain _____ codons.

Correct Answer
verified

Skeletal muscle cells need large numbers of _______ to make the many proteins they contain.

Correct Answer
verified

Portions of pre-mRNA that do NOT code for parts of a protein are called

Correct Answer
verified

DNA replication results in two new DNA molecules.Each of these new molecules

Correct Answer
verified

Which mature cells do not have a nucleus?

Correct Answer
verified

Which of the following activities is a function of the plasma membrane?

Correct Answer
verified

All triplets required to code for synthesis of a protein are a

Correct Answer
verified

Exam 3: Cell Biology

Communication between cells occurs when chemical messengers from one cell bind to _____ on another cell.

Correct AnswerverifiedShow Answer

If the amino acid coding region of a mRNA molecule is 1800 nucleotides (bases) in length,this molecule will contain _____ codons.

Correct AnswerverifiedShow Answer

Skeletal muscle cells need large numbers of _______ to make the many proteins they contain.

Correct AnswerverifiedShow Answer

Portions of pre-mRNA that do NOT code for parts of a protein are called

Correct AnswerverifiedShow Answer

DNA replication results in two new DNA molecules.Each of these new molecules

Correct AnswerverifiedShow Answer

Which mature cells do not have a nucleus?

Correct AnswerverifiedShow Answer

Which of the following activities is a function of the plasma membrane?

Correct AnswerverifiedShow Answer

All triplets required to code for synthesis of a protein are a

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified