Question 1

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) 800 
A) 1200 
B) 400 
C) 900 
D) 600 
E) 800

Question 2

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 cells 
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 cells

Question 3

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

Question 4

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. 
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.

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

Question 6

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) integrins 
A) marker molecules 
B) second messengers 
C) channel proteins 
D) receptor proteins 
E) integrins

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) ribosomes 
A) liposomes 
B) lysosomes 
C) centrosomes 
D) peroxisomes 
E) ribosomes

Question 8

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) detoxification 
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) detoxification

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

Which mature cells do not have a nucleus?

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

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

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

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

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

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

The Human Organism

The Chemical Basis of Life

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

Development,growth,aging,and Genetics

Filters

Exam 3: Cell Biology

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

Which mature cells do not have a nucleus?

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

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

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

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

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

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

The Human Organism

The Chemical Basis of Life

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

Development,growth,aging,and Genetics

Filters