Textbook Question
The type of fracture that occurs in osteoporosis:
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Ch. 3 Cells: The Living Units
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
Chapter 3, Problem 13
If DNA has a sequence of AAA, then a segment of mRNA synthesized on it will have a sequence of:
a. TTT
b. UUU
c. GGG
d. CCC
Verified step by step guidance1
Understand that during transcription, mRNA is synthesized using the DNA template strand by complementary base pairing, where adenine (A) in DNA pairs with uracil (U) in RNA, thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C).
Identify the given DNA sequence: AAA. This means the DNA template strand has three adenine bases in a row.
Apply the base pairing rules to find the complementary mRNA sequence: each adenine (A) in DNA pairs with uracil (U) in mRNA.
Write the mRNA sequence by replacing each A in the DNA with U in the mRNA, resulting in UUU.
Compare the mRNA sequence to the answer choices and select the one that matches the sequence UUU.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
DNA to mRNA Transcription
Transcription is the process where an mRNA strand is synthesized from a DNA template. During this process, RNA polymerase reads the DNA sequence and creates a complementary RNA strand, replacing thymine (T) with uracil (U) in RNA.
Recommended video:
04:01
1) Elongation of Transcription
Base Pairing Rules in Transcription
In transcription, adenine (A) in DNA pairs with uracil (U) in mRNA, thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C). This ensures the mRNA sequence is complementary to the DNA template.
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07:44Overview of Transcription
Role of Uracil in RNA
RNA contains uracil (U) instead of thymine (T), which is found in DNA. This difference is crucial because during transcription, uracil pairs with adenine, allowing mRNA to carry the genetic code from DNA to the ribosome for protein synthesis.
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04:191) RNA Processing
Related Practice
Textbook Question
A physiologist observes that the concentration of sodium inside a cell is decidedly lower than that outside the cell. She also observes that there is a small leakage of sodium into the cell. What cellular process prevents the sodium concentration gradient from disappearing?
a. Osmosis
b. Diffusion
c. Primary active transport
d. Secondary active transport
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Textbook Question
A nerve cell and a lymphocyte are presumed to differ in their:
a. Specialized structure
b. Suppressed genes and embryonic history
c. Genetic information
d. a and b, e. a and c
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Textbook Question
Cells lining the trachea have whiplike motile extensions on their free surfaces. What are these extensions, what is their source, and what is their function?
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Textbook Question
The RNA species that travels from the nucleus to the cytoplasm carrying the coded message specifying the sequence of amino acids in the protein to be made is
a. mRNA
b. tRNA
c. rRNA
d. all of these
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Textbook Question
A pancreas cell makes proteins (enzymes) that it releases to the small intestine. Which of the following best describes the path of these proteins from synthesis to exocytosis at the pancreatic cell's plasma membrane (PM)? a. Golgi → rough ER → PM, b. smooth ER → Golgi → lysosome → PM, c. rough ER → Golgi → PM, d. nucleus → Golgi → PM.
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