
Concept explainers
Figure 17.5 Which of the following statements about virus structure is true?
a. All viruses are encased in a viral membrane.
b. The capsomere is made up of small protein subunits called capsids.
c. DNA is the genetic material in all viruses.
d. Glycoproteins help the virus attach to the host cell.

Introduction:
Viruses have diversity in terms of the structure, the method of replication, host and target cells. Viruses are non-cellular and parasitic and do not have any internal organelles, metabolic process or plasma membrane. The virion consists of a nucleic acid core of either DNA or RNA, an outer coating of protein, or sometimes may have an outer membrane which is made up of phospholipid membrane which is derived from the host cell and proteins.
Answer to Problem 1ACQ
Correct answer:
The correct answer is option (d) Glycoproteins help the virus attach to the host cell.
Explanation of Solution
Explanation/justification for the correct answer:
Option (d) Glycoproteins help the virus attach to the host cell. All the virions have the nucleic acid genome which is covered with an outer protein protective layer is termed as capsid. Capsomere is small protein subunits that make up the capsid. The capsid of some of the viruses has a surrounding outer structure which is the viral envelope.
All the viruses contain some kind of the glycoprotein for attachment to the host cell molecules which are the viral receptors. These cell surface molecules are exploited by viruses for recognition and infection to particular types of cell. So, the correct answer is option (d).
Explanation for the incorrect answer:
Option (a) All viruses are encased in a viral membrane. Viruses may or may not have a viral membrane. So, this is an incorrect option.
Option (b) The capsomere is made up of small protein subunits called capsids Capsomere are small protein subunits that make up the capsid. So, this is an incorrect answer.
Option (c) DNA is the genetic material in all viruses. The virion consists of a nucleic acid core of either DNA or RNA. So, this is an incorrect answer.
All the viruses contain some kind of the glycoprotein for attachment to the host cell molecules which are the viral receptors. These cell surface molecules are exploited by viruses for recognition and infection to particular types of cell. Hence, the correct answer is option (d) Glycoproteins help the virus attach to the host cell.
Want to see more full solutions like this?
Chapter 17 Solutions
Concepts of Biology
Additional Science Textbook Solutions
Campbell Biology in Focus (2nd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
Microbiology with Diseases by Body System (5th Edition)
Biology: Life on Earth (11th Edition)
Anatomy & Physiology (6th Edition)
Chemistry: A Molecular Approach (4th Edition)
- When setting up a PCR reaction to act as a negative control for the surface protein A gene... Which primers will you add to the reaction mix? mecA primers, spa primers, mecA primers and spa primers, no primers What will you add in place of template? sterile water, MRSA DNA, Patient DNA, S. aureus DNAarrow_forwardDraft a science fair project for a 11 year old based on the human body, specifically the liverarrow_forwardYou generate a transgenic mouse line with a lox-stop-lox sequence upstream of a dominant-negative Notch fused to GFP. Upon crossing this mouse with another mouse line expressing ectoderm-specific Cre, what would you expect for the phenotype of neuronal differentiation in the resulting embryos?arrow_forward
- Hair follicle formation is thought to result from a reaction-diffusion mechanism with Wnt and its antagonist Dkk1. How is Dkk1 regulated by Wnt? Describe specific cis-regulatory elements and the net effect on Dkk1 expression.arrow_forwardLimetown S1E4 Transcript: E n 2025SP-BIO-111-PSNT1: Natu X Natural Selection in insects X + newconnect.mheducation.com/student/todo CA NATURAL SELECTION NATURAL SELECTION IN INSECTS (HARDY-WEINBERG LAW) INTRODUCTION LABORATORY SIMULATION A Lab Data Is this the correct allele frequency? Is this the correct genotype frequency? Is this the correct phenotype frequency? Total 1000 Phenotype Frequency Typica Carbonaria Allele Frequency 9 P 635 823 968 1118 1435 Color Initial Frequency Light 0.25 Dark 0.75 Frequency Gs 0.02 Allele Initial Allele Frequency Gs Allele Frequency d 0.50 0 D 0.50 0 Genotype Frequency Moths Genotype Color Moths Released Initial Frequency Frequency G5 Number of Moths Gs NC - Xarrow_forwardWhich of the following is not a sequence-specific DNA binding protein? 1. the catabolite-activated protein 2. the trp repressor protein 3. the flowering locus C protein 4. the flowering locus D protein 5. GAL4 6. all of the above are sequence-specific DNA binding proteinsarrow_forward
- Which of the following is not a DNA binding protein? 1. the lac repressor protein 2. the catabolite activated protein 3. the trp repressor protein 4. the flowering locus C protein 5. the flowering locus D protein 6. GAL4 7. all of the above are DNA binding proteinsarrow_forwardWhat symbolic and cultural behaviors are evident in the archaeological record and associated with Neandertals and anatomically modern humans in Europe beginning around 35,000 yBP (during the Upper Paleolithic)?arrow_forwardDescribe three cranial and postcranial features of Neanderthals skeletons that are likely adaptation to the cold climates of Upper Pleistocene Europe and explain how they are adaptations to a cold climate.arrow_forward
- Biology Questionarrow_forward✓ Details Draw a protein that is embedded in a membrane (a transmembrane protein), label the lipid bilayer and the protein. Identify the areas of the lipid bilayer that are hydrophobic and hydrophilic. Draw a membrane with two transporters: a proton pump transporter that uses ATP to generate a proton gradient, and a second transporter that moves glucose by secondary active transport (cartoon-like is ok). It will be important to show protons moving in the correct direction, and that the transporter that is powered by secondary active transport is logically related to the proton pump.arrow_forwarddrawing chemical structure of ATP. please draw in and label whats asked. Thank you.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning




