Concept explainers
Introduction:
Genes are a functional unit of heredity. They are passed on from parent generation to the progenies. Genes consist of DNA sequences that pass on specific information regarding cellular functioning. Genes are responsible for the synthesis of different types of proteins that perform the required function in the body.
Answer to Problem 1SQ
Correct answer:
The expression of a gene may depend on the type of organism, environmental conditions, and the type of cell. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Option d. is given as “all of the above.”
Gene expression depends on the type of organism. Some genes (such as insulin coding genes) are active in only a few animal species. Specific types of cells secrete certain proteins. Some of the hormonal proteins are secreted under specific environmental conditions. Gene expression depends on various factors, such as the type of organism, cell type, and environmental conditions.
Reason for incorrect answer:
Option a. is given as, “the type of organism.”
Not all the genes are expressed in all the organisms. Expression of genes depends on the type of organisms. Along with this, certain specific genes are expressed only in specialized cells. This makes the expression of genes dependent on the type of cell as well. Hence, option a. is incorrect.
Option b. is given as, “environmental conditions.”
Genes coding for certain hormonal proteins are expressed under specific environmental conditions. Not all the hormones are secreted in all species. This also makes gene expression dependent on the type of organism. Hence, option b. is incorrect.
Option c. is given as, “type of cell.”
Some genes are secreted in specific types of cells, for example, oncogenes are active only in tumor cells. Under certain environmental conditions, also, particular genes are activated. Hence, option c. is incorrect.
Hence, the options a., b., and c. are incorrect.
The type of organism, environmental conditions, and the type of cell, all determines the expression of a gene in an organism. Thus, the correct option is d.
Want to see more full solutions like this?
Chapter 10 Solutions
Biology: Concepts and Applications (MindTap Course List)
- What are intrinsically disordered proteins, and how might they be useful for a living system?arrow_forwardWhat are Amyloid Fibrils? What biological functions are these known to perform?arrow_forwardHow do histamine and prostaglandins help in the mobilization of leukocytes to an injury site? What are chemotactic factors? How do they affect inflammation process?arrow_forward
- Compare and contrast neutrophils and macrophages. Describe two ways they are different and two ways they are similar.arrow_forwardDescribe the effects of three cytokines (not involved in the initial inflammation response). What cells release them?arrow_forwardDescribe activation of helper T cells or cytotoxic T cellsarrow_forward
- Compare and contrast MHC 1 and MHC 2. Describe two way they are different and two ways they similar including how they are used in antigen presentation.arrow_forwardDescribe two antimicrobial properties of the skin.arrow_forwardDescribe how the inflammation response starts including the sentinel cells and the chemicals involved. How do pathogens trigger the response particularly in the skin?arrow_forward
- How does complement promote the immune response? Describe three waysarrow_forwardWhich of the following is not a possible mechanism for autoimmunity? Select one: A. Abnormal expression of MHC II molecules in non-antigen-presenting cells B. Activation of polyclonal B cells C. Polymorphism of HLA alleles D. Molecular mimicry E. Release of sequestered antigensarrow_forwardWRITTEN WORK 3: NON-MENDELIAN GENETICS Part A: Complete the Punnett square and calculate for the probability of genotype and phenotype. i i Genotype: Phenotype: 08:55arrow_forward