In later chapters, you will learn more about the regulation of gene expression. One way to regulate gene expression is to make changes to the histone proteins to alter how tightly the DNA is coiled and wrapped. The more tightly coiled and wrapped a particular region of DNA is, the less likely it is that the genes in that region will be expressed. Bearing this in mind, how tightly do you think regions of heterochromatin are compacted?
A. Loosely
B. Moderately
C. Very tightly
D. Not at all
Answer: C
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Where are sperm formed?
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
Which of the following statements regarding the differences between mitosis and meiosis is false?
A) In meiosis four daughter cells are produced, whereas in mitosis two daughter cells are produced. B) In mitosis cytokinesis occurs once, whereas in meiosis cytokinesis occurs twice. C) Crossing over is a phenomenon that creates genetic diversity during mitosis.
Which of the following is both a hypersensitivity disorder and an autoimmune disorder?
A) anaphylaxis B) glomerulonephritis C) graft rejection D) hemolytic disease of the newborn E) rheumatoid arthritis
Small chromosomal duplications provide raw material for the addition of genes into a species' genome. These duplications create two or more copies of the same gene, where one or both of the genes can subsequently mutate. These genes are referred to as
A. transposable elements. B. duplicated chromosomes. C. sister chromatids. D. homologous genes. E. homologous chromosomes.