What is the importance of a cell being able to regulate gene expression?
What will be an ideal response?
Expression of genes when the proteins are not needed is wasteful to cells and can cause a cell to grow more slowly than its neighbors. Expression of genes at inappropriate times can interfere with normal development or cause cancer.
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The major histocompatability (MHC) molecule is important in a T cell's ability to _____
A) distinguish self from nonself B) recognize specific parasitic pathogens C) identify specific bacterial pathogens D) identify specific viruses E) recognize differences among types of cancer
When the SRY gene of the Y chromosome becomes active (around 7 weeks), the ____
a. Müllerian and Wolffian ducts both develop into male reproductive structures b. Müllerian ducts develop into male reproductive structures and the Wolffian ducts disappear c. Müllerian ducts disappear and the Wolffian ducts develop into male reproductive structures d. Müllerian and Wolffian ducts both disappear e. Müllerian and Wolffian ducts both develop into female reproductive structures
What is a fruit species that can be propagated by apomixis?
a. apple b. peach c. citrus d. pear e. peach
Biotechnology companies sell kits that allow you to do PCR to amplify STR regions from human blood samples that you have collected. What components would you expect to find in the kit in order to be able to do successful PCR reactions?
A) human DNA polymerase, primers that flank STR regions only B) heat-stable DNA polymerase, primers that flank STR regions only C) human DNA polymerase, primers that flank STR regions, free nucleotides D) heat-stable DNA polymerase, primers that flank STR regions, free nucleotides