The DNA of chromosomes is composed of two strands wound about each other in the shape of a ________
Fill in the blank(s) with correct word
double helix (or twisted ladder)
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IgE is the:
a. first antibody produced when an invading microorganism is initially encountered. b. antibody that is associated with various parasitic infections. c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes. d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.
It has been known for some time that fetal cells can be found in a pregnant woman’s bloodstream, sometimes years
after a pregnancy. A new technique has been developed that allows scientists to isolate these fetal cells from a pregnant woman’s blood. Why would this be a useful new tool for parents interested in genetic testing of their fetus?
What will be an ideal response?If a DNA molecule was a spiral staircase, what would the steps of the staircase be?
a. covalent bonds b. deoxyribose c. base pairs d. hydrogen bonds e. phosphate
Reverse transcriptase synthesizes
A. a negative RNA strand from a positive RNA strand. B. viral RNA from DNA. C. viral DNA from RNA. D. a positive RNA strand from a negative RNA strand.