Although the placenta acts as a filter for many harmful substances, some are able to pass from mother
to embryo. They include
a. alcohol.
b. toxins in cigarette smoke.
c. caffeine.
d. drugs.
e. all of these.
E
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Which plants resemble palm trees (but are not close relatives), and contain toxins that increase the risk of neurodegenerative disorders and cancer?
a. tree ferns b. conifers c. gnetophytes d. ginkos e. cycads
The heart, skeletal muscles, and blood vessels all contain muscle tissue.
Answer the following statement true (T) or false (F)
HIV attaches to T cell and macrophages by means of an interaction between gp120 and a(n) (antibody/CD4/gp41 ) receptor
What will be an ideal response?
Which of the following statements about gel-transfer hybridization (or Southern blotting) is false?
(a) This technique involves the transfer of DNA molecules from gel onto nitrocellulose paper or nylon paper. (b) In this technique, single-stranded DNA is separated by electrophoresis. (c) A labeled DNA probe binds to the DNA by hybridization. (d) The DNA that is separated on a gel is not labeled.