The ___ takes up HDLs and uses them to make
___.
a. liver...bile
b. small intestine...bile
c. red bone marrow...platelets
d. yellow bone marrow...fat
e. liver...LDLs
A
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If nondisjunction occurs during meiosis I, ____
a. two gametes will be normal and two will be missing one chromosome b. two gametes will be normal and two will have one extra chromosome c. three gametes will be normal and one will have two extra chromosomes d. all gametes will be normal e. all gametes will be abnormal
Prenatal diagnosis techniques such as amniocentesis and chorionic villus sampling remove cells that
were produced by an embryo. These cells are then used
a. to treat diseases. b. for implantation to produce pregnancy. c. to develop embryonic stem cells. d. to test for the presence of mutant alleles or chromosomal alterations. e. for cloning.
What is the evolutionary advantage of bacteria producing restriction endonucleases?
A. These enzymes are a defensive measure of bacteria to defend themselves against invading DNA of bacteriophages. B. Bacteria use these enzymes to attack other bacteria and destroy their DNA. C. They make these enzymes for humans to use in manipulating DNA. D. Bacteria use these enzymes to repair their own mistakes made during DNA replication.
Natural selection favors bacteria that express only the genes whose products are needed by the cell.