Humans have two sex chromosomes that are named based on their shape. Males have (an) ________ and females have (an) ________.
A. two X chromosomes; X and Y chromosome
B. two X chromosomes; two Y chromosomes
C. X and Y chromosome; two X chromosomes
D. two Y chromosomes; two X chromosomes
Answer: C
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Where would you expect to find proteins responsible for controlling the substances that enter and leave mitochondria?
a. plasma membrane of the cell b. inner mitochondrial membrane
c. outer mitochondrial membrane d. nuclear membrane e. lysosomal membrane
Which organ system delivers nutrients and
oxygen to the cells?
a. respiratory b. urinary c. digestive d. lymphatic e. circulatory
What is the function of the high temperature step in PCR (polymerase chain reaction)?
A) activation of the DNA polymerase B) allowing primers to bind complementary sequences C) facilitate DNA synthesis D) deactivate DNA polymerase to pause synthesis E) break hydrogen bonds for strand separation
Stem cell lines are developed from ________
A) inner cell mass cells from a blastocyst B) multipotent cells C) cells collected from umbilical cords D) cells collected from amniotic fluid