The tight packing of chromatin into the chromosomes visible during nuclear division is possible due to links between
____ proteins.
a. Cdk
b. H1 histone
c. H3 histone
d. H4 histone
e. nonhistone
ANSWER: b
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Which of the following is an enzyme used in cloning that breaks covalent bonds?
A. DNA ligase B. restriction endonuclease C. reverse transcriptase D. DNA polymerase I E. polynucleotide kinase
Glucose moves through a protein transporter down its concentration gradient into the cell. This is an example of ____
a. diffusion b. endocytosis c. exocytosis d. osmosis e. facilitated diffusion
Explain how a hormone will trigger the signal transduction pathway in a plant.
What will be an ideal response?
Which of the following contributes to gas exchange in the human fetus?
A) the lower blood pH of the embryo B) the lack of turbulence in fetal blood C) the high oxygen levels maintained in the amniotic fluid by the placenta D) the stronger attraction, when compared to adult hemoglobin, that fetal hemoglobin has for oxygen