Cells become progressively committed to specific patterns of gene activity and developmental fate through a process
known as:
a. morphogenesis.
b. determination.
c. cell differentiation.
d. pattern formation.
e. growth.
b
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Which of the following is associated with specific immune responses?
a. skin b. B cells c. macrophages d. complement proteins e. tears
The exchange of favors between genetically unrelated individuals, to the benefit of both, is termed ________
Fill in the blank(s) with correct word
Morphological or molecular characters shared by members of a clade are called ______
A) common ancestors B) paraphyletic groups C) homoplasys D) monophyletic groups E) synapomorphies
Often students are surprised after performing this exercise at the fact that the bacterial pellet was quite small, and yet they were able to see the DNA without the aid of magnification. Which of the following choices provides a good explanation as to why the amount of DNA may seem large?
A) In this procedure the DNA is replicated B) While in cells DNA is extremely compact within the double helix (supercoiled), the DNA isolated in this protocol is no longer compact C) DNA swells after it has been extracted from bacterial cells