Considering that virtually all cells in any given individual contain the same genetic information, how is it possible to
have different cell types with unique functions?
a. Gene expression is regulated such that different cell types produce different proteins.
b. All cells express all proteins encoded in an organism’s genes, but turn them on selectively.
c. Gene expression is regulated based on the age of the organism.
d. Only some cell types make protein products, while others do not.
e. Cells lose unneeded genes with each cell division.
a
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Imagine that a DNA sequence of 5'-A-C-G-T-A-C-G-T-3' is altered to 5'-A-C-G-C-A-C-G-T-3'. This could happen as a result of a(n)
A) inversion. B) deletion mutation. C) insertion mutation. D) translocation. E) nucleotide substitution mutation.
Acid-fast staining was performed on a sputum sample from a patient exhibiting clinical signs of Tuberculosis, red cells were observed on the slide. What can be determined from this slide?
A) The sample contained endospore forming bacteria B) The sample contained non-acid-fast cells, suggestive of members of the genus Mycobacterium C) The sample contained bacteria with mycolic acid in their cell walls, suggestive of members of the genus Mycobacterium
The role of a control in an experiment is to
A) provide a basis of comparison to the experimental group. B) prove that a hypothesis is correct. C) ensure repeatability.
Which of the following helps direct the formation of the primitive streak but contributes no cells to the embryo?
A) endoderm B) mesoderm C) ectoderm D) neural crest E) hypoblast