You are looking at a sample from the top green layer of a colorful bacterial mat. Using phase contrast and fluorescence microscopy, you see evenly spaced cells in the middle of a filament that are slightly smaller than the others
The smaller cells are not fluorescent, indicating they lack photosystem II, but the rest of the filament is fluorescent. What type of filamentous bacteria are you most likely looking at?
A) purple nonsulfur bacteria
B) green sulfur bacteria
C) Acidobacteria
D) Cyanobacteria
Answer: D
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How many chromosomes are present in human somatic cells?
a. 22 b. 23 c. 44 d. 46 e. 48
Peptide hormones include
a. estrogens. b. growth hormone. c. melatonin. d. thyroid hormone. e. oxytocin.
What are the two chemical structures found in RNA but not DNA?
What will be an ideal response?
The basic categories of hormones are peptide or proteins, steroids, and aminoacid derivatives. The chemical properties of each hormone type determine someof its functional properties and how it must interact with receptors to signal to the cell.Is it likely that a small, hydrophilic hormone can cross the cell membrane?
A. Yes B. No