BIOL 111 Lecture 13: Algae
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1.This week, you will be conducting Gram stains of bacteria.Which of the following statements are true? (Mark all thatapply)
Gram-negative bacteria do not stain purple because they do nottake-up crystal violet or iodine | ||
The peptidoglycan in the walls of Gram-positive bacteria bindsto the crystal violet stain more easily than walls of Gram-negativebacteria do | ||
Gram-positive bacteria have cell walls with a thickerpeptidoglycan layer than walls of Gram-negative bacteria | ||
Gram-negative bacteria do not stain purple, because their cellwall structure allows purple-colored iodine-dye complexes to washout of the cells more easily than the cell wall structure ofGram-positive bacteria does | ||
Gram-negative bacteria have an outer membrane (outside thepeptidoglycan layer in their wall) that Gram-positive bacterialack |
2.
What evidence is used to inform our understanding ofrelationships among species? (mark all that apply)
Biochemical similarities between existing species | ||
Fossils | ||
Morphological similarities between existing species (presence ofhair, backbones, etc.) | ||
DNA sequences and molecular clocks |
3.
For each of the groups of organisms below, indicate whether theybelong in (A.) Archaea, (B.) Bacteria, or (C.) Eukarya
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4.
Select all true statements about the relative diversity ofdifferent groups of organisms from among the followingstatements:
There are more species of plants on Earth than species ofmolluscs | ||
There are more plant species on Earth than mammal species | ||
There are more species of plants on Earth than species offungi | ||
There are more species of fungi on Earth than mammal species | ||
There are more species of plants on Earth than species ofarthropods | ||
There are more flatworm species on Earth than mammal species |
need help on a problem for my problem set, thanks inadvance!
You are studying the decomposition and mineralization from leaflitter in a forest. The litter has the followingcharacteristics:
Material | % of litter mass | C/N ratio |
Physiological material | 20 | 5 |
Cellulose | 60 | No N |
Lignin | 20 | No N |
Three groups of organisms decompose this material
Organism | C/N Ratio | Substrate Use Efficiency | They eat: |
Bacteria | 5 | 0.50 | Only physiological material |
Cellulytic fungi | 20 | 0.40 | Everything except lignin |
Lignolytic fungi | 20 | 0.25 | Everything |
Assume:
Growth rates:
A- Bacteria grow faster than fungi and have first crack at anymaterial that they can metabolize (physiological material and deadmicrobes).
B- Cellulytic fungi grow next fastest and will use resourcesthat bacteria donât.
C- Lignolytic fungi grow the slowest of all three groups (i.e.they have last crack at material).
D- Microbes will only process a material if they have thenitrogen they need to do so.
1. Given those assumptions, run calculations for the first cycleof decomposition. Calculate:
A-How much of each plant carbon pool is decomposed?
B-How much biomass of each group of microorganisms isproduced?
C-.Is any nitrogen mineralized? If so, how much?