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Biology Final - Test #2
Terms in this set (29)
RNA is extremely versatile and was likely the first genetic material of the earliest proto-cells and first cells on earth. List 2 roles of RNA that were important to the origins of early life.
Copy genetic information
Give one example of a disease/illness that is caused by each of the following: virus, bacteria, protist.
Bacteria: Strep throat
What is the relationship between the three domains on earth?
Eukarya are more closely related to Archaea than to Bacteria.
Why are viral infections not treatable with antibiotics?
Viruses are not alive and rely on their host for cellular functions
What is true of all protists?
They are not plants, animals, or fungi
They have eukaryotic cells
They can be unicellular or multicellular
They have a diversity of cell wall or cell coating materials including calcium carbonate and silica
Prior to the evolution of photosynthetic organism on earth, what molecule was missing in earth's earl atmosphere?
What is the correct rank of these items from smallest to largest: virus, eukaryotic cell, prokaryotic cell?
Virus, prokaryotic cell, eukaryotic cell
Nearly all plants that grow in soil have a symbiotic mutualistic relationship with fungi called __________ that assist the plant in the uptake of _______.
Minerals and water
What adaptation, unique to angiosperms, is used for paper and textile production?
The vascular cambium forms between which tissues?
Xylem and phloem
What is true regarding secondary growth in plants?
Secondary xylem builds up over time in rings, and becomes wood
A student examining leaf cross sections finds many tightly packed cells with relatively thin cell walls. The cells are alive, form part of the ground tissue system, make up most of the leaf volume, and have numerous chloroplasts for photosynthesis. What type of cells are these?
Alive or not: parenchyma, xylem, phloem, sclerenchyma, collenchyma
You find a plant with eight petals per flower and netted leaf veins. It is a ___________.
Different types of leaves?
Which of the following have pollen: seedless vascular plants, gymnosperms, angiosperms?
In a 10 year old woody eudicot plant that undergoes secondary growth, which tissue is actively involved in water and mineral transport?
The most recently produced (newest) secondary xylem
If you hammered a metal spike into a young, woody eudicot tree at a location one meter off he ground before leaving home for college, at what approximate height will the spike be when you return home 10 years later?
The metal spike will be at the same height as when you left but the trunk's outer layers may have grown around it a bit
What kind of tissue is the cork cambium and what it its role?
Lateral meristem - gives rise to cork, which is a secondary dermal tissue
The plant you bought in your freshman year of college is still alive and thriving 4 years later. The plant has tripled its mass, but the soft mass has hardly changed at all over this time. The plant's weight gain is mainly due to the addition of atoms of which molecule?
Carbon dioxide in the air
Carnivory in plants is an adaptation for obtaining what limiting macronutrient?
How are sperm delivered to the egg at fetilization in flowering angiosperms?
They travel through a pollen tube into the embryo sac.
After fertilization of the egg and polar nuclei, the angiosperm seed is formed from which structure?
Haploid plant structures that produce gametes
Angiosperm microspores mature into
What part of an angiosperm plant becomes the fruit?
What are nitrogen-fixing bacteria and how are they beneficial or harmful to most plants?
Symbiotic bacteria in the root nodules of legumes and in the soil itself that assist plants by converting unusable atmospheric nitrogen (N2) into sources that plants can utilize and uptake into their roots
Transpiration (evaporation out of stomata) causes the movement of water and minerals through the xylem. Which of the following will decrease (slow down) transpiration rates in plants during the day?
An increase in humidity, such as rainy weather
Which is not true of the phloem?
A. It uses pressure to push sugars from source to sink
B. Water is sucked into the phloem at the source due to high sucrose (solute) levels there
C. Phloem moves sugars from the roots to the shoots, one way flow only
D. Phloem cells are alive at maturity, unlike xylem cells
Not true - C. Phloem moves sugars from the roots to the shoots, one way flow only
*Phloem - two way flow
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