The first genetic material on Earth was most likely
Which organism appeared first on Earth?
Plant spores are
Moss is a
In seedless vascular plants which generation is dominant?
In angiosperms the, ___________ becomes the fruit
Ferns first appeared approximately
Flowering plants first appeared approximately
The photosynthetic cells of a plant are
In plants, spores are formed by
That new flu strain is H7N9. The N gene is a gene that
Helps the virus get OUT of the host cell
Area A has a water potential of 0.23 MPa. Area B has a water potential of 0.32MPa. Where will water be going?
From area A to area B
The FIRST plant group to have pollen was the
What is the correct sequence of events in the origin of life?
Synthesis of organic monomers, synthesis of organic polymers, formation of protobionts, formation of DNA-based genetic systems
Resemble structures formed by bacterial communities that are found today in some warm, shallow salty bays
At approximately what time in Earth's history did oxygen become abundant in the atmosphere for the first time?
2.3 billion years ago
Which of the following was not a challenge for survival for the first land plants?
Which of the following is true for the life cycle of mosses
Antheridia and Archegonia are produced by gametophytes
Spores develop into
In which of the following taxa does the mature sporophyte depend completely on the gametophyte for nutrition?
A botanist discovers a new species of plant in a tropical rain forest. After observing its anatomy and life cycle, he notes the following characteristics: flagellated sperm, xylem with tracheids, separate gametophyte and sporophyte generations with the sporophyte dominant, and no seeds. The plant is probably most closely related to
Evidence indicates that plants increase the number of stomata in their leaves as atmospheric CO2 levels decline. Increasing the number of stomata per unit surface area should have the effect of doing which of the following?
increasing dehydration of leaf tissues, countering the effect of declining CO2 on photosynthesis, increasing the O2 content of air next to the leaves higher than it would be otherwise
In addition to seeds, which of the following characteristics are unique to the seed-producing plants?
Which of the following can be found in gymnopsperms?
Angiosperm double fertilization is so-called because it features the formation of
one embryo involving one sperm cell and an endosperm involving a second sperm cell
Which of the following are structures of angiosperm gametophytes?
How have fruits contributed to the success of angiosperms?
by facilitating dispersal of seeds
Which of the following flower parts develop into a seed?
Which of the following would Professor Stevens consider a seedless vascular plant?
On the picture, D is the
B is the
AC is the
AC and AB are part of the
Plants contain meristems whose major function is to
produce more cells
Which of the following is a true statement about growth in plants?
some plants lack secondary growth
What would be a plant adaption that increases exposure of a plant to light in a dense forest?
In the above diagram C is the
F is the
Which of the following cells or tissues arise from lateral meristem activity?
Which of the following is a true statement?
Secondary growth is produced by both the vascular cambium and the cork cambium
What tissue makes up most of the wood of a tree?
If you drive a nail in the trunk of a young tree that is 3 meters tall, and the nail is about 1.5 meters from the ground, how many meters above the ground is the nail fifty years later?
An open beaker of pure water has a potential of
The value for potential in root tissue was found to be -0.15MPa. If you take the root tissue and place it in a 0.1M solution of sucrose (potential=-0.23MPa), the net water flow would
be from the tissue into the sucrose solution
Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will
have a faster rate of osmosis
What drives the flow of water through the xylem?
the evaporation of water from the leaves
What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
evaporation of water through stoma
What is responsible for the cohesion of water molecules?
hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule
An outer and an inner phospholipid bilayer is a characteristic of
gram negative bacteria
Bacterial chromosomes are
Bacteria can survive long periods of stress by forming
Approximately 8-9% of your DNA is
On the diagram, the group circled, which includes species B and species C, wold be
On the diagram, if I made a group of species A,B,C, and D, it would be
Professor Stevens is a member of Phylum Chordata. If I wanted to know more about him, the next more specific category in the old fashioned Linnaean system would be...
The scientific name of the red salamander is Pseudotriton ruber. Pseudotrition is the organsim's
This is when bacteria take in foreign DNA
For bacteria to share genes with other bacteria, they need the
To open a stomata, a cell will
pump K into the cell
When a guard cell is __________, the stomata will open
These organisms invented photosynthesis
The organism that causes Toxoplasmosis is a(n)
The most recent ancestor of animals is the