What kind of trees dominate in ecosystems characterized by warm, wet climates with no distinct seasonality?
A) broadleaf evergreen
B) drought-deciduous
C) winter-deciduous
D) needle-leaf evergreen
A
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Answer the following statements true (T) or false (F)
1. One function of cell walls in plants is to prevent the continual increase in the expansion of the cell membrane. 2. The plant cell can move substances into cells using proton pumps that work against a gradient. 3. Diffusion of water across membranes occurs through channels formed by proteins known as aquaporins. 4. Active transport in plants works against a concentration gradient and this allows for substances to pass through plant cells without an energy input. 5. If your plants are wilted, this is an indication that the turgor pressure in cells of that plant are low.
Molecular/structural orientations (gradients) in an egg are thought to play a significant role in development. What is the origin of such gradients?
A) During early development, the nucleus is placed into position of the highest concentration. B) The side facing up has the lowest concentration of molecules. C) When an egg is fertilized, the gradient is set up based on the side of the egg on which the most mitochondria reside. D) During formation of the egg, nutritional as well as informational molecules (RNAs) are placed in appropriate positions for the development of the embryo. E) Where the sperm penetrated the egg is the area of highest concentration.
The ________ is a gland that often enlarges as a man ages, potentially causing problems with urination
Fill in the blank(s) with correct word
Which of the following mechanisms of genetic transfer was first observed by Lederberg and Tatum (1946) in Escherichia coli?
A. Transformation B. Transduction C. Conjugation D. All of the answers are correct