What are some structural differences between the upper and lower epidermis of the leaf?
What will be an ideal response?
A leaf's upper epidermis, which receives the most direct sunlight, may secrete a thicker cuticle than the lower surface, which tends to be shaded. The lower surface usually has more stomata.
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Vasectomy causes sterility because ____
a. sperm is no longer produced b. sperm is unable to leave the testis c. sperm is unable to reach the vas deferens d. sperm is unable to reach the urethra e. semen is no longer produced
The term open reading frame (ORF) corresponds to the parts of genes called ____________________. Fill in the blank(s) with the appropriate word(s)
Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?
A. Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control. B. Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis. C. Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell. D. Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
Trait SpeciesABCDE111011210010310011411111511111600010The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which pair of species shares the greatest number of derived characters (synapomorphies)?
A. 1 and 4 B. 2 and 5 C. 4 and 5 D. 2 and 4 E. 3 and 4