If a characteristic is sex-linked , it
a. occurs most commonly in males
b. occurs only in females
c. is always fatal
d. can never occur in females
Ans: a. occurs most commonly in males
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A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid influences the movement of potassium ions out of the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
All things on Earth are made up of ________, which is defined as anything that has mass and occupies space
Fill in the blank(s) with correct word
You discover a green, filamentous multicellular eukaryote growing at the edge of a pond. How could you determine if the organism is a green alga or a plant?
a. Determine if the organism protects and nourishes its embryos. b. Determine if the organism protects its zygotes. c. Examine the cell walls to see if they are composed of cellulose. d. See if the organism stores its excess carbohydrates in the form of starch. e. Test for the presence of chlorophylls
After DNA replication, each chromosome contains two sister _____
a. chromatids b. chromatins c. chromosomes d. centromeres e. centrioles