Why do heterotrophs require "food" for survival?
A) Food is an alternative source of energy for heterotrophs when sunlight is unavailable.
B) Heterotrophs cannot photosynthesize without the chemicals provided by food.
C) Food provides the organic chemicals needed by heterotrophs.
D) Food provides at least half of the water required by heterotrophs.
C
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The process by which pollen is transferred to the ovule is called
(a) transmigration. (b) fertilization. (c) pollination. (d) all of the above.
The complex of periplasmic flagella that mediates the movement of spirochetes is referred to as the ________.
A. axillary filament B. periplasmic flagella C. axial filament D. peritrichal axon E. periplasmic flagella or axial filament
A compound that contains both carbon and hydrogen is ____
a. a salt b. always an acid c. non-biological d. organic e. inorganic
Why have gene families evolved? Choose the most accurate answer for gene families in general
A) Although in some cases researchers have inferred that gene families are adaptive, gene families may also evolve due to genetic drift. B) Having multiple copies of a gene can increase transcription and translation of the gene, so when increased transcription is adaptive, then natural selection favors genes duplicating into gene families. C) Gene families are adaptive because each gene can produce a slightly different protein, which allows for diverse functions that are favored by natural selection. D) Gene families evolve because of the activity of mobile genetic elements, which cause repeated gene duplication events.