What product(s) do plants produce during photosynthesis that is/are used by humans and other animals?
A) oxygen B) glucose and oxygen
C) carbon dioxide D) glucose
Answer: B
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The presence of Neisseria in a sample of cerebrospinal fluid indicates that
A. the patient is healthy; Neisseria is part of the normal biota. B. there is a deficiency in the patient's blood-brain barrier. C. the patient has previously had an infection with Neisseria. D. the patient has an infection with Neisseria.
Altering patterns of gene expression in prokaryotes would most likely serve an organism's survival by _____
A) organizing gene expression, so that genes are expressed in a given order B) allowing each gene to be expressed an equal number of times C) allowing an organism to adjust to changes in environmental conditions D) allowing young organisms to respond differently than more mature organisms E) allowing environmental changes to alter a prokaryote's genome
Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. B. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. D. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient.
Which organism possesses a three-chambered heart?
a. human b. amphibian c. arthropod d. bird e. fish