An important source of vitamin K in the intestine comes from which species?
A) Helicobacter pylori
B) Streptococcus mutans
C) Vibrio cholerae
D) Giardia lamblia
E) Escherichia coli
Answer: E
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A circular molecule of DNA devoid of any histone proteins describes the chromosome of a (an):
A. protozoa B. yeasts C. insects D. flowering plants E. bacteria
What do enzyme-linked receptors and growth factor receptors have in common?
A. Both act as transcriptional factors. B. Both possess kinase activity when bound to a hormone. C. Both regulate the transport of ions through channels. D. Both regulate specific G proteins when bound to a hormone. E. Both seldom affect the expression of genes within the nucleus.
In land plants, what is the waterproof covering on the leaves and stems called?
a. stomata b. stroma c. cuticle d. pellicle
The central nervous system of vertebrate animals consists of
A. all nerves in the body. B. the spinal cord. C. the brain. D. the brain and spinal cord. E. nerves originating at sensory receptors.