Bacteria are helpful to humans in many ways, including all of the following EXCEPT which one?
A) production of antibiotics
B) breakdown of raw sewage
C) digestion of cellulose in the human intestine
D) production of soy sauce
E) production of vitamins for the human body
C
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Which of the following is not involved in ensuring the accuracy of replication of a cell's genetic information?
A) redundancy of double-stranded DNA B) repair enzymes C) precision of replication machinery D) DNA polymerase proofreading mechanism E) restriction endonucleases
The only endocrine gland whose secretory function
is under direct control by sympathetic neurons is the a. pancreas. b. thyroid. c. adrenal medulla. d. thymus. e. testis.
The accompanying figure shows the results of comparative analyses of two clades: the horseshoe crabs, and the king crabs and hermit crabs. What can you conclude from these diagram?
A) Horseshoe crabs have been on the Earth for an unusually long time. B) King crabs appeared in the fossil record before horseshoe crabs did. C) Hermit crabs are much older than their fossil record reveals. D) Horseshoe crabs are as genetically divergent as king and hermit crabs, despite being far less morphologically diverse. E) Horseshoe crabs have not been subjected to significant stabilizing selection.
Which of the following could not be considered a secondary tissue?
a. xylem b. phloem c. epidermis d. periderm e. cork