The phenotypic sex depends most directly on
A. the presence of a Y chromosome.
B. the presence of the number of active X chromosomes.
C. the development of the ovaries.
D. the influence of hormones.
E. the degeneration of the Müllerian duct.
D
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Which species represent an early stage in primary succession?
a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field d. ferns e. deciduous trees
Four of the four answers listed below are types
of complex plant tissue. Select the EXCEPTION.
a. sclerenchyma b. phloem c. xylem d. epidermis e. periderm
To establish itself in a host, a microbe must:
a. survive immune system defenses b. utilize a portal of entry c. be able to adhere to host tissue d. damage and destroy host tissue e. produce toxins and exoenzymes
Biological membranes contain bilayers containing mostly ________.
A. cholesterol B. oils C. phospholipids D. triglycerides E. prostaglandins