The ____ phylum has about 550 known living species of vascular, seed-bearing plants, the most among gymnosperms
Many of them have needlelike leaves with thick cuticles and sunken stomata, and are thus adapted to dry conditions.
a. Cycadophyta
b. Anthophyta
c. Gnetophyta
d. Coniferophyta
e. Ginkgophyta
ANSWER: d
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As a result of the hormonal and neuroanatomical differences between the male and female brains of zebra finches,
____.
a. only males sing their species songs b. only females sing their species songs c. males sing their species songs at earlier ages than females d. females sing their species songs at earlier ages than males e. females only sing their species songs later in their lives
Which description applies to individuals who are well adapted for a particular environment?
A) They may or may not be equally fit in another environment. B) They are the best fit for all other environments. C) They are at a disadvantage in other environments. D) They will mutate to become fit in other environments.
Which of the following statements is INCORRECT?
a. Langerhans cells activate the immune system. b. Tactile cells anchor the skin to the body. c. Keratinocytes produce a fibrous protein to protect the epidermis. d. Melanin provides protection against ultraviolet (UV) radiation.
Rifamicin
A) inhibits RNA synthesis B) inhibits nucleic acid synthesis C) disrupts cell membrane function D) acts as an antimetabolite