What is the structure labeled B in the accompanying figure?
a. cytoplasm
b. nucleoid
c. plasma membrane
d. capsule
e. pilus
ANSWER: b
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The fact that the ratio of human male to female births is nearly 1:1 demonstrates that
A. X and Y chromosomes demonstrate independent assortment. B. X and Y chromosomes demonstrate segregation and random fertilization. C. X and Y chromosomes are homologous. D. X and Y chromosomes determine sex. E. All of these choices are correct.
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. CAM photosynthesis fixes CO2 at night. B. Water evaporates at a higher rate than usual. C. Guard cells lose turgor, and the stomata close. D. Calcium ions are transported faster through the phloem. E. Oxygen is used by plants for photosynthesis.
The evolution of organisms in the three domains and four kingdoms is most accurately described by which sequence?
A. Protists to Prokaryotes to Fungi, from Fungi separately to Plants and Animals B. Prokaryotes to Protists to Plants, from Plants separately to both Animals and Fungi C. Prokaryotes to Protists, from Protists separately to Fungi, Plants, and Animals D. Prokaryotes to Fungi to Protists to Plants to Animals E. Prokaryotes to Protists, separately to Animals and Plants with Fungi a loss of plant photosynthesis
Which of the following is NOT a function of the hypothalamus?
A. balances the water balance in the body B. controls body temperature C. influences the blood pressure D. regulates appetite E. All are functions of the hypothalamus.