Which process is used to reduce the number of chromosomes from parent cell to daughter cell?
a) meiosis
b) mitosis
c) independent assortment
d) crossing over
Ans: a) meiosis
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Match the following items with the correct phrases.
_______1. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but greater quantities are found in the cell walls of Gram-positive bacteria. _______2. Found in the cell walls of algae, but not in the cell walls of other microorganisms. _______3. Found in the cell walls of Gram-positive bacteria, but not in the cell walls of Gram-negative bacteria. _______4. Found in the cell walls of fungi, but not in the cell walls of other microorganisms. _______5. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but not found in the cell walls of archaeans. a. cellulose b. chitin c. peptidoglycan d. teichoic acids
Natural selection acting on a population may NOT favor
a. individuals at the left end of the range of variation. b. individuals at the right end of the range. c. extreme individuals at both ends of the range. d. the intermediate individuals within the range. e. obligate asexually reproducing organisms.
The left ventricle in mammals is more muscular than the right ventricle because
A. the right ventricle only pumps blood into the right atrium. B. the left ventricle has to pump blood throughout the body at high pressure. C. the left ventricle pumps more total blood than the right ventricle. D. the left ventricle is always contracting to maintain a systemic blood pressure. E. the left ventricle pumps blood with a higher hematocrit than the blood that leaves the right ventricle. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the mammalian heart? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In mammals, X chromosome inactivation results in _____
a. a total inactivation of both female X chromosomes b. only the inactivation of the paternal X chromosome in females c. only the inactivation of the maternal X chromosome in females d. the random inactivation of either the paternal or the maternal X in females e. the inactivation of the maternal X chromosome in males